Lithium-supplementing additive, preparation method therefor, and application thereof

Abstract

Provided is a lithium-supplementing additive comprising α-phase lithium nitride and/or β-phase lithium nitride. According to the lithium-supplementing additive provided by the present application, the comprised pure α-phase lithium nitride has high lithium ion conductivity, thereby facilitating the de-intercalation of lithium ions; the comprised pure β-phase lithium nitride has a high energy barrier for lithium-ion mobility and a high decomposition voltage, so that the mobility of lithium ions in a battery system is more stable; and the comprised mixed-phase lithium nitride has reduced activity and can be prevented from reacting with widely used N-methylpyrrolidone (NMP) and polyvinylidene fluoride (PVDF) during a homogenizing process, and thus has good stability.

Dependencies are inferred from the claim text.