▎ 摘　　要

NOVELTY - Cathode adhesive, is claimed. The cathode adhesive is organic inorganic composite emulsion with core shell structure comprising an organic core and an inorganic shell. The inorganic shell is covered outside the organic core. The organic core is styrene-butadiene copolymer emulsion. The inorganic shell is a mixture of modified hydrated oxide sol and a small amount of organic matter. The modified hydrated oxide sol includes silica sol, aluminum sol, titanium sol and/or zirconium sol. USE - Used as cathode adhesive. ADVANTAGE - The adhesive improves fast charging performance of lithium ion batteries. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing the cathode adhesive, comprising (i) using monomer A includes butadiene, styrene and functional monomers, and where the mass ratio of butadiene and styrene ranges from 1:10-1:1, functional monomer accounts for 0-20 wt.% of the mass of monomer A, amount of initiator is 0.01-1 wt.% of the mass of monomer A, amount of emulsifier and monomer A is 0.05-3.5 wt.% of the mass of monomer A, stirring in deionized water for free radical copolymerization, polymerizing at 40-90 degrees C under pressure of 0.3-1.2 MPa for 2-12 hours to obtain styrene-butadiene copolymer emulsion to obtain material to obtain organic core, (ii) reacting hydrated oxide sol and the silane coupling agent, where the amount of silane coupling agent is 1-15 wt.% of the solid mass of the hydrated oxide sol, reacting at 40-80 degrees C for 4-12 hours to obtain modified hydrated oxide sol, (iii) using monomer B including butadiene and styrene, and where the mass ratio of butadiene to styrene ranges from 1:10-1:2, amount of initiator is 0.01-1 wt.% of the mass of monomer B, emulsifier with a dosage of 0.05-3.5 wt.% of the mass of monomer B, adding monomer B and the modified hydrated oxide sol into deionized water and stirring to obtain pre-emulsion C, and(iv) adding the pre-emulsion liquid C to the styrene-butadiene copolymer emulsion in step (i), continuously stirring and reacting at 40-90 degrees C for 2-12 hours to obtain an organic-inorganic composite emulsion with core-shell structure, namely the cathode adhesive; (2) preparing cathode sheet using the cathode adhesive, comprising (i) mixing the cathode active material, conductive agent, dispersant and cathode adhesive to obtain mixture M, and gradually adding the mixture M to deionized water for grinding to obtain uniformly mixed cathode slurry, and(ii) adjusting the solid content of the cathode slurry to 50%, uniformly coating the cathode slurry on the surface of the current collector, drying and compacting to obtain cathode sheet; and (3) lithium ion battery, comprising anode sheet, cathode sheet, diaphragm and electrolyte, where the cathode sheet comprises cathode adhesive.