POSITIVE ELECTRODE FOR SECONDARY BATTERY, METHOD FOR PRODUCING THE SAME, AND NONAQUEOUS SECONDARY BATTERY

摘要

A positive electrode active material layer comprises a coating layer for coating at least part of surfaces of positive electrode active material particles. The coating layer comprises alternate layers of a cationic material layer containing a cationic material having a positive zeta potential and an anionic material layer containing an anionic material having a negative zeta potential under neutral conditions, and a material layer having a zeta potential of opposite sign to that of the positive electrode active material particles is bonded to the surfaces of the positive electrode active material particles. The coating layer is thin and uniform, and has a high strength for bonding to the positive electrode active material particles, so the coating layer suppresses direct contact of the positive electrode active material particles and an electrolytic solution even when a nonaqueous secondary battery is used at a high voltage.

主权项

1. A positive electrode for a secondary battery, comprising a current collector and a positive electrode active material layer bonded to the current collector, characterized in that
said positive electrode active material layer comprises positive electrode active material particles, a bonding portion for bonding the positive electrode active particles with each other and bonding the positive electrode active material particles with the current collector, and a coating layer for coating at least part of surfaces of at least the positive electrode active material particles, said coating layer comprises alternate layers of a cationic material layer containing a cationic material having a positive zeta potential under neutral conditions and an anionic material layer containing an anionic material having a negative zeta potential under neutral conditions, and a material layer having a zeta potential of opposite sign to that of said positive electrode active material particles is bonded to surfaces of said positive electrode active material particles.