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Batteries 2016, 2(1), 3;

Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries

Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
BASF/Battery Materials-Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
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)
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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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Young, K.-H.; Yasuoka, S. Capacity Degradation Mechanisms in Nickel/Metal Hydride Batteries. Batteries 2016, 2, 3.

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