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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

表面包覆Yb(OH)3的球形氢氧化镍的高温性能研究

李稳, 姜长印, 万春荣   

  1. 清华大学核能与新能源技术研究院材料化学实验室, 北京 102201
  • 收稿日期:2004-12-01 修回日期:2005-01-11 出版日期:2006-01-20 网络出版日期:2006-01-20

High-temperature Performances of Spherical Nickel Hydroxide Coated with Yb(OH)3

LI Wen, JIANG Chang-Yin, WAN Chun-Rong   

  1. Materials Chemistry Lab, INET, Tsinghua University, Beijing 102201, China
  • Received:2004-12-01 Revised:2005-01-11 Published:2006-01-20 Online:2006-01-20

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摘要： 球形氢氧化镍的高温性能已经成为制约其应用于动力型MH-Ni电池的主要因素. 本文通过控制结晶的方法, 在?球形氢氧化镍表面包覆了一层Yb(OH)3, 并研究了不同包覆量对其常温和高温性能的影响. 研究结果表明: 表面包覆了Yb(OH)3的球形氢氧化镍, 其常温性能有所降低, 但是高温性能得到了很大的提高. 在60℃进行1C充放电条件下, 包覆量为2%(摩尔比)的球形氢氧化镍其高温性能最好, 其高温容?量保持率可以达到92%.

关键词: 球形氢氧化镍, 高温性能, 表面包覆, 氢氧化镱

Abstract: The poor high-temperature performance of the spherical nickel hydroxide becomes the main reason for limitation of use as the positive electrode active material in MH-Ni
battery, especially for the vehicle power. In the present work, different amount of ytterbium hydroxide layers were coated on the surface of the
spherical nickel hydroxide by means of the controlled crystallization. The charge and discharge capacities were studied at room and high temperatures.
The discharge capacity of the ytterbium-coated nickel hydroxide at room temperature was lower than that of the pure nickel hydroxide; however, its
high-temperature performance was much higher than that of the pure spherical nickel hydroxide. The sample coated with 2% ytterbium
hydroxide shows the best performance at 60℃ (1C), its capacity retention can be retained about 92%.

Key words: spherical nickel hydroxide, high-temperature performance, surface coating, ytterbium hydroxide

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