High-orientation collector for lithium-ion battery, fabrication method therefor and application thereof

Abstract

Disclosed are a high-orientation collector for a lithium-ion battery, a manufacturing method therefor and an application thereof. The collector is made of a resin material added with conductive particles. The conductive particles of the collector in an X-Y direction do not form a sufficient conductive network, but form a good conductive network in a Z direction. While a short circuit occurs, the collector is not easy to activate most of active materials in the X-Y direction so that thermal runaway is not easy to occur, but the collector may fully conduct electricity in the Z direction so that the battery may be normally charged and discharged, thereby improving battery safety.

Claims

1. A collector, which is made of a resin material added with conductive particles, wherein in the collector, the conductive particles and the resin material are distributed at intervals, and in an X-Y direction, the number of the conductive particles forming a conductive path does not exceed 20% of the total number of the conductive particles; and in a Z direction, the number of the conductive particles forming the conductive path is not less than 60% of the total number of the conductive particles.

2. The collector according to claim 1, wherein the conductive particles comprise carbon material nanoparticles.

3. The collector according to claim 2, wherein the carbon material is selected from one or a combination of two or more of a carbon black, a ketjen black, a carbon nanotube, a graphene, a carbon fiber, and a VGCF.

4. The collector according to claim 3, wherein the particle size of the graphene is 5 nm- 100 nm; and the particle size of the carbon black and the ketjen black is 1 nm-100 nm; preferably, the carbon nanotube can be selected from a single-wall carbon nanotube or a multi-wall carbon nanotube, the diameter is 1 nm-5 nm, and the length is 10 nm-500 nm; and preferably, the diameter of the carbon fiber and VGCF is 80 nm-200 nm, BET is 5 m.sup.2/g-30 m.sup.2/g, and the length is 200 nm-5 .Math.m.

5. The collector according to claim 1, wherein the volume percentage of the conductive particles accounting for the collector is 30 wt%-70 wt%.

6. The collector according to claim 1, wherein the resin material is a polyolefin-based material, for example, a copolymer or a mixture of one or a combination of two or more of a high-density polyethylene, a low-density polyethylene, a polypropylene, a polybutene, and a polymethylpentene.

7. The collector according to claim 1, wherein the thickness is 5-30 .Math.m; and preferably, the thickness of the collector is less than 20 .Math.m, further preferably less than 15 .Math.m, and more preferably less than 10 .Math.m.

8. The collector according to claim 1, wherein the conductive particles form the conductive path with a width of 500 nm-5 .Math.m; and the distance between adjacent conductive paths is 500 nm-5 .Math.m.

9. The collector according to claim 1, wherein the surface impedance is lower than 15mohm/sq, preferably lower than 10mohm/sq.

10. The collector according to claim 1, wherein the density is <0.7 g/cc.

11. A method for preparing the collector according to claim 1, wherein the method comprises: heating a resin to above the melting temperature, and mixing it with conductive particles uniformly; and extruding a molten mixture added with the conductive particles into a rotated cooling roller, rapidly increasing the viscosity of the mixture while cooled to form a film, and then stretching the film to the corresponding thickness and internal structure by a group of stretching rollers.

12. The method according to claim 11, wherein the preheating temperature of a melting furnace is 60° C.-80° C.; and preferably, the stretching speed is 5 m/min-30 m/min, and the stretching tension is 40N-80N.

13. An application of the collector according to claim 1 in preparing a lithium ion battery.

14. The application according to claim 13, wherein the conductive particles comprise carbon material nanoparticles.

15. The application according to claim 13, wherein the carbon material is selected from one or a combination of two or more of a carbon black, a ketjen black, a carbon nanotube, a graphene, a carbon fiber, and a VGCF.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG. 1 is a flow diagram of a preparation process of a collector of Embodiment 1.

[0030] FIG. 2 is a schematic diagram of a process for forming a high-orientation collector with a conductive path structure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] In order to have clearer understanding of technical features, purposes and beneficial effects of the present disclosure, technical schemes of the present disclosure are now described in detail below in combination with the drawings and specific embodiments. It should be understood that these embodiments are only used to describe the present disclosure and not to limit a scope of the present disclosure. In the embodiments, experimental methods without specific conditions are conventional methods and conventional conditions well-known in the field, or operated in accordance with conditions suggested by instrument manufacturers.

Contrast Example 1

[0032] Positive electrode: LFP (10 .Math.m) [0033] Negative electrode: artificial graphite (20 .Math.m) [0034] Diaphragm: 12 .Math.m PE + 2 .Math.m Al.sub.2O.sub.3 [0035] Size: 600 L×300 W×1 Tmm single cell structure [0036] Collector: positive electrode (Al, 12 .Math.m in thickness); and negative electrode (Cu, 8 .Math.m in thickness) [0037] Acupuncture experiment: at a temperature of 20±5° C., a battery is in a full point state (SOC100), a steel needle with a diameter of 3 mm is used to penetrate rapidly in a direction perpendicular to an electrode plate, and the steel needle stays in it.

Embodiment 1

[0038] This embodiment provides a lithium-ion battery, and it includes: [0039] Positive electrode: LFP (10 .Math.m) [0040] Negative electrode: artificial graphite (20 .Math.m) [0041] Diaphragm: 12 .Math.m PE+2 .Math.m Al.sub.2O.sub.3 [0042] Size: 600 L×300 W×1 Tmm single cell structure [0043] Collector: positive electrode (50 wt% carbon black (60 nm) + 50 wt% PP, 15 .Math.m in thickness); negative electrode (50 wt% carbon black (60 nm) + 50 wt% PP, 5 .Math.m in thickness).

[0044] Collector for positive electrode: in the X-Y direction, the number of the conductive particles forming the conductive path does not exceed 20% of the total number of the conductive particles (the resistivity in the X-Y direction is 5 mohm/sq); and in the Z direction, the number of the conductive particles forming the conductive path is not less than 70% of the total number of the conductive particles (the resistivity in the Z direction is 1 mohm/sq), the width of the conductive path formed by the conductive particles is 1 .Math.m, and the distance between the adjacent conductive paths is 1 .Math.m, it may be specifically shown in FIG. 2. The collector is prepared according to the following steps, as shown in FIG. 1: [0045] a resin is heated to above the melting temperature, and mixed with conductive particles uniformly, and the preheating temperature of a melting furnace is 80° C.; and [0046] a molten mixture added with the conductive particles is extruded to a rotated cold roller, the viscosity of the mixture is rapidly increased to form a film while cooled, and then the film is stretched by a group of stretching rollers (stretching speed: 5 m/min, and the stretching tension is 50 N), to obtain the collector with a thickness of 15 .Math.m and a surface impedance of 7 mohm/sq.

[0047] Collector for negative electrode: in the X-Y direction, the number of the conductive particles forming the conductive path does not exceed 20% of the total number of the conductive particles (the resistivity in the X-Y direction is 5 mohm/sq); and in the Z direction, the number of the conductive particles forming the conductive path is not less than 70% of the total number of the conductive particles (the resistivity in the Z direction is 1 mohm/sq), the width of the conductive path formed by the conductive particles is 1 .Math.m, and the distance between the adjacent conductive paths is 1 .Math.m. The collector is prepared according to the following steps, as shown in FIG. 1: [0048] a resin is heated to above the melting temperature, and mixed with conductive particles uniformly, and the preheating temperature of a melting furnace is 80° C.; and [0049] a molten mixture added with the conductive particles is extruded to a rotated cold roller, the viscosity of the mixture is rapidly increased to form a film while cooled, and then the film is stretched by a group of stretching rollers (stretching speed: 5 m/min, and the stretching tension is 50 N), to obtain the collector with a thickness of 15 .Math.m and a surface impedance of 7 mohm/sq.

[0050] Acupuncture experiment: at a temperature of 20±5° C., a battery is in a full point state (SOC100), a steel needle with a diameter of 3 mm is used to penetrate rapidly in a direction perpendicular to an electrode plate, and the steel needle stays in it.

Embodiment 2

[0051] This embodiment provides a lithium-ion battery, and it includes: [0052] Positive electrode: LFP (10 .Math.m) [0053] Negative electrode: artificial graphite (20 .Math.m) [0054] Diaphragm: 12 .Math.m PE+2 .Math.m Al.sub.2O.sub.3 [0055] Size: 600 L×300 W×1 Tmm single cell structure [0056] Collector: positive electrode (50 wt% carbon black (60 nm) + 50 wt% PP, 15 .Math.m in thickness); negative electrode (50 wt% Ni particle (1 .Math.m) + 50 wt% PP, 15 .Math.m in thickness).

[0057] Collector for positive electrode: in the X-Y direction, the number of the conductive particles forming the conductive path does not exceed 10% of the total number of the conductive particles (the resistivity in the X-Y direction is 8 mohm/sq); and in the Z direction, the number of the conductive particles forming the conductive path is not less than 70% of the total number of the conductive particles (the resistivity in the Z direction is 1 mohm/sq), the width of the conductive path formed by the conductive particles is 1 .Math.m, and the distance between the adjacent conductive paths is 1.3 .Math.m. The collector is prepared according to the following steps: [0058] a resin is heated to above the melting temperature, and mixed with conductive particles uniformly, and the preheating temperature of a melting furnace is 80° C.; and [0059] a molten mixture added with the conductive particles is extruded to a rotated cold roller, the viscosity of the mixture is rapidly increased to form a film while cooled, and then the film is stretched by a group of stretching rollers (stretching speed: 5 m/min, and the stretching tension is 60 N), to obtain the collector with a thickness of 15 .Math.m and a surface impedance of 10 mohm/sq.

[0060] Collector for negative electrode: in the X-Y direction, the number of the conductive particles forming the conductive path does not exceed 10% of the total number of the conductive particles (the resistivity in the X-Y direction is 8 mohm/sq); and in the Z direction, the number of the conductive particles forming the conductive path is not less than 70% of the total number of the conductive particles (the resistivity in the Z direction is 1 mohm/sq), the width of the conductive path formed by the conductive particles is 1 .Math.m, and the distance between the adjacent conductive paths is 1.3 .Math.m. The collector is prepared according to the following steps: [0061] a resin is heated to above the melting temperature, and mixed with conductive particles uniformly, and the preheating temperature of a melting furnace is 80° C.; and [0062] a molten mixture added with the conductive particles is extruded to a rotated cold roller, the viscosity of the mixture is rapidly increased to form a film while cooled, and then the film is stretched by a group of stretching rollers (stretching speed: 5 m/min, and the stretching tension is 60 N), to obtain the collector with a thickness of 15 .Math.m and a surface impedance of 13 mohm/sq.

[0063] Acupuncture experiment: at a temperature of 20±5° C., a battery is in a full point state (SOC100), a steel needle with a diameter of 3 mm is used to penetrate rapidly in a direction perpendicular to an electrode plate, and the steel needle stays in it.

Embodiment 3

[0064] This embodiment provides a lithium-ion battery, and it includes: [0065] Positive electrode: LFP (10 .Math.m) [0066] Negative electrode: artificial graphite (20 .Math.m) [0067] Diaphragm: 12 .Math.m PE+2 .Math.m Al.sub.2O.sub.3 [0068] Size: 600 L×300 W×1 Tmm single cell structure [0069] Collector: positive electrode (40 wt% carbon black (60 nm) + 10 wt% ketjen black (30 nm) + 50 wt% PP, 15 .Math.m in thickness); negative electrode (50 wt% Ni particle (1 .Math.m) + 50 wt% PP, 15 .Math.m in thickness).

[0070] Collector for positive electrode: in the X-Y direction, the number of the conductive particles forming the conductive path does not exceed 20% of the total number of the conductive particles (the resistivity in the X-Y direction is 6 mohm/sq); and in the Z direction, the number of the conductive particles forming the conductive path is not less than 70% of the total number of the conductive particles (the resistivity in the Z direction is 1 mohm/sq), the width of the conductive path formed by the conductive particles is 1 .Math.m, and the distance between the adjacent conductive paths is 1 .Math.m. The collector is prepared according to the following steps: [0071] a resin is heated to above the melting temperature, and mixed with conductive particles uniformly, and the preheating temperature of a melting furnace is 80° C.; and [0072] a molten mixture added with the conductive particles is extruded to a rotated cold roller, the viscosity of the mixture is rapidly increased to form a film while cooled, and then the film is stretched by a group of stretching rollers (stretching speed: 5 m/min, and the stretching tension is 50 N), to obtain the collector with a thickness of 15 .Math.m and a surface impedance of 4 mohm/sq.

[0073] Collector for negative electrode: in the X-Y direction, the number of the conductive particles forming the conductive path does not exceed 17% of the total number of the conductive particles (the resistivity in the X-Y direction is 6 mohm/sq); and in the Z direction, the part (number) of the conductive particles forming the conductive path is not less than 70% of the total number of the conductive particles (the resistivity in the Z direction is 1 mohm/sq), the width of the conductive path formed by the conductive particles is 1 .Math.m, and the distance between the adjacent conductive paths is 1.3 .Math.m. The collector is prepared according to the following steps: [0074] a resin is heated to above the melting temperature, and mixed with conductive particles uniformly, and the preheating temperature of a melting furnace is 80° C.; and [0075] a molten mixture added with the conductive particles is extruded to a rotated cold roller, the viscosity of the mixture is rapidly increased to form a film while cooled, and then the film is stretched by a group of stretching rollers (stretching speed: 5 m/min, and the stretching tension is 60 N), to obtain the collector with a thickness of 15 .Math.m and a surface impedance of 13 mohm/sq.

[0076] Acupuncture experiment: at a temperature of 20±5° C., a battery is in a full point state (SOC100), a steel needle with a diameter of 3 mm is used to penetrate rapidly in a direction perpendicular to an electrode plate, and the steel needle stays in it.

Embodiment 4

[0077] This embodiment provides a lithium-ion battery, and it includes: [0078] Positive electrode: LFP (10 .Math.m) [0079] Negative electrode: artificial graphite (20 .Math.m) [0080] Diaphragm: 12 .Math.m PE+2 .Math.m Al.sub.2O.sub.3 [0081] Size: 600 L×300 W×1 Tmm single cell structure [0082] Collector: positive electrode (30 wt% graphene (1 .Math.m) + 10 wt% ketjen black (30 nm) + 10% carbon nanotube (3 nm in diameter, and 100 nm in length) + 50 wt% PP, 15 .Math.m in thickness); negative electrode (50 wt% Ni particle (1 .Math.m) + 50 wt% PP, 10 .Math.m in thickness).

[0083] Collector for positive electrode: in the X-Y direction, the number of the conductive particles forming the conductive path does not exceed 20% of the total number of the conductive particles (the resistivity in the X-Y direction is 8 mohm/sq); and in the Z direction, the number of the conductive particles forming the conductive path is not less than 70% of the total number of the conductive particles (the resistivity in the Z direction is 1 mohm/sq), the width of the conductive path formed by the conductive particles is 1 .Math.m, and the distance between the adjacent conductive paths is 1 .Math.m. The collector is prepared according to the following steps: [0084] a resin is heated to above the melting temperature, and mixed with conductive particles uniformly, and the preheating temperature of a melting furnace is 80° C.; and [0085] a molten mixture added with the conductive particles is extruded to a rotated cold roller, the viscosity of the mixture is rapidly increased to form a film while cooled, and then the film is stretched by a group of stretching rollers (stretching speed: 5 m/min, and the stretching tension is 50 N), to obtain the collector with a thickness of 15 .Math.m and a surface impedance of 3 mohm/sq.

[0086] Collector for negative electrode: in the X-Y direction, the number of the conductive particles forming the conductive path does not exceed 10% of the total number of the conductive particles (the resistivity in the X-Y direction is 8 mohm/sq); and in the Z direction, the number of the conductive particles forming the conductive path is not less than 70% of the total number of the conductive particles (the resistivity in the Z direction is 1 mohm/sq), the width of the conductive path formed by the conductive particles is 1 .Math.m, and the distance between the adjacent conductive paths is 1.3 .Math.m. The collector is prepared according to the following steps: [0087] a resin is heated to above the melting temperature, and mixed with conductive particles uniformly, and the preheating temperature of a melting furnace is 80° C.; and [0088] a molten mixture added with the conductive particles is extruded to a rotated cold roller, the viscosity of the mixture is rapidly increased to form a film while cooled, and then the film is stretched by a group of stretching rollers (stretching speed: 5 m/min, and the stretching tension is 60 N), to obtain the collector with a thickness of 10 .Math.m and a surface impedance of 15 mohm/sq.

[0089] Acupuncture experiment: at a temperature of 20±5° C., a battery is in a full point state (SOC100), a steel needle with a diameter of 3 mm is used to penetrate rapidly in a direction perpendicular to an electrode plate, and the steel needle stays in it.

Embodiment 5

[0090] This embodiment provides a lithium-ion battery, and it includes: [0091] Positive electrode: LFP (10 .Math.m) [0092] Negative electrode: artificial graphite (20 .Math.m) [0093] Diaphragm: 12 .Math.m PE+2 .Math.m Al.sub.2O.sub.3 [0094] Size: 600 L×300 W×1 Tmm single cell structure [0095] Collector: positive electrode (50 wt% carbon black (60 nm) + 50 wt% PE, 15 .Math.m in thickness); negative electrode (30 wt% graphene (1 .Math.m) + 10 wt% ketjen black (30 nm) + 10% carbon nanotube (3 nm in diameter, and 100 nm in length) + 50 wt% PP, 15 .Math.m in thickness).

[0096] Collector for positive electrode: in the X-Y direction, the number of the conductive particles forming the conductive path does not exceed 20% of the total number of the conductive particles (the resistivity in the X-Y direction is 8 mohm/sq); and in the Z direction, the number of the conductive particles forming the conductive path is not less than 70% of the total number of the conductive particles (the resistivity in the Z direction is 1 mohm/sq), the width of the conductive path formed by the conductive particles is 1 .Math.m, and the distance between the adjacent conductive paths is 1 .Math.m. The collector is prepared according to the following steps: [0097] a resin is heated to above the melting temperature, and mixed with conductive particles uniformly, and the preheating temperature of a melting furnace is 80° C.; and [0098] a molten mixture added with the conductive particles is extruded to a rotated cold roller, the viscosity of the mixture is rapidly increased to form a film while cooled, and then the film is stretched by a group of stretching rollers (stretching speed: 5 m/min, and the stretching tension is 50 N), to obtain the collector with a thickness of 15 .Math.m and a surface impedance of 7 mohm/sq.

[0099] Collector for negative electrode: in the X-Y direction, the number of the conductive particles forming the conductive path does not exceed 20% of the total number of the conductive particles (the resistivity in the X-Y direction is 8 mohm/sq); and in the Z direction, the number of the conductive particles forming the conductive path is not less than 70% of the total number of the conductive particles (the resistivity in the Z direction is 1 mohm/sq), the width of the conductive path formed by the conductive particles is 1 .Math.m, and the distance between the adjacent conductive paths is 1 .Math.m. The collector is prepared according to the following steps: [0100] a resin is heated to above the melting temperature, and mixed with conductive particles uniformly, and the preheating temperature of a melting furnace is 80° C.; and [0101] a molten mixture added with the conductive particles is extruded to a rotated cold roller, the viscosity of the mixture is rapidly increased to form a film while cooled, and then the film is stretched by a group of stretching rollers (stretching speed: 5 m/min, and the stretching tension is 50 N), to obtain the collector with a thickness of 15 .Math.m and a surface impedance of 3 mohm/sq.

[0102] Acupuncture experiment: at a temperature of 20±5° C., a battery is in a full point state (SOC100), a steel needle with a diameter of 3 mm is used to penetrate rapidly in a direction perpendicular to an electrode plate, and the steel needle stays in it.

Embodiment 6

[0103] This embodiment provides a lithium-ion battery, and it includes: [0104] Positive electrode: LFP (10 .Math.m) [0105] Negative electrode: artificial graphite (20 .Math.m) [0106] Diaphragm: 12 .Math.m PE+2 .Math.m Al.sub.2O.sub.3 [0107] Size: 600 L×300 W×1 Tmm single cell structure [0108] Collector: positive electrode (50 wt% carbon black (60 nm) + 50 wt% PP, 25 .Math.m in thickness); negative electrode (30 wt% carbon black (60 nm) + 10 wt% ketjen black (30 nm) + 10% carbon nanotube (3 nm in diameter, and 100 nm in length) + 50 wt% PP, 15 .Math.m in thickness).

[0109] Collector for positive electrode: in the X-Y direction, the number of the conductive particles forming the conductive path does not exceed 20% of the total number of the conductive particles (the resistivity in the X-Y direction is 8 mohm/sq); and in the Z direction, the number of the conductive particles forming the conductive path is not less than 70% of the total number of the conductive particles (the resistivity in the Z direction is 1 mohm/sq), the width of the conductive path formed by the conductive particles is 1 .Math.m, and the distance between the adjacent conductive paths is 1 .Math.m. The collector is prepared according to the following steps: [0110] a resin is heated to above the melting temperature, and mixed with conductive particles uniformly, and the preheating temperature of a melting furnace is 80° C.; and [0111] a molten mixture added with the conductive particles is extruded to a rotated cold roller, the viscosity of the mixture is rapidly increased to form a film while cooled, and then the film is stretched by a group of stretching rollers (stretching speed: 5 m/min, and the stretching tension is 50 N), to obtain the collector with a thickness of 15 .Math.m and a surface impedance of 5 mohm/sq.

[0112] Collector for negative electrode: in the X-Y direction, the number of the conductive particles forming the conductive path does not exceed 20% of the total number of the conductive particles (the resistivity in the X-Y direction is 8 mohm/sq); and in the Z direction, the number of the conductive particles forming the conductive path is not less than 70% of the total number of the conductive particles (the resistivity in the Z direction is 1 mohm/sq), the width of the conductive path formed by the conductive particles is 1 .Math.m, and the distance between the adjacent conductive paths is 1 .Math.m. The collector is prepared according to the following steps: [0113] a resin is heated to above the melting temperature, and mixed with conductive particles uniformly, and the preheating temperature of a melting furnace is 80° C.; and [0114] a molten mixture added with the conductive particles is extruded to a rotated cold roller, the viscosity of the mixture is rapidly increased to form a film while cooled, and then the film is stretched by a group of stretching rollers (stretching speed: 5 m/min, and the stretching tension is 50 N), to obtain the collector with a thickness of 15 .Math.m and a surface impedance of 3 mohm/sq.

[0115] Acupuncture experiment: at a temperature of 20±5° C., a battery is in a full point state (SOC100), a steel needle with a diameter of 3 mm is used to penetrate rapidly in a direction perpendicular to an electrode plate, and the steel needle stays in it.

TABLE-US-00001 Contrast example Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Embodiment 6 1 Positive electrod e LFP LFP LFP LFP LFP LFP LFP Negativ e electrod e Artificial graphite Artificial graphite Artificial graphite Artificial graphite Artificial graphite Artificial graphite Artificial graphite Co llector Positiveelectro de Al, 12 .Math.m in thickness 50 wt% carbon black (60 nm) + 50 wt% PP, 15 .Math.m in thickness 50 wt% carbon black (60 nm) + 50 wt% PP, 15 .Math.m in thickness 40 wt% carbon black (60 nm) + 10 wt% ketjen black (30 nm) + 50 wt% PP, 15 .Math.m in thickness 30 wt% graphene (1 .Math.m) + 10 wt% ketjen black (30 nm) + 10% carbon nanotube (3 nm in diameter, and 100 nm in length) + 50 wt% PP, 15 .Math.m in thickness 50 wt% carbon black (60 nm) + 50 wt% PE, 15 .Math.m in thickness 50 wt% carbon black (60 nm) + 50 wt% PP, 25 .Math.m in thickness Negati ve elec Cu, 8 .Math.m in thickness 50 wt% carbon black (60 nm) + 50 wt% PP, 15 .Math.m 50 wt% Ni particle (1 .Math.m) + 50 wt% PP, 15 .Math.m in 50 wt% Ni particle (1 .Math.m) + 50 wt% PP, 15 .Math.m in 50 wt% Ni particle (1 .Math.m) + 50 wt% PP, 10 .Math.m in 30 wt% graphene (1 .Math.m) + 10 wt% ketjen black (30 30 wt% carbon black (60 nm) + 10 wt% ketjen trode in thickness thickness thickness thickness nm) + 10% carbon nanotube (3 nm in diameter, and 100 nm in length) + 50 wt% PP, 15 .Math.m in thickness black (30 nm) + 10% carbon nanotube (3 nm in diameter, and 100 nm in length) + 50 wt% PP, 15 .Math.m in thickness Single cell length (mm) 600 600 600 600 600 600 600 Single cell width (mm) 300 300 300 300 300 300 300 Single cell height (mm) 1 1 1 1 1 1 1 Single cell energy density (Wh/kg) 190 210 205 200 200 200 200 Single 390 390 390 390 390 390 380 cell energy density (Wh/L) (Wh/L) Single cell capacit y (Ah) 66 60 66 66 66 59 58 First effect (%) 94 90 93 93 93 89 88 Cycle 2000 1000 2000 2000 2000 800 800 EOL DCIR 120% 150% 125% 125% 120% 165% 170% Pack energy density (Wh/kg) 152 160 164 164 164 164 164 Pack energy density (Wh/L) 152 310 310 310 310 310 310 1C/0.1 C 95% 93% 93% 93% 94% 96% 96% 6 C/0.1 C 80% 72% 74% 76% 79% 82% 83% Acupun cture experim 5 3 3 3 3 3 3 ent (HL)

[0116] It may be seen from Table 1 that, the resin-based collector of the present disclosure is used, the volume energy density of Pack and the safety performance of the battery are both greatly improved (acupuncture experiment).