Cathode lithium-supplementing additive, preparation method therefor and application thereof

Abstract

The present application discloses a cathode lithium-supplementing additive, and a preparation method therefor and an application thereof. The cathode lithium-supplementing additive of the present application is of a core-shell structure, a core of the core-shell structure comprises a cathode lithium-supplementing material, and a coating layer covering the core comprises a piperidine group-containing polymer. The polymer used in the cathode lithium-supplementing additive of the present application imparts the effect of inhibiting active oxygen and the effect of capturing a free radical generated during charging and discharging of a lithium ion battery to the coating layer, such that the amount of gas generated in the charging and discharging process of the lithium ion battery is obviously reduced, and the volume expansion of the lithium ion battery is reduced.

Dependencies are inferred from the claim text.