(1. 浙江大学 材料科学与工程系，杭州 310027；
2. 浙江工业大学 应用化学系， 杭州 310032)
摘 要: 对正极中添加多壁碳纳米管（CNTs）的MH/ Ni电池的高倍率放电性能进行了研究。 结果表明： 正极中添加少量CNTs的Ni/MH电池具有优异的高倍率放电性能。 利用正极中添加少量CNTs制成的标准AA型电池的内阻在14 mΩ左右； 在高倍率放电条件下电池有更高的放电平台， 3C放电中值电压在1.167V左右， 5C放电中值电压在1.108V左右； 电池循环容量保持率也高于正极中不加CNTs的电池。 随着循环次数的增加， 正极中添加少量CNTs的电池内阻升高幅度较小。
关键字: MH/Ni电池； 碳纳米管； 正极； 高倍率放电
properties of MH/Ni batteries under high-rate discharge conditions
（1. Department of Materials Science and Engineering,
Zhejiang University, Hangzhou 310027, China;
2. Department of Applied Chemistry,
Zhejiang University of Technology, Hangzhou 310032, China）
Abstract:Multi-walled carbon nanotubes (CNTs) were added into the positive electrodes of sealed MH/Ni rechargeable batteries. The results show that the addition of CNTs in the positive electrode modifies the batteries performance under high-rate discharge conditions. The internal resistance of the AA-type batteries fabricated in this way is about 14mΩ. Under high-rate discharge conditions, the batteries reveal higher discharge voltage. The value of middle discharge voltage is about 1.167V at 3C-rate discharge, and is about 1.108V at 5C-rate discharge. During the cycling tests under high-rate discharge conditions, the batteries with CNTs added in the positive electrodes present much better cycling stability than the batteries without CNTs in the positive electrodes. The increase in internal resistance of the batteries with CNTs is lower than that of the batteries without CNTs during charge/discharge cycles.
Key words: MH/Ni batteries; carbon nanotubes; positive electrode; high-rate discharge
