A lithium-ion battery additive and its preparation method, positive electrode slurry, positive electrode sheet and lithium battery

Abstract

This invention relates to the field of lithium-ion battery technology, and more particularly to a lithium-ion battery additive and its preparation method, a positive electrode slurry, a positive electrode sheet, and a lithium battery. The preparation materials, by weight percentage, include: 10-20% of a first dispersant, 5-15% of a second dispersant, 5-15% of a stabilizer, 1% of an antifoaming agent, and solvent to make up the balance; the first dispersant is a C6-C dispersant containing at least one acidic hydroxyl group. 16 The first dispersant comprises phosphate ester compounds; the second dispersant includes at least one of polyetheramine with a number average molecular weight of 2000-4000 and polyethyleneimine ethoxylate with a number average molecular weight of 10000-15000. This invention, through the selection of specific raw materials, prepares a lithium-ion battery additive for lithium replenishment systems that not only effectively solves the problems of low solid content, easy gelation, and poor stability in the positive electrode slurry of lithium replenishment systems, but also reduces electrode resistance, reduces battery polarization, and improves the capacity utilization of the lithium replenishment agent.

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