Negative electrode sheet, method for manufacturing the same, and lithium battery

Abstract

The application discloses a negative electrode sheet and a preparation method thereof, and a lithium battery. The negative electrode sheet comprises: a current collector; a buffer layer located on at least one side of the current collector along the thickness direction of the negative electrode sheet and attached to the current collector, wherein the buffer layer comprises a buffer layer binder and a buffer layer conductive agent, the buffer layer binder comprises at least one of modified polyimide, polyacrylic acid, sodium carboxymethyl cellulose and butadiene styrene rubber, and the buffer layer conductive agent comprises at least one of carbon black, multi-walled carbon nanotubes and single-walled carbon nanotubes; and an active layer located on the side of the buffer layer away from the current collector along the thickness direction and attached to the surface of the buffer layer. Through the buffer layer comprising specific materials, the volume expansion of the negative electrode sheet in the cyclic charging and discharging process can be fully adapted, the interface bonding between the structures of the negative electrode sheet is enhanced, the stability of the negative electrode sheet is ensured, and the cycle stability of the battery is improved.

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