POLYMER ELECTROLYTE AND LITHIUM-ION BATTERY INCLUDING THE POLYMER ELECTROLYTE

Abstract

Provided are a polymer electrolyte and a lithium-ion battery including the polymer electrolyte. A preparation method of a polymer electrolyte includes: (1) dissolving a functional polymer with an organic solvent, and uniformly mixing to obtain a system A, where the functional polymer has a mass ratio of 0.2%-30% in the system A; (2) uniformly mixing the A system, a lithium salt, and a functional additive to obtain a mixed solution; (3) subjecting the mixed solution to in-situ polymerizing to obtain the polymer electrolyte. The polymer electrolyte has better affinity with anions of the lithium salt and relatively high electrical conductivity, and greatly improves the performance of the semi-solid state battery. The semi-solid state battery prepared is based on the existing lithium-ion battery processing technology, has good processing performance and electrochemical performance, and has certain application prospects.

Claims

1. A polymer electrolyte, wherein the polymer electrolyte at least contains one carbonate structure, one ester structure, one boron structure, and one fluorine structure; wherein the carbonate structure, the ester structure, the boron structure, and the fluorine structure can be combined with each other to form different chain sections.

2. The polymer electrolyte according to claim 1, wherein the polymer electrolyte has any one structure of the following formula (I), formula (II), or formula (III): ##STR00010## wherein R.sub.1 to R.sub.23 each is an organic functional group.

3. The polymer electrolyte according to claim 1, wherein the polymer electrolyte comprises a vinyl carbonate structure, a vinyl ester structure, a vinyl-containing boron-containing functional group structure, and a fluorine-containing functional group structure.

4. The polymer electrolyte according to claim 3, wherein the vinyl carbonate structure has a formula as follows: ##STR00011##

5. The polymer electrolyte according to claim 3, wherein the vinyl ester structure has a formula as follows: ##STR00012##

6. The polymer electrolyte according to claim 3, wherein the vinyl-containing boron-containing functional group structure has a structural formula as follows: ##STR00013##

7. The polymer electrolyte according to claim 3, wherein the fluorine-containing functional group structure has a structural formula as follows: ##STR00014##

8. A preparation method of a polymer electrolyte, comprising: (1) dissolving a functional polymer with an organic solvent, and uniformly mixing to obtain a system A, wherein the functional polymer has a mass ratio of 0.2%-30% in the system A, based on a total mass of the system A; (2) uniformly mixing the system A, a lithium salt, and a functional additive to obtain a mixed solution; (3) subjecting the mixed solution to in-situ polymerizing to obtain the polymer electrolyte.

9. A polymer electrolyte obtained according to the method of claim 8.

10. A lithium-ion battery comprising the polymer electrolyte of claim 1.

11. A lithium-ion battery comprising the polymer electrolyte of claim 9.

12. The polymer electrolyte according to claim 1, wherein a unit mole of the polymer electrolyte contains 0.8 to 0.95 mole part of the carbonate structure and the ester structure, and 0.01 to 0.25 mole part of the boron structure and the fluorine structure.

13. The polymer electrolyte according to claim 1, having a number average molecular weight of 500 to 300,000.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0062] FIG. 1 is a diagram of a lithium-ion battery in an example of the present disclosure to undergo a charge-discharge cycle test.

DESCRIPTION OF EMBODIMENTS

[0063] The technical solutions of the present disclosure will be described in detail below combined with the drawings and examples, but the present disclosure is not limited in the scope of the examples.

[0064] The experimental methods for which specific conditions are not indicated in the following examples are selected according to conventional methods and conditions, or according to the trade descriptions. The reagents and materials used in the present disclosure are commercially available.

Example 1

[0065] The present example discloses a preparation method of a polymer electrolyte, including:

[0066] (1) based on parts by weight, adding 20 parts of polymethyl methacrylate, and 10 parts of polymethyl acrylate into a reagent consisting of 5 parts of allyl methyl carbonate, 25 parts of vinyl ethylene carbonate, 5 parts of allyl diethylene glycol dicarbonate, 3 parts of allyl heptanoate, 4 parts of itaconic anhydride, 8 parts of allyl hexanoate, 3 parts of diallyl phthalate, 6 parts of 2-methacrylic anhydride, 6 parts of allyl acetate, 2 parts of 4,4-dimethyl-2-vinyl-2-oxazolin-5-one, and 3 parts of 2-methyl-2-propenyl acetate, and uniformly mixing to obtain a system A, where the mass ratio of the functional polymer (i.e., 20 parts of polymethyl methacrylate and 10 parts of polymethyl acrylate) in the system A is 30%;

[0067] (2) uniformly mixing 100 parts of the system A and a functional additive of 0.01 part of boron allyloxide, then adding lithium perchlorate (LiClO.sub.4) and lithium hexafluorophosphate (LiPF.sub.6) (with a mass ratio of 1:5) until the lithium salts are fully dissolved and the lithium salts have a concentration of 4 mol/L in the mixed solution;

[0068] (3) subjecting the mixed solution to in-situ polymerizing at 60° C. to obtain the polymer electrolyte.

Example 2

[0069] The present example discloses a preparation method of a lithium-ion battery, including:

[0070] S1: based on parts by weight, adding 0.01 part of polystyrene into a reagent consisting of 2 parts of diallyl carbonate, 1 part of allyl trifluoroacetate, 2 parts of allyl acetoacetate, and uniformly mixing to obtain a system A, where a mass ratio of the functional polymer (i.e., 0.01 part of polystyrene) in the system A is 0.2%;

[0071] S2: uniformly mixing 50 parts of the system A, 6 parts of allylpentafluorobenzene, and 6.5 parts of 1,2,2-trifluorovinyltriphenylsilane, adding lithium hexafluorophosphate (LiPF.sub.6), lithium hexafluoroarsenate (LiAsF.sub.6), lithium tetrafluoroborate (LiBF.sub.4), lithium bisoxalate borate (LiBOB) (with the mass ratio of 5:2:1:1), until the lithium salts are fully dissolved and the concentration of the lithium salts in the mixed solution is 1.1 mol/L;

[0072] S3: adding the mixed solution into a battery cell, and performing hot pressing treatment at 80° C. and then in-situ polymerizing and bonding to obtain a lithium-ion battery.

[0073] Specifically, the S3 includes:

[0074] S31: injecting the mixed solution into the battery cell, and the mixed solution fully impregnates a positive electrode sheet, a negative electrode sheet and a position between a positive electrode and a negative electrode;

[0075] S32: encapsulating the battery cell;

[0076] S33: subjecting the battery cell to the hot pressing treatment at 80° C. and then the in-situ polymerizing and bonding.

[0077] S34: encapsulating again to obtain the lithium-ion battery.

Example 3

[0078] The present example discloses a preparation method of a polymer electrolyte, including:

[0079] (1) adding 2 parts of polyacrylonitrile, 10 parts of polymethyl methacrylate, 6 parts of poly(vinyl acetate), 2 parts of polyvinylidene fluoride-hexafluoropropylene into a reagent consisting of 2 parts of diallyl pyrocarbonate, 10 parts of vinyl ethylene carbonate, 4 parts of allyl phenyl carbonate, 20 parts of 2-methylene butyrolactone, 20 parts of dimethylaminoethyl acrylate, 4 parts of hexafluoroisopropyl methacrylate, 1 part of 1H,1H-perfluorooctyl methacrylate, 5 parts of trifluoroethyl methacrylate, 4 parts of isooctyl acrylate, and 10 parts of 4-hydroxybutyl acrylate, uniformly mixing to obtain a system A, where the mass ratio of the functional polymer (i.e., 2 parts of polyacrylonitrile, 10 parts of polymethyl methacrylate, 6 parts of poly(vinyl acetate), and 2 parts of polyvinylidene fluoride-hexafluoropropylene) in the system A is 20%;

[0080] (2) uniformly mixing 90 parts of the system A and a functional additive of parts of trans-3-phenylpropen-l-yl-boronic acid, 3 parts of 4-trifluoromethyl-trans-beta-styrylboronic acid pinacol ester, and 5 parts of 2,2-dimethylethenylboronic acid, adding lithium hexafluorophosphate (LiPF.sub.6), lithium oxalate difluoroborate (LiDFOB), lithium bisfluorosulfonimide (LiFSI) (with a mass ratio of 4:1:2), until the lithium salts are fully dissolved and the concentration of the lithium salts in the mixed solution is 0.5 mol/L;

[0081] (3) subjecting the mixed solution to in-situ polymerizing at 70° C. to obtain the polymer electrolyte.

Example 4

[0082] The present example discloses a preparation method of a lithium-ion battery, including:

[0083] S1: based on parts by weight, adding 0.3 part of polymethyl acrylate, 0.2 part of polyvinylidene fluoride into a reagent consisting of 1 part of 3-acetoxy-1-propenylboronic acid pinacol ester, 2 parts of 2-methyl-2-propene-1,1-diol diacetate, 1 part of allyl (triphenylphosphoranylidene) acetate, 2 parts of 1-ethyl-2-propenyl acetate, 2.5 parts of vinyl ethylene carbonate, 1 part of allyl phenyl carbonate, and uniformly mixing to obtain a system A, where the mass ratio of the functional polymer (i.e., 0.3 part of polymethyl acrylate and 0.2 part of polyvinylidene fluoride) in the system A is 0.5%;

[0084] S2: uniformly mixing 50 parts of the system A, 0.2 part of 4-vinylphenylboronic acid, 0.2 part of isopropenylboronic acid MIDA ester, and 0.11 part of trans-2-[3,5-bis(trifluoromethyl)phenyl]vinylboronic acid pinacol ester, adding lithium bistrifluoromethanesulfonimide (LiTFSI), lithium trifluoromethanesulfonate (LiCF.sub.3SO.sub.3), lithium bis(malonato)borate (LiBMB), and lithium hexafluorophosphate (LiPF.sub.6) (with a mass ratio of 3:1:1:4), until the lithium salts are fully dissolved and the concentration of the lithium salts in the mixed solution is 1.2 mol/L;

[0085] S3: adding the mixed solution into a battery cell, and performing hot pressing treatment at 65° C., and then in-situ polymerizing and bonding to obtain a lithium-ion battery.

[0086] Specifically, the S3 includes:

[0087] S31: injecting the mixed solution into the battery cell, and the mixed solution fully impregnates a positive electrode sheet, a negative electrode sheet and a position between a positive electrode and a negative electrode;

[0088] S32: encapsulating the battery cell;

[0089] S33: subjecting the battery cell to the hot pressing treatment at 65° C. and then the in-situ polymerizing and bonding.

[0090] S34: encapsulating again to obtain the lithium-ion battery.

Example 5

[0091] The present example discloses a preparation method of a polymer electrolyte, including:

[0092] (1) adding 0.5 part of polymethyl methacrylate, 0.5 part of polyacrylonitrile into a reagent consisting of 1 part of methyl 2-(trifluoromethyl)acrylate, 1 part of 2-methoxyethyl acrylate, 1 part of maleic anhydride, 2 parts of isobutyl methacrylate, 2 parts of n-butyl acrylate, 4 parts of 2-cyclohexyl methacrylate, 1 part of benzyl methacrylate, 1 part of 2,2,3,3-tetrafluoropropyl methacrylate, 3 parts of vinyl ethylene carbonate, and 3 parts of diallyl carbonate, and uniformly mixing to obtain an system A, where the mass ratio of the functional polymer (i.e., 0.5 part of polymethyl methacrylate and 0.5 part of polyacrylonitrile) in the system A is 5%;

[0093] (2) uniformly mixing 100 parts of the system A and a functional additive of 0.1 part of perfluoroallylbenzene, 0.2 part of phenyl trifluorovinyl ether, 0.22 part of 1-phenylvinylboronic acid, adding lithium hexafluorophosphate (LiPF.sub.6), lithium difluorophosphate (LiPF.sub.2O.sub.2), lithium 4,5-dicyano-2-trifluoromethyl imidazole (LiDTI) (with a mass ratio of 5:1:2), until the lithium salts are fully dissolved and the concentration of the lithium salts in the mixed solution is 2 mol/L;

[0094] (3) subjecting the mixed solution to in-situ polymerizing at 85° C. to obtain the polymer electrolyte.

Example 6

[0095] The present example discloses a preparation method of a lithium-ion battery, including:

[0096] S1: based on parts by weight, adding 0.5 part of polystyrene, and 2.5 parts of polymethyl acrylate into a reagent consisting of 1 part of diallyl pyrocarbonate, 4 parts of vinyl ethylene carbonate, 4 parts of diallyl carbonate, 3 parts of 2-methoxyethyl acrylate, 3 parts of maleic anhydride, and 2 parts of isobutyl methacrylate, and uniformly mixing to obtain a system A, where the mass ratio of the functional polymer (i.e., 0.5 part of polystyrene and 2.5 parts of polymethyl acrylate) in the system A is 15%;

[0097] S2: uniformly mixing 35 parts of the system A, 5 parts of

[0098] (E)-1-ethoxyethene-2-boronic acid pinacol ester and 10 parts of isopropenylboronic acid pinacol ester, adding lithium hexafluorophosphate (LiPF.sub.6), lithium malonate oxalate borate (LiMOB), lithium hexafluoroantimonate (LiSbF.sub.6), lithium 4,5-dicyano-2-trifluoromethyl imidazole (LiDTI), lithium bis(trifluoromethylsulfonyl)imide (LiN(SO.sub.2CF.sub.3).sub.2) (with a mass ratio of 3:1:2:1:1), until the lithium salts are fully dissolved and the concentration of the lithium salts in the mixed solution is 1.0 mol/L;

[0099] S3: adding the mixed solution into a battery cell, and performing hot pressing treatment at 90° C. and then in-situ polymerizing and bonding to obtain a lithium-ion battery.

[0100] Specifically, the S3 includes:

[0101] S31: injecting the mixed solution into the battery cell, and the mixed solution fully impregnates a positive electrode sheet, a negative electrode sheet and a position between a positive electrode and a negative electrode;

[0102] S32: encapsulating the battery cell;

[0103] S33: subjecting the battery cell to the hot pressing treatment at 90° C. and then in-situ polymerizing and bonding.

[0104] S34: encapsulating again to obtain the lithium-ion battery.

Example 7

[0105] The present example discloses a preparation method of a polymer electrolyte, including:

[0106] (1) based on parts by weight, adding 0.2 part of aromatic nitrile-based polymer or nitrile copolymer into a reagent consisting of 4 parts of vinyl ethylene carbonate, 4 parts of diallyl carbonate, 4 parts of butyl methacrylate, 4 parts of hydroxyethyl methacrylate, 2 parts of 4,4,4-trifluorocrotonate, 2 parts of 1H,1H-perfluoro-n-decyl acrylate, and uniformly mixing to obtain a system A, where the mass ratio of the functional polymer (i.e., 0.2 part of aromatic nitrile-based polymer or nitrile copolymer) in the system A is 0.99%;

[0107] (2) uniformly mixing 44 parts of the system A and a functional additive of 2 parts of vinylboronic acid pinacol ester, 2 parts of 2-ethoxycarbonylvinylboronic acid pinacol ester, 1 part of 1-(trifluoromethyl)vinylboronic acid hexylene glycol ester, and 1 part of 1-phenylvinylboronic acid pinacol ester, adding lithium hexafluorophosphate (LiPF.sub.6), and lithium malonate oxalate borate (LiMOB) (with a mass ratio of 3:1), until the lithium salts are fully dissolved and the concentration of the lithium salts in the mixed solution is 3 mol/L;

[0108] (3) subjecting the mixed solution to in-situ polymerizing at 70° C. to obtain the polymer electrolyte.

Example 8

[0109] The present example discloses a preparation method of a lithium-ion battery, including:

[0110] S1: based on parts by weight, adding 4.5 parts of polymethyl methacrylate, and 0.5 part of polyvinylidene fluoride-hexafluoropropylene into a reagent consisting of 15 parts of allyl methyl carbonate, 5 parts of vinyl ethylene carbonate, 10 parts of 2-methyl-2-propenyl acetate, 8 parts of allyl trifluoroacetate, and 7 parts of n-butyl acrylate, and uniformly mixing to obtain a system A, where the mass ratio of the functional polymer (i.e., 4.5 parts of polymethyl methacrylate and 0.5 part of polyvinylidene fluoride-hexafluoropropylene) in the system A is 10%;

[0111] S2: uniformly mixing 47.5 parts of the system A, 2 parts of 1-(4-fluorophenyl)vinylboronic acid pinacol ester, 1 part of 4,4,6-trimethyl-2-vinyl-1,3,2-dioxaborinane, 1 part of perfluoroethyl vinyl ether and 1 part of 4,5,5-trifluoropent-4-enoic acid, adding lithium hexafluorophosphate (LiPF.sub.6), lithium bistrifluoromethanesulfonimide (LiTFSI), lithium bis(trifluoromethylsulfonyl)imide (with a mass ratio of 4:1:2), until the lithium salts are fully dissolved and the concentration of the lithium salts in the mixed solution is 1.5 mol/L;

[0112] S3: adding the mixed solution into a battery cell, and performing hot pressing treatment at 75° C. and then in-situ polymerizing and bonding to obtain a lithium-ion battery.

[0113] Specifically, the S3 includes:

[0114] S31: injecting the mixed solution into the battery cell, and the mixed solution fully impregnates a positive electrode sheet, a negative electrode sheet and a position between a positive electrode and a negative electrode;

[0115] S32: encapsulating the battery cell;

[0116] S33: subjecting the battery cell to the hot pressing treatment at 75° C. and then the in-situ polymerizing and bonding.

[0117] S34: encapsulating again to obtain the lithium-ion battery.

Example 9

[0118] The present example discloses a preparation method of a polymer electrolyte, including:

[0119] (1) based on parts by weight, adding 1.5 part of polymethyl acrylate into a reagent consisting of 10 parts of allyl methyl carbonate, 5 parts of vinyl ethylene carbonate, 4 parts of vinyl ethylene carbonate, 3 parts of allyl acetoacetate, 6 parts of allyl hexanoate, 7 parts of 2-methyl-2-propenyl acetate, 5 parts of butyl methacrylate, and 8.5 parts of 2-methylene butyrolactone, and uniformly mixing to obtain a system A, where the mass ratio of the functional polymer (i.e., 1.5 part of polymethyl acrylate) in the system A is 3%;

[0120] (2) uniformly mixing 40.5 parts of the system A and a functional additive of 1.5 part of boron allyloxide, 1.5 part of 1-(trifluoromethyl)vinylboronic acid hexylene glycol ester, 1.5 part of trifluoromethyl trifluorovinyl ether, adding lithium hexafluorophosphate (LiPF.sub.6), lithium bisoxalate borate (LiBOB), and lithium trifluoromethanesulfonate (LiCF.sub.3SO.sub.3) (with a mass ratio of 4:1:2), until the lithium salts are fully dissolved and the concentration of the lithium salts in the mixed solution is 2 mol/L;

[0121] (3) subjecting the mixed solution to in-situ polymerizing at 80° C. to obtain the polymer electrolyte.

Example 10

[0122] The present example discloses a preparation method of a lithium-ion battery, including:

[0123] S1: based on parts by weight, adding 1 part of aromatic nitrile-based polymer or nitrile copolymer, and 5 parts of polymethyl methacrylate into a reagent consisting of 4 parts of vinyl ethylene carbonate, 6 parts of diallyl carbonate, 9 parts of allyl diethylene glycol dicarbonate, 7 parts of 2-methacrylic anhydride, 4 parts of 2-methyl-2-propenyl acetate, 4 parts of allyl trifluoroacetate, 5 parts of butyl methacrylate, and 5 parts of 2-methylene butyrolactone, and uniformly mixing to obtain a system A, where the mass ratio of the functional polymer (i.e., 1 part of aromatic nitrile-based polymer or nitrile copolymer, and 5 parts of polymethyl methacrylate) in the system A is 12%;

[0124] S2: uniformly mixing 46.5 parts of the system A, 0.2 part of isopropenylboronic acid MIDA ester, 0.9 part of (E)-1-ethoxyethene-2-boronic acid pinacol ester, 0.4 part of 1-phenylvinylboronic acid, 0.5 part of methyl 2-fluoroacrylate and 1.5 part of 4,5,5-trifluoropent-4-enoic acid, then adding lithium perchlorate (LiClO.sub.4), lithium hexafluorophosphate (LiPF.sub.6), lithium bis(malonato)borate (LiBMB), and lithium malonate oxalate borate (LiMOB) (with a mass ratio of 4:1:2:1), until the lithium salts are fully dissolved and the concentration of the lithium salts in the mixed solution is 1.6 mol/L;

[0125] S3: adding the mixed solution into a battery cell, and performing hot pressing treatment at 90° C. and then in-situ polymerizing and bonding to obtain a lithium-ion battery.

[0126] Specifically, the S3 includes:

[0127] S31: injecting the mixed solution into the battery cell, and the mixed solution fully impregnates a positive electrode sheet, a negative electrode sheet and a position between a positive electrode and a negative electrode;

[0128] S32: encapsulating the battery cell;

[0129] S33: subjecting the battery cell to the hot pressing treatment at 90° C. and then the in-situ polymerizing and bonding.

[0130] S34: encapsulating again to obtain the lithium-ion battery.

Comparative Example 1

[0131] A preparation method of a lithium-ion battery disclosed in Comparative Example 1 of the present disclosure includes the following steps: uniformly mixing ethylene carbonate (EC), diethyl carbonate (DEC), and propylene carbonate (PC) in a mass ratio of 35:55:10 to obtain a non-aqueous solvent, then adding a certain amount of lithium hexafluorophosphate (LiPF.sub.6), lithium bisoxalate borate (LiBOB), lithium trifluoromethanesulfonate (LiCF.sub.3SO.sub.3) (with a mass ratio of 4:1:2) into the mixed solution according to the total mass of the electrolyte solution until the lithium salts are fully dissolved and the concentration of the lithium salts in the mixed solution is 2 mol/L so as to obtain a liquid state electrolyte solution.

[0132] A positive electrode sheet, a separation film, and a negative electrode sheet are assembled in sequence, the electrolyte solution prepared above is injected into a dried battery, and a lithium-ion battery of Comparative Example 1 is obtained through processes of encapsulation, quiescence, formation, etc.

[0133] Experimental Data

[0134] 1. The electrical conductivity performances of the electrolytes in respective examples were tested, and the results are shown as Table 1.

TABLE-US-00001 TABLE 1 Sample number Electrical conductivity/(mS/cm) Example 1 3.51 Example 2 5.62 Example 3 3.21 Example 4 4.83 Example 5 5.12 Example 6 4.62 Example 7 4.17 Example 8 3.28 Example 9 5.56 Example 10 5.36 Comparative Example 1 6.23

[0135] The electrical conductivity range of the examples of the present disclosure is between 3.21-5.56 mS/cm, and the electrical conductivity of the comparative example is 6.23 mS/cm. The electrical conductivity of the examples of the present disclosure is slightly lower than that of the liquid state electrolyte solution, but higher than 1.0 mS/cm, which can meet the application requirements.

[0136] 2. Charge-Discharge of the Lithium-Ion Battery

[0137] The lithium-ion batteries prepared in Examples 2, 4, 6, 8, 10 and Comparative Example 1 were subjected to a charge-discharge cycle test, and the results are shown as FIG. 1. The test conditions were 25° C., 50% humidity, and 1C/1C charge-discharge. A table made by the corresponding numerical points in FIG. 1 is shown as Table 2.

TABLE-US-00002 TABLE 2 Capacity Capacity Capacity retention retention retention EarnpIe and rate (%) for rate (%) for rate (%) for Comparative Example 400 cycles 800 cycles 1000 cycles Comparative Example 1 100.4 98.1 96.2 Example 2 100.3 97.4 95.6 Example 4 100.4 97.7 95.8 Example 6 100.8 97.5 96.2 Example 8 100.6 97.8 95.7  Example 10 100.4 97.9 96.6

[0138] It can be seen from FIG. 1 that the performance of the lithium-ion batteries prepared by the method disclosed in the present disclosure is close to the performance of the lithium-ion battery prepared by Comparative Example 1, which can meet the application requirements.

[0139] 3. Safety Performance of the Lithium-Ion Battery

[0140] The lithium-ion batteries prepared in Examples 2, 4, 6, 8, 10 and Comparative Example 1 were fully charged (fully charged battery cells), and then subjected to puncture, extrusion and drop tests. The results are shown as Table 3.

TABLE-US-00003 TABLE 3 Sample number Puncture Extrusion Drop Example 2 Pass (pass Pass (pass Pass (pass rate 98%) rate 98%) rate 98%) Example 4 Pass (pass Pass (pass Pass (pass rate 97%) rate 97%) rate 99%) Example 6 Pass (pass Pass (pass Pass (pass rate 99%) rate 98%) rate 97%) Example 8 Pass (pass Pass (pass Pass (pass rate 98%) rate 97%) rate 97%)  Example 10 Pass (pass Pass (pass Pass (pass rate 97%) rate 99%) rate 98%) Comparative Pass (pass Pass (pass Pass (pass Example 1 rate 16%) rate 22%) rate 17%)

[0141] From the data in the above table, the results indicate that:

[0142] the puncture, extrusion, and drop safety tests of lithium batteries can be passed in Examples 2, 4, 6, 8 under the conditions, effectively improving the safety performance of the lithium-ion batteries. Comparative Example 1 has a relatively low pass rate.

[0143] Based on the above experimental data, it is shown that the polymer electrolyte prepared in the present disclosure can effectively improve the safety of lithium-ion batteries.

[0144] 4. Internal Resistance and Voltage Data of the Lithium-Ion Battery

[0145] A ternary material was used as a positive electrode in Example 2, Example 4, Example 6, Example 8, Example 10, and Comparative Example 1 to prepare lithium-ion batteries, and average voltage and lithium-ion battery internal resistance tests were performed on the lithium-ion batteries. The results are shown as Table 4.

TABLE-US-00004 TABLE 4 Average voltage of Internal resistance o Sample number lithium battery lithium-ion battery Example 2 4.2013 V 15.08 mΩ Example 4 4.2011 V 14.81 mΩ Example 6 4.2009 V 14.66 mΩ Example 8 4.2008 V 15.32 mΩ  Example 10 4.2012 V 14.24 mΩ Comparative Example 1 4.2010 V 12.23 mΩ

[0146] The cationic polymerization method was adopted in Example 2, Example 4, Example 6, Example 8, Example 10 and used in the semi-solid state lithium-ion batteries. Compared with Comparative Example 1, it can be known from the data in Table 3 that the lithium-ion batteries prepared in Example 2, Example 4, Example 6, Example 8, Example 10 and Comparative Example 1, after being sorted, have the voltage and internal resistance within a normal range, which can meet the application requirements.

[0147] The above examples are preferred embodiments of the present disclosure, but the embodiments of the present disclosure are not limited by the above examples. Any other changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principle of the present disclosure shall all be equivalent substitute modes, and all included within the protection scope of the present disclosure.