NEGATIVE ELECTRODE FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERIES AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

Provided is a non-aqueous electrolyte secondary battery that exhibits less expansion/contraction during charging/discharging and better capacity retention (cycle characteristics) than batteries in which a negative electrode comprising only a negative electrode active substance that alloys with lithium is used. A negative electrode (20) for non-aqueous electrolyte secondary battery according to one aspect of the present invention has a negative electrode mixture layer (22) which is formed upon a collector and which comprises a binder and negative electrode active substance particles that alloy with lithium. The negative electrode mixture layer (22) has pillar sections (22b). If the total area of the pillar sections (22b) in the planar view is S1 and the total area of one surface of the negative electrode collector in the planar view is S2, then the value of S1/S2 is 0.46-0.58.