A method of preparing an electrochemical electrode which is partially or totally covered with a film that is obtained by spreading an aqueous solution comprising a water-soluble binder over the electrode and subsequently drying same. The production cost of the electrodes thus obtained is reduced and the surface porosity thereof is associated with desirable resistance values.

A separator which includes: a porous polymer substrate having a plurality of pores; a separator base including a porous coating layer formed on at least one surface of the porous polymer substrate; and an adhesive layer formed on at least one surface of the separator base, said adhesive layer comprising a plurality of second inorganic particles and adhesive resin particles, wherein the weight ratio of the second inorganic particles to the adhesive resin particles is 5:95-60:40, and the diameter of the adhesive resin particles is 1.1-3.5 times the diameter of the second inorganic particles. An electrochemical device including the separator is also disclosed. The separator shows improved adhesion between an electrode and the separator, maintains the pores of the adhesive layer even after a process of electrode lamination, and improves the resistance of an electrochemical device.

A separator which includes: a porous polymer substrate having a plurality of pores; a separator base including a porous coating layer formed on at least one surface of the porous polymer substrate; and an adhesive layer formed on at least one surface of the separator base, said adhesive layer comprising a plurality of second inorganic particles and adhesive resin particles, wherein the weight ratio of the second inorganic particles to the adhesive resin particles is 5:95-60:40, and the diameter of the adhesive resin particles is 1.1-3.5 times the diameter of the second inorganic particles. An electrochemical device including the separator is also disclosed. The separator shows improved adhesion between an electrode and the separator, maintains the pores of the adhesive layer even after a process of electrode lamination, and improves the resistance of an electrochemical device.

An anode piece for a lithium battery having both high safety and high capacity, and a preparation method and a use therefor, the anode piece being mixed with a lithium-rich compound, the lithium-rich compound being at least one selected from lithium-rich manganese-based solid solution, a lithium-rich solid electrolyte or a lithium-separated silicon oxide. Li ions can be pulled away from the lithium-rich compound in extreme conditions such as overcharging, internal short circuiting, external short circuiting, thermal abuse, piercing, compressing or overheating, thereby filling in lithium vacancies in the anode material, stabilizing the crystal lattice structure of the anode material, improving safety performance in a battery manufactured by using the material, and allowing the anode piece to maintain excellent cycle performance at higher area capacities.

---A non-woven fabric and a preparation method therefore, a lithium battery diaphragm and a lithium battery diaphragm base membrane, relating to the field of materials. Raw materials of the non-woven fabric include main fibers and bonding fibers, wherein the bonding fibers include first bonding fibers and second bonding fibers; the melting point or softening point of the first bonding fibers is 120-220° C., and the melting point or softening point of the second bonding fibers is 100-170° C., the melting point or softening point of the second bonding fibers is at least 15° C. lower than that of the first bonding fibers; and the melting point or softening point of the main fibers is at least 20° C. higher than that of the first bonding fibers.---

---A non-woven fabric and a preparation method therefore, a lithium battery diaphragm and a lithium battery diaphragm base membrane, relating to the field of materials. Raw materials of the non-woven fabric include main fibers and bonding fibers, wherein the bonding fibers include first bonding fibers and second bonding fibers; the melting point or softening point of the first bonding fibers is 120-220° C., and the melting point or softening point of the second bonding fibers is 100-170° C., the melting point or softening point of the second bonding fibers is at least 15° C. lower than that of the first bonding fibers; and the melting point or softening point of the main fibers is at least 20° C. higher than that of the first bonding fibers.---

A separator for a lithium secondary battery and a method for manufacturing the same. The separator for a lithium secondary battery includes: a porous polymer substrate; and a porous coating layer on at least one surface of the porous polymer substrate. The porous coating layer includes inorganic particles, a fluorine-containing binder polymer (A), and an ethylenic copolymer (B) having an ethylene monomer-derived repeating unit (a) and a vinyl acetate monomer-derived repeating unit (b). It is possible to provide a separator having improved adhesion peel strength between the porous coating layer and the porous polymer substrate and improved adhesion Lami strength to an electrode at the same time and a method for manufacturing the same by using an ethylenic copolymer having predetermined characteristics.

A separator for a lithium secondary battery and a method for manufacturing the same. The separator for a lithium secondary battery includes: a porous polymer substrate; and a porous coating layer on at least one surface of the porous polymer substrate. The porous coating layer includes inorganic particles, a fluorine-containing binder polymer (A), and an ethylenic copolymer (B) having an ethylene monomer-derived repeating unit (a) and a vinyl acetate monomer-derived repeating unit (b). It is possible to provide a separator having improved adhesion peel strength between the porous coating layer and the porous polymer substrate and improved adhesion Lami strength to an electrode at the same time and a method for manufacturing the same by using an ethylenic copolymer having predetermined characteristics.

A lithium-ion battery separator with high-temperature resistance, a preparation method thereof and a lithium-ion battery prepared therefrom fall within the field of lithium-ion battery separators. The separator has a thickness of 3.5-30 μm, a porosity of 30-80%, an adjustable pore size of 20-2000 nm, a biaxial tensile strength of ≥50 MPa, an air permeability of ≤400 s/100 cc, and a breaking temperature of ≥160° C. The preparation method comprises the following steps: mixing, melting, and plasticizing 20%-60% of a polypropylene main material, 2%-10% of a solubilizer, 30%-80% of a solvent. 0.1%-5% of a nucleating aid and/or 0.1%-1% of an antioxidant, carrying out twin-screw extrusion, carrying out thermally induced phase separation to obtain a cast sheet, and carrying out cast sheet stretching, extraction, and post-treatment or directly carrying out extraction and post-treatment. The separator has the characteristics of high-temperature resistance, biaxial high strength, uniform pore size, high specific resistance.

A lithium-ion battery separator with high-temperature resistance, a preparation method thereof and a lithium-ion battery prepared therefrom fall within the field of lithium-ion battery separators. The separator has a thickness of 3.5-30 μm, a porosity of 30-80%, an adjustable pore size of 20-2000 nm, a biaxial tensile strength of ≥50 MPa, an air permeability of ≤400 s/100 cc, and a breaking temperature of ≥160° C. The preparation method comprises the following steps: mixing, melting, and plasticizing 20%-60% of a polypropylene main material, 2%-10% of a solubilizer, 30%-80% of a solvent. 0.1%-5% of a nucleating aid and/or 0.1%-1% of an antioxidant, carrying out twin-screw extrusion, carrying out thermally induced phase separation to obtain a cast sheet, and carrying out cast sheet stretching, extraction, and post-treatment or directly carrying out extraction and post-treatment. The separator has the characteristics of high-temperature resistance, biaxial high strength, uniform pore size, high specific resistance.