Lithium manganese oxide cathodes with high capacity and stability

摘要

A method for reducing capacity fading of an LiMn2O4 spinel electrode active material comprising substituting a minor amount of Z for Mn in the LiMn2O4 active material, where Z is a metal element having a +4 (IV) valence state and is characterized by an ability to form tetravalent chlorides. The Z substituted LiMn2O4 active material is further characterized by a lesser rate of capacity loss with cycling as compared to LiMn2O4 active material.