SURFACE MODIFICATION OF ELECTRODE MATERIALS

摘要

A negative electrode active material comprising titanium, for example lithium titanate, includes an inorganic aluminum phosphate surface layer in direct conformal contact. The aluminum phosphate layer may be covalently bound to surface structures of the negative electrode active material. A Li-ion cell comprising the surface-treated electrode active material may provide an improved cycle life and survival at high temperature as compared to Li-ion cells comprising LTO with no surface treatment, wherein the surface layer may form Li1+xAlxTi2-x(PO4)3 structures upon battery cycling.