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Batteries 2017, 3(1), 6;

Fabrications of High-Capacity Alpha-Ni(OH)2

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
Shenzhen Highpower Technology Co., Luoshan Industrial Zone, Pinhu, Longgang, Shenzhen 518111, Guangdong, China
College of Chemistry and Chemical Engineering, Central South University, South Lushan Road, Changsha 410083, Hunan, China
Author to whom correspondence should be addressed.
Academic Editor: Hua Kun Liu
Received: 10 January 2017 / Revised: 23 February 2017 / Accepted: 2 March 2017 / Published: 8 March 2017
(This article belongs to the Special Issue Nickel Metal Hydride Batteries 2017)
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Three different methods were used to produce α-Ni(OH)2 with higher discharge capacities than the conventional β-Ni(OH)2, specifically a batch process of co-precipitation, a continuous process of co-precipitation with a phase transformation step (initial cycling), and an overcharge at low temperature. All three methods can produce α-Ni(OH)2 or α/β mixed-Ni(OH)2 with capacities higher than that of conventional β-Ni(OH)2 and a stable cycle performance. The second method produces a special core–shell β-Ni(OH)2/α-Ni(OH)2 structure with an excellent cycle stability in the flooded half-cell configuration, is innovative and also already mass-production ready. The core–shell structure has been investigated by both scanning and transmission electron microscopies. The shell portion of the particle is composed of α-Ni(OH)2 nano-crystals embedded in a β-Ni(OH)2 matrix, which helps to reduce the stress originating from the lattice expansion in the β-α transformation. A review on the research regarding α-Ni(OH)2 is also included in the paper. View Full-Text
Keywords: alpha nickel hydroxide; continuous stirring single reactor process; core–shell structure; nickel metal hydride battery alpha nickel hydroxide; continuous stirring single reactor process; core–shell structure; nickel metal hydride battery

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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.; Wang, L.; Yan, S.; Liao, X.; Meng, T.; Shen, H.; Mays, W.C. Fabrications of High-Capacity Alpha-Ni(OH)2. Batteries 2017, 3, 6.

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