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.
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1. A porous separator for an electrochemical cell, the separator comprising: (a) an inorganic oxide layer comprising aluminum boehmite; and(b) an organic polymer comprising organic polymer substituents,wherein the organic polymer substituents are covalently bonded to the aluminum boehmite. 2. The se
1. A porous separator for an electrochemical cell, the separator comprising: (a) an inorganic oxide layer comprising aluminum boehmite; and(b) an organic polymer comprising organic polymer substituents,wherein the organic polymer substituents are covalently bonded to the aluminum boehmite. 2. The separator of claim 1, wherein the organic polymer substituents are a reaction product of aluminum boehmite and an organic polymer, and wherein the organic polymer is selected from the group consisting of polyvinyl alcohols, polyethylene oxides, polyvinyl pyrrolidones, and cellulosic polymers. 3. The separator of claim 2, wherein the organic polymer is a polyethylene oxide. 4. The separator of claim 1, wherein the separator does not melt at temperatures lower than 300° C. 5. The separator of claim 1, wherein the separator has a tensile strength between about 100 kg/cm2 to about 500 kg/cm2 at 2 percent elongation. 6. The separator of claim 1, wherein the separator has an elastic modulus between about 30,000 kg/cm2 to about 70,000 kg/cm2. 7. The separator of claim 1, wherein the thickness of the inorganic oxide layer is from 2 microns to 25 microns. 8. The separator of claim 1, wherein the separator is nanoporous. 9. The separator of claim 1, wherein the average pore diameter of the separator is 30 nm to 50 nm. 10. The separator of claim 1, wherein the separator comprises an aluminum boehmite xerogel layer. 11. An electrochemical cell comprising an anode,a cathode, anda separator interposed between said anode and said cathode, the separator comprising an inorganic oxide layer comprising aluminum boehmite and an organic polymer comprising organic polymer substituents, wherein the organic polymer substituents are covalently bonded to the aluminum boehmite. 12. The electrochemical cell of claim 11, wherein the organic polymer substituents are a reaction product of aluminum boehmite and an organic polymer, and wherein and the organic polymer is selected from the group consisting of polyvinyl alcohols, polyethylene oxides, polyvinyl pyrrolidones, and cellulosic polymers. 13. The electrochemical cell of claim 12, wherein the organic polymer is a polyethylene oxide. 14. The electrochemical cell of claim 11, wherein the separator does not melt at temperatures lower than 300° C. 15. The electrochemical cell of claim 11, wherein the separator has a tensile strength between about 100 kg/cm2 to about 500 kg/cm2 at 2 percent elongation. 16. The electrochemical cell of claim 11, wherein the separator has an elastic modulus between about 30,000 kg/cm2 to about 70,000 kg/cm2. 17. The electrochemical cell of claim 11, wherein the thickness of the inorganic oxide layer is from 2 microns to 25 microns. 18. The electrochemical cell of claim 11, wherein the separator is nanoporous. 19. The electrochemical cell of claim 11, wherein the average pore diameter of the separator is from 30 nm to 50 nm. 20. The electrochemical cell of claim 11, wherein the separator comprises an aluminum boehmite xerogel layer. 21. The electrochemical cell of claim 11, wherein the anode comprises lithium as an anode active material. 22. The electrochemical cell of claim 11, wherein the cell is a secondary cell. 23. The electrochemical cell of claim 11, wherein the cell is a lithium ion secondary cell. 24. An electrochemical cell comprising: an anode,a cathode,and a separator interposed between the anode and the cathode, the separator comprising:an inorganic oxide layer comprising aluminum boehmite, andan organic polymer comprising organic polymer substituents,wherein the organic polymer is a polyethylene oxide and the substituents are covalently bonded to the aluminum boehmite. 25. The electrochemical cell of claim 24, wherein the separator does not melt at temperatures lower than 300° C. 26. The electrochemical cell of claim 24, wherein the separator has a tensile strength between about 100 kg/cm2 to about 500 kg/cm2 at 2 percent elongation. 27. The electrochemical cell of claim 24, wherein the separator has an elastic modulus between about 30,000 kg/cm2 to about 70,000 kg/cm2.
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