POSITIVE ACTIVE MATERIAL FOR LITHIUM-ION SECONDARY BATTERY

摘要

The present invention addresses the problem of providing a positive active material with which it is possible to attain an improvement in charge/discharge potential and an increase in energy density. The problem can be solved with a positive active material for lithium-ion secondary batteries which is represented by the empirical formula xLi2MnO3-(1-x)LiNiaMnbO2 [wherein x, a, and b are numbers satisfying the following relationships: 0.2