NONAQUEOUS ELECTROLYTE SECONDARY CELL

摘要

A nonaqueous electrolyte secondary cell comprising a positive electrode, a negative electrode including a negative active material, and a nonaqueous electrolyte, characterized in that the negative active material comprises composite particles (C) composed of particles (A) containing silicon and a conductivity imparting material (B) and a carbonaceous material (D), and the weight of the conductivity imparting material (B) ranges from 0.5 weight% to 60 weight% based on the weight of the composite particles (C). Since the negative active material comprises silicon that leads to a large discharge capacity, the nonaqueous electrolyte secondary cell has a large discharge capacity. Further, since the negative active material comprises the conductivity imparting material (B) and the carbonaceous material (D), the contact conductivity between particles (A) containing silicon or that of the negative active material are improved, thereby providing a nonaqueous electrolyte secondary cell having favorable cycle characteristics.