NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

Disclosed is a nonaqueous electrolyte secondary battery comprising a negative electrode, a positive electrode and a nonaqueous electrolyte arranged between the electrodes. A negative electrode mix layer containing at least an active material capable of adsorbing and desorbing lithium ions is formed on at least one surface of a collector of the negative electrode. The negative electrode mix layer is provided with a plurality of parallel mix layer expansion adsorbing grooves in a position where the negative electrode mix layer faces the positive electrode mix layer, so that the collector is exposed from the grooves.