Damage in Composite NiMH Positive Electrodes

[+] Author and Article Information
A. M. Sastry, S. B. Choi, X. Cheng

Department of Mechanical Engineering, and Applied Mechanics, The University of Michigan, Ann Arbor, MI 48109-2125

J. Eng. Mater. Technol 120(4), 280-283 (Oct 01, 1998) (4 pages) doi:10.1115/1.2807013 History: Received September 18, 1997; Revised February 09, 1998; Online November 27, 2007


Mechanical degradation in fibrous composite electrodes in use in NiMH(nickel metal hydride) batteries is being studied. NiMH cells exhibit failure in the positive plate due to swelling induced during the electrochemical reaction, which leads to gradual breakdown of the connectivity of the substrate microstructure. Particularly, loss of electrical conductivity as related to losses in mechanical properties upon cell cycling (constant current cycles with substantial overcharge) are being investigated experimentally. These properties are measured for the dry substrate material before and after battery cycling, and the losses observed suggest key tradeoffs between use of higher density nickel substrates and improved energy densities using mechanical and resistivity proof tests.

Copyright © 1998 by The American Society of Mechanical Engineers
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