Provided are separators for use in an electrochemical cell comprising (a) an inorganic oxide and (b) an organic polymer, wherein the inorganic oxide comprises organic substituents. Also provided are electrochemical cells comprising such separators.
STATEMENT OF GOVERNMENT RIGHTS
 This invention was made with government support under Grant Number DE-FG02-02ER83542 awarded by the U.S. Department of Energy. The government may have certain rights in the invention.