NEGATIVE ELECTRODE FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

A negative electrode (10) for use in a non-aqueous electrolyte secondary battery comprises an active material layer (12) containing a particle (12a) of an active material. At least a part of the surface of the particle (12a) is coated with a metal material (13) having a poor ability of forming a lithium compound. A void is formed between the particles (12a) that are coated with the metal material (13). When the active material layer (12) is imaginarily divided into two equal parts in the thickness-wise direction, the amount of the metal material (13) in a part located nearer the surface of the negative electrode is smaller than that in a part located farther from the surface of the negative electrode.In the imaginarily divided active material layer (12), it is preferred that the weight-based [particle (12a)/metal material (13)] ratio in a part located nearer the surface of the negative electrode is larger than that in a part located farther from the surface of the negative electrode