A Ni/MH Pouch Cell with High-Capacity Ni(OH)2
1
BASF/Battery Materials—Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
2
Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
*
Author to whom correspondence should be addressed.
Batteries 2017, 3(4), 38; https://doi.org/10.3390/batteries3040038
Received: 26 September 2017
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Revised: 16 November 2017
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Accepted: 21 November 2017
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Published: 4 December 2017
(This article belongs to the Special Issue Nickel Metal Hydride Batteries 2017)
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.
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Keywords:
metal hydride alloy; nickel metal hydride battery; pouch cell; electrochemistry; alpha nickel hydroxide; core shell
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MDPI and ACS Style
Yan, S.; Meng, T.; Young, K.-H.; Nei, J. A Ni/MH Pouch Cell with High-Capacity Ni(OH)2. Batteries 2017, 3, 38. https://doi.org/10.3390/batteries3040038
AMA Style
Yan S, Meng T, Young K-H, Nei J. A Ni/MH Pouch Cell with High-Capacity Ni(OH)2. Batteries. 2017; 3(4):38. https://doi.org/10.3390/batteries3040038
Chicago/Turabian StyleYan, Shuli, Tiejun Meng, Kwo-Hsiung Young, and Jean Nei. 2017. "A Ni/MH Pouch Cell with High-Capacity Ni(OH)2" Batteries 3, no. 4: 38. https://doi.org/10.3390/batteries3040038
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