(1. 浙江大學 材料科學與工程系，杭州 310027；
2. 浙江工業(yè)大學 應(yīng)用化學系， 杭州 310032)
摘 要: 對正極中添加多壁碳納米管（CNTs）的MH/ Ni電池的高倍率放電性能進行了研究。 結(jié)果表明： 正極中添加少量CNTs的Ni/MH電池具有優(yōu)異的高倍率放電性能。 利用正極中添加少量CNTs制成的標準AA型電池的內(nèi)阻在14 mΩ左右； 在高倍率放電條件下電池有更高的放電平臺， 3C放電中值電壓在1.167V左右， 5C放電中值電壓在1.108V左右； 電池循環(huán)容量保持率也高于正極中不加CNTs的電池。 隨著循環(huán)次數(shù)的增加， 正極中添加少量CNTs的電池內(nèi)阻升高幅度較小。
關(guān)鍵字: MH/Ni電池； 碳納米管； 正極； 高倍率放電
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
