Ca3(PO4)2 coating of spherical Ni(OH)2 cathode materials for Ni–MH batteries at elevated temperature
Ca3(PO4)2 coating of spherical Ni(OH)2 cathode materials for Ni–MH batteries at elevated temperature
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DOI：
10.1016/j.electacta.2006.01.009
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发表时间：
2006-06
影响因子：
6.6
通讯作者：
Xiangming He;J. Ren;Wen Li;Changyin Jiang;C. Wan
中科院分区：
文献类型：
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作者：
Xiangming He;J. Ren;Wen Li;Changyin Jiang;C. Wan
为提高球形氢氧化镍的高温性能，首次将磷酸钙用于球形氢氧化镍的表面改性，以改善其高温性能。采用先在球形氢氧化镍表面沉积Ca3(PO4)2，再在球形氢氧化镍表面沉积Co(OH)2的方法制备了Ca3(PO4)2和Co(OH)2包覆氢氧化镍。钙的最佳包覆量约为2%(原子浓度)，以获得25℃和60℃的高放电容量。结果表明，Ca3(PO4)2和氢氧化钴的包覆提高了氢氧化镍的高温放电容量。研究了以Ca/Co涂层氢氧化镍为正极的AA型密封氢化镍电池的高温性能，结果表明，密封AA型氢化镍电池的高温性能明显优于未涂层或只有Co(OH)2涂层的氢氧化镍电极。使用2%钙和2%钴包覆氢氧化镍的电池在60℃时充电接受率达到81%。C，其中未包覆和只包覆Co(OH)2的氢氧化镍的电荷接受率分别只有42%和48%。结果表明，Ca/Co涂层是改善镍氢电池用氢氧化镍高温性能的有效途径。由于其价格低廉，有望成为电动汽车用MH-Ni电池的正极材料
Calcium phosphate was used for surface modification of spherical nickel hydroxide to improve its high temperature performance at the first time due to its low cost. The Ca3 (PO4) 2 and Co (OH) 2 coated nickel hydroxides were prepared by precipitation of Ca3 (PO4) 2 on the surface of spherical nickel hydroxide, followed by precipitation of Co (OH) 2 on its surface. The optimum coating content of calcium was around 2%(atomic concentration) to obtain high discharge capacity both at 25 and 60 deg. C. It was shown that the discharge capacity of nickel hydroxide at higher temperatures was improved by coating of Ca3 (PO4) 2 and cobalt hydroxide. The high temperature performances of the sealed AA-sized nickel-metal hydride (Ni-MH) batteries using Ca/Co coated nickel hydroxide as positive electrodes were carried out, showing much better than those using uncoated or only Co (OH) 2 coated nickel hydroxide electrodes. The charge acceptance of the battery using 2% Ca and 2% Co coated nickel hydroxide reached 81% at 60 deg. C, where the charge acceptances for uncoated and only Co (OH) 2 coated nickel hydroxide were only 42 and 48%, respectively. It has shown that the Ca/Co coating is an effective way to improve the high temperature performance of nickel hydroxide for nickel-metal hydride batteries. It is a promising cathode material of Ni-MH batteries for EV applications due to the cost