Ionically conductive membranes for protection of active metal anodes and battery cells

Abstract

Disclosed are ionically conductive membranes for protection of active metal anodes and methods for their fabrication. The membranes may be incorporated in active metal negative electrode (anode) structures and battery cells. In accordance with the invention, the membrane has the desired properties of high overall ionic conductivity and chemical stability towards the anode, the cathode and ambient conditions encountered in battery manufacturing. The membrane is capable of protecting an active metal anode from deleterious reaction with other battery components or ambient conditions while providing a high level of ionic conductivity to facilitate manufacture and/or enhance performance of a battery cell in which the membrane is incorporated.

1 . An electrochemical device component, comprising: 
 an active metal electrode having a first surface and a second surface; and    a protective membrane on the first surface of the electrode and having a smooth gap-free interface therewith, the membrane being ionically conductive and chemically compatible with the active metal on a side in contact with the active metal electrode, and substantially impervious, ionically conductive and chemically compatible with active metal corrosive environments on the other side;    wherein the ionic conductivity of the membrane is at least 10 −7  S/cm.    
   
   
       2 . The component of  claim 1 , wherein the protective membrane comprises a composite, the composite comprising, 
 a first material in contact with the electrode, the first material being ionically conductive and chemically compatible with the active metal; and    a second material in contact with the first material, the second material being substantially impervious, ionically conductive and chemically compatible with the first material and active metal corrosive environments;    wherein the ionic conductivity of the composite is at least 10 −7  S/cm.    
   
   
       3 - 43 . (canceled)