纳米CoO的制备及对MH-Ni电池正极性能的影响  

Synthesis of nanoscaled CoO and its effects on the performance of positive electrodes for Ni-MH batteries

作　　者：吴建波[1] 

机构地区：[1]台州学院物理与电子工程学院物理与材料工程系,浙江台州318000

出　　处：《电源技术》2008年第9期617-619,共3页Chinese Journal of Power Sources

摘　　要：CoO添加剂可以有效地提高MH-Ni电池正极活性材料Ni(OH)2的放电深度,改善正极的综合放电性能。采用真空分解棒状超微CoCO3前驱体制备了粒度均匀的短棒状CoO纳米颗粒,并研究了纳米CoO对氢镍电池正极性能的影响。研究发现,纳米CoO代替普通亚微米CoO,可以使电极内部的CoOOH导电网络更均匀、更完整,并抑制g-NiOOH的生成,从而缩短电池制备的静置时间,提高正极的放电比容量和放电中值电压,并缓解电池放电比容量和放电中值电压的退化速度。COCO3 nanorods as precursor were synthesized by precipitation method and short rod-like nanoscaled CoO was prepared by decomposing COCO3 in vacuum. The results indicate that, compare with the electrodes with usual sub-micron CoO, CoOOH conductive network of the nanoscaled CoO has higher integrity and uniformity. Thus the formation of the γ-NiOOH is restrained to a low level and the electrodes with nanoscaled CoO exhibit higher specific capacity and higher mean discharge voltage.

关 键 词：MH-NI电池 正极添加剂 纳米CoO 放电比容量 

分 类 号：TM912.2[电气工程—电力电子与电力传动]