SURFACE MODIFICATION OF ACTIVE MATERIAL STRUCTURES IN BATTERY ELECTRODES

摘要

Provided herein are methods of processing electrode active material structures for use in electrochemical cells or, more specifically, methods of forming surface layers on these structures. The structures are combined with a liquid to form a mixture. The mixture includes a surface reagent that chemically reacts and forms a surface layer covalently bound to the structures. The surface reagent may be a part of the initial liquid or added to the mixture after the liquid is combined with the structures. In some embodiments, the mixture may be processed to form a powder containing the structures with the surface layer thereon. Alternatively, the mixture may be deposited onto a current collecting substrate and dried to form an electrode layer. Furthermore, the liquid may be an electrolyte containing the surface reagent and a salt. The liquid soaks the previously arranged electrodes in order to contact the structures with the surface reagent.

主权项

1. A treated electrode active material structure comprising:
an electrode active material structure comprising a metal selected from the group comprising titanium and nickel; and a surface layer covalently bound to the electrode active material structure, the surface layer comprising siloxane, the surface layer reducing reactivity of the electrode active material structure with respect to electrolyte components.