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Batteries 2017, 3(4), 38;

A Ni/MH Pouch Cell with High-Capacity Ni(OH)2

BASF/Battery Materials—Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
Author to whom correspondence should be addressed.
Received: 26 September 2017 / Revised: 16 November 2017 / Accepted: 21 November 2017 / Published: 4 December 2017
(This article belongs to the Special Issue Nickel Metal Hydride Batteries 2017)
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Electrochemical performances of a high-capacity and long life β-α core-shell structured Ni0.84Co0.12Al0.04(OH)2 as the positive electrode active material were tested in a pouch design and compared to those of a standard β-Ni0.91Co0.045Zn0.045(OH)2. The core-shell materials were fabricated with a continuous co-precipitation process, which created an Al-poor core and an Al-rich shell during the nucleation and particle growth stages, respectively. The Al-rich shell became α-Ni(OH)2 after electrical activation and remained intact through the cycling. Pouch cells with the high-capacity β-α core-shell positive electrode material show higher charge acceptances and discharge capacities at 0.1C, 0.2C, 0.5C, and 1C, improved self-discharge performances, and reduced internal and surface charge-transfer resistances, at both room temperature and −10 °C when compared to those with the standard positive electrode material. While the high capacity of the core-shell material can be attributed to the α phase with a multi-electron transfer capability, the improvement in high-rate capability (lower resistance) is caused by the unique surface morphology and abundant interface sites at the β-α grain boundaries. Gravimetric energy densities of pouch cells made with the high-capacity and standard positive materials are 127 and 110 Wh·kg−1, respectively. A further improvement in capacity is expected via the continued optimization of pouch design and the use of high-capacity metal hydride alloy. View Full-Text
Keywords: metal hydride alloy; nickel metal hydride battery; pouch cell; electrochemistry; alpha nickel hydroxide; core shell metal hydride alloy; nickel metal hydride battery; pouch cell; electrochemistry; alpha nickel hydroxide; core shell

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Yan, S.; Meng, T.; Young, K.-H.; Nei, J. A Ni/MH Pouch Cell with High-Capacity Ni(OH)2. Batteries 2017, 3, 38.

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