A study of nano-sized surface coating on LiMn 2O 4 materials

Abstract

The present study used the Pechini process with a heat treatment to synthesize LiMn 2O 4 powder (LMO). After surface coating, a nano-sized oxidative film of Li–Ni–Mn formed on the surface of the LMO–Ni powders. The concentration of Mn 3+ for the LMO–Ni powder was lower and the average electrovalence of Mn exceeded the theoretical value, resulting in the initial capacity of the LMO–Ni powder being lower than the LMO powder. However, the LMO–Ni powder with the Li/Ni film not only restrained Mn ions from dissolving into the electrolyte, but also improved the charge–discharge cycling capacity.