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Batteries 2016, 2(1), 3; doi:10.3390/batteries2010003

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

1
Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
2
BASF/Battery Materials-Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
3
FDK Corporation, 307-2 Koyagimachi, Takasaki 370-0071, Gunma, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Andreas Jossen
Received: 30 December 2015 / Revised: 5 February 2016 / Accepted: 17 February 2016 / Published: 1 March 2016
(This article belongs to the Special Issue Nickel Metal Hydride Batteries)
View Full-Text   |   Download PDF [691 KB, uploaded 1 March 2016]   |  

Abstract

The consistency in capacity degradation in a multi-cell pack (>100 cells) is critical for ensuring long service life for propulsion applications. As the first step of optimizing a battery system design, academic publications regarding the capacity degradation mechanisms and possible solutions for cycled nickel/metal hydride (Ni/MH) rechargeable batteries under various usage conditions are reviewed. The commonly used analytic methods for determining the failure mode are also presented here. The most common failure mode of a Ni/MH battery is an increase in the cell impedance due to electrolyte dry-out that occurs from venting and active electrode material degradation/disintegration. This work provides a summary of effective methods to extend Ni/MH cell cycle life through negative electrode formula optimizations and binder selection, positive electrode additives and coatings, electrolyte optimization, cell design, and others. Methods of reviving and recycling used/spent batteries are also reviewed. View Full-Text
Keywords: nickel/metal hydride (Ni/MH) battery; failure analysis; electrochemistry; hydrogen storage alloys; self discharge; capacity degradation nickel/metal hydride (Ni/MH) battery; failure analysis; electrochemistry; hydrogen storage alloys; self discharge; capacity degradation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Young, K.-H.; Yasuoka, S. Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries. Batteries 2016, 2, 3.

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