NONAQUEOUS ELECTROLYTE SECONDARY CELL, METHOD FOR MANUFACTURING THE SAME, AND CARBONACEOUS MATERIAL COMPOSITION

摘要

A rechargeable nonaqueous electrolyte secondary cell having a positive plate which can be doped/dedoped with/of lithium ions, a nonaqueous electrolyte, and a negative electrode. The negative plate active material is a carbonaceous one containing at least two components: (a) flaky graphite particles and (b) nonflaky graphite material whose surface is covered with amorphous carbon. The secondary cell has a high capacity and an excellent charging/discharging efficiency.