Multi-functionally Modified Polymer Binder for Lithium Ion Batteries and Use Thereof in Electrochemical Energy Storage Devices

A multi-functionally modified polymer binder for lithium ion batteries, characterized in that, the binder is prepared by a free radical graft copolymerization or a Michael addition reaction, with a biomass polymer or a synthetic polymer as a substrate, and a hydrophilic monomer and a lipophilic monomer as functionally modifying monomers;

• the binder has a molecular weight of 10000-1500000, a solids content of 1-50 wt % and a viscosity of 1-50000 mPa·s;
• the biomass polymer is selected from one or more of arabic gum, cyclodextrin, cellulose derivative, xanthan gum, pectin, gelatin, starch, and sesbania gum;
• the synthetic polymer is selected from one or more of polyethyleneimine, polyethylene glycol and polyhydroxy polybutadiene;
• the hydrophilic monomer is selected from at least one of monomers having a structure of CH2═CR1R2, wherein R1 is selected from —H, —CH3 and —CH2CH3, and R2 is selected from —COOH, —COOM and —CONH2, wherein M is selected from Li, Na or K;
• the lipophilic monomer is selected from at least one of monomers having a structure of CH2═CR3R4, wherein R3 is selected from —H, —CH3 and —CH2CH3, and R4 is selected from at least one of —CN, —OCOCH3, —CONHCH3, —CON(CH3)2, —CH═CH2, —Ph-R5 and —COOR6, wherein R5 is —H or any substituent other than —H, and R6 is selected from at least one of C1-C8 alkyl groups;
• a weight ratio of the biomass polymer or the synthetic polymer, the hydrophilic monomer and the lipophilic monomer is 1:0-100:0-100.