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METAL HYDRIDE ALLOYS WITH IMPROVED RATE PERFORMANCE

United States Patent Application

20160344022
A1
View the Complete Application at the US Patent & Trademark Office
Methods of preparing improved metal hydride alloy materials are provided. The alloys include a mixture of at least four of vanadium, titanium, nickel, chromium, and iron. The alloy is processed by at least one of thermal and physical treatment to generate a refined microstructure exhibiting improved kinetics when used as electrodes in MH batteries (e.g., higher discharge current). The thermal treatment includes rapid cooling of the alloy at greater than 10.sup.4K/s. The physical treatment includes mechanical pulverization of the alloy after cooling. The microstructure is a single phase (body centered cubic) with a heterogeneous composition including a plurality of primary regions having a lattice parameter selected from the range of 3.02 .ANG. to 3.22 .ANG. and a plurality of secondary regions having a lattice parameter selected from the range of 3.00 .ANG. to 3.22 .ANG. and at least one physical dimension having a maximum average value less than 1 .mu.m.
WEADOCK, Nicholas J. (Pasadena, CA), TAN, Hongjin (Pasadena, CA), FULTZ, Brent T. (Pasadena, CA), YANG, Heng (Pasadena, CA)
15/ 046,104
February 17, 2016
GOVERNMENT SUPPORT [0002] This invention was made with government support under Grant No. ARPA-E awarded by DARPA. The government has certain rights in the invention. [0003] The invention described herein was made in the performance of work under a NASA contract NNN12AAO1C, and is subject to the provisions of Public Law 96-517 (35 USC 102) in which the Contractor has elected to retain title. [0004] This invention was made with government support under Award Number DE-SC0001057 as a part of EFree (Energy Frontier Research in Extreme Environments), an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Basic Energy Sciences. The government has certain rights in the invention.