Metal hydride cells having improved cycle life and charge retention
AssigneeOvonic Battery Company, Inc.
InventorsMichael A. Fetcenko, Stanford R. Ovshinsky
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Abstract
A rechargeable hydrogen storage cell comprising: a negative electrode having the composition: (Ovonic Base Alloy).sub.a M.sub.b where Ovonic Base Alloy represents an Ovonic alloy that contains 0.1 to 60 atomic percent Ti, 0.1 to 25 atomic percent Zr, 0.1 to 60 atomic percent V, 0.1 to 57 atomic percent Ni, and 0.1 to 56 atomic percent Cr, as described above; a is at least 70 atomic percent; M represents at least one modifier chosen from the group consisting of Co, Mn, Al, Fe, W, La, Mo, Cu, Mg, Ca, Nb, Si, and Hf; b is 0 to 30 atomic percent; b>0; and a+b=100 atomic percent; a positive electrode; and a separator of electrolyte retentive nylon or wettable polypropylene.
Claims22
A rechargeable hydrogen storage cell comprising:
- a negative electrode having the following composition:
- (Ovonic Base Alloy).sub.a M.sub.b
- where
- Ovonic Base Alloy represents an Ovonic alloy that contains 0.1 to 60 atomic percent Ti, 0.1 to 25 atomic percent Zr, 0.1 to 60 atomic percent V, 0.1 to 57 atomic percent Ni, and 0.1 to 56 atomic percent Cr, as described above;
- a is at least 70 atomic percent;
- M represents at least one modifier chosen from the group consisting of Co, Mn, Al, Fe, W, La, Mo, Cu, Mg, Ca, Nb, Si, and Hf;
- b is 0 to 30 atomic percent;
- b>0;
- and
- a+b=100 atomic percent;
- a positive electrode;
- and
- a separator chosen from the group consisting of
- an electrolyte retentive, fine fiber, having a thickness of approximately 5-12 microns nylon separator and a wettable polypropylene separator resistant to reaction with H.sub.2 gas and alkaline electrolyte,
- where the surface of said wettable polypropylene has been treated using radiation grafting or a chemical treatment.
Dependencies are inferred from the claim text.