Electrochemical energy storage devices and components

Abstract

A battery electrode composition is provided comprising anode and cathode electrodes and an electrolyte ionically coupling the anode and the cathode. At least one of the electrodes may comprise a plurality of active material particles provided to store and release ions during battery operation. The electrolyte may comprise an aqueous metal-ion electrolyte ionically interconnecting the active material particles. Further, the plurality of active material particles may comprise a conformal, metal-ion permeable coating at the interface between the active material particles and the aqueous metal-ion electrolyte. The conformal, metal-ion permeable coating impedes water decomposition at the aforesaid at least one of the electrodes.

What is claimed is: 
     
         1 . A metal-ion battery composition, comprising:
 anode and cathode electrodes, wherein at least one of the electrodes comprises a plurality of active material particles provided to store and release ions during battery operation; and   an electrolyte ionically coupling the anode and the cathode, wherein the electrolyte comprises an aqueous metal-ion electrolyte ionically interconnecting the active material particles,   wherein the plurality of active material particles comprises a conformal, metal-ion permeable coating at the interface between the active material particles and the aqueous metal-ion electrolyte, whereby the conformal, metal-ion permeable coating impedes water decomposition at the at least one of the electrodes.