▎ 摘　　要

NOVELTY - Lithium ion battery negative electrode sheet comprises current collector, first active layer and second active layer, and second active layer disposed between current collector and first active layer. The contact angle between first active layer and non-aqueous solvent is theta 1, and its porosity is a. The contact angle of second active layer with the non-aqueous solvent is theta 2, and its porosity is b, so 100 less than ( 1/a) less than ( 2/b) less than 450. USE - Lithium ion battery negative electrode sheet. ADVANTAGE - The Lithium ion battery negative electrode sheet has large silicon expansion in the charging and discharging process, which is good for improving the porosity of surface pole piece, so as to improve the liquid holding amount of the battery. Because the silicon surface contains more functional groups, particles are less than graphite particles, which can notably improve the energy density of the battery, liquid retention and cycle life.