A composite Li.sub.1+xMn.sub.2-x-yM.sub.yO.sub.4 cathode material stabilized by treatment with a second transition metal oxide phase that is highly suitable for use in high power and energy density Li-ion cells and batteries. A method for treating a Li.sub.1+xMn.sub.2-x-yM.sub.yO.sub.4 cathode material utilizing a dry mixing and firing process.
FEDERALLY SPONSORED RESEARCH
The invention was made under support of the United States Government, Department of Energy, Small Business Innovative Research Grant Number DE-FG02-03ER83868. The United States has certain rights in the invention.