POSITIVE ELECTRODE FOR RECHARGEABLE BATTERY WITH NONAQUEOUS ELECTROLYTE, AND RECHARGEABLE BATTERY WITH NONAQUEOUS ELECTROLYTE

摘要

A construction is adopted in which not less than 80% by weight of the total amount of a positive electrode active material contained in a positive electrode active material layer is in the form of primary particles and an electroconductive covering layer is provided on the surface of the primary particles. This construction can satisfactorily suppress disintegration of the active material upon the repetition of charge/discharge and a change in volume of the active material layer involved in this phenomenon, without causing a significant increase in electroconductive agent content in the positive electrode active material layer. In particular, care is taken so that a part of particles of the positive electrode active material is not isolated from an electroconductive network in the positive electrode active material. As a result, the electroconductive network which has been strongly formed among primary particles is kept, and, thus, output properties and service life properties can be simultaneously realized on a high level, contributing to high output and prolonged service life of the battery.