正极添加CNTs对MH/Ni电池高倍率性能的影响  

Effects of addition of carbon nanotubes in positive electrode on properties of MH/Ni batteries under high-rate discharge conditions

作　　者：吕骥[1] 涂江平[1] 张文魁[2] 张博[2] 吴建波[1] 

机构地区：[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

出　　处：《中国有色金属学报》2003年第6期1378-1382,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家高技术研究发展计划资助项目 (2 0 0 3AA3 0 2 42 0 ) ;国家重点基础研究发展规划资助项目 (G2 0 0 0 0 2 64 0 6)

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 14mΩ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 1.16 7V左右 ,5C放电中值电压在 1.10 8V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。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 14 mΩ. Under high-rate discharge conditions, the batteries reveal higher discharge voltage. The value of middle discharge voltage is about (1.167 V) at (3 C-rate) discharge, and is about 1.108 V at 5 C-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.

关 键 词：MH/NI电池 碳纳米管 正极 高倍率放电 放电性能 

分 类 号：TM912[电气工程—电力电子与电力传动]