NONAQUEOUS SECONDARY BATTERY

摘要

A nonaqueous secondary battery comprising a positive electrode which has a positive electrode active material layer containing Li(LixMn2xCo1-3x)O2 wherein x represents 0<x<⅓, and a negative electrode which has a negative electrode active material layer containing Si or Sn. The amounts of the active materials are preferably such that the ratio of the theoretical capacity of the negative electrode to the capacity of the positive electrode at a cut-off voltage in a first and subsequent charging operations is 1.1 to 3.0. The battery preferably has lithium corresponding to 9% to 50% of the theoretical capacity of the negative electrode accumulated in the negative electrode.