Negative electrode and battery

The utility model relates to a negative electrode and a battery, the negative electrode comprises a battery material, the battery material is a core-shell structure, the core-shell structure comprises a core and a shell, and the shell is located at the periphery of the core. The core is a silicon-based material core. The shell comprises a polymer shell, the polymer shell is a straight chain, the polymer shell comprises a first structure and a second structure, the first structure comprises a siloxane group structure, and the second structure comprises a carboxyl group structure or an ester group structure. The first structure is closer to the core than the second structure. And when specific conditions are met, the safety and the cycle life of the battery can be improved. 一种负极与电池，负极包含一电池材料，电池材料为一核壳结构，核壳结构包含一核以及一壳，壳位于核的外围。核为一硅系材料核。壳包含一聚合物壳，聚合物壳为直链，聚合物壳包含一第一结构与一第二结构，第一结构包含硅氧烷基团结构，第二结构包含羧基基团结构或酯基基团结构。第一结构较第二结构靠近核。当满足特定条件时，有助于提升电池的安全性以及循环寿命。