锂-二氧化锰电池的正极导电剂  

Cathode conducting additives of lithium manganese dioxide cell

作　　者：张晶[1] 黄成德[1] 张世杰[2] 

机构地区：[1]天津大学化工学院,天津300072 [2]中国电子科技集团公司第十八研究所,天津300381

出　　处：《电源技术》2008年第9期596-598,623,共4页Chinese Journal of Power Sources

摘　　要：在锂-二氧化锰电池中,选择五种导电剂材料进行粉末电阻率的测试,结果表明乙炔黑和炭黑(SP)的电阻率相近,在所选择的材料中较大;KS15和膨胀石墨的电阻率相近,在320μΩ·m左右;而气相生长碳纤维(VGCF)是所有材料中电阻率最小的,仅为0.6μΩ·m。以乙炔黑为主导电剂,采用石墨类导电剂(KS15)与之混合的放电容量大。以气相生长碳纤维和SP混合作为导电剂的电极,在0.2mA/cm2条件下的放电性能略高于采用乙炔黑+膨胀石墨作为混合导电剂的电极,其中放电电压平台高60mV左右,放电时间增加了9.12h。而在5mA/cm2条件下放电性能则明显提高,放电电压平台比采用乙炔黑+膨胀石墨作为混合导电剂的电极提高了100mV左右,而且放电时间延长约52%。In lithium manganese dioxide cell, five kinds of conducting additives were compared on powder electrical conductivity. The results show that electrical conductivity of acetylene black is close to that of SP; the electrical conductivity of KS15 is around 320 μΩ·m similar to that of expanded graphite; VGCF exhibites the minimal electrical conductivity （0.6 μΩ·m） among the five materials. The cells with mixed conducting additive of acetylene black and graphite （expanded graphite, KS） show the maximal discharge capacity. The discharge properties of the electrodes with mixed conducting additive of carbon fiber （VGCF） and carbon black SP are better than that with acetylene black and expanded graphite at 0.2 mA/cm^2. The former one has a voltage plateau about 60 mV higher than the latter one, and its discharge time increases by 9.12 h. When discharge at 5 mA/cm^2, the discharge capacity properties of the former one are improved obviously： the discharge voltage plateau increases about 100 mV than the latter one; the discharge time is prolonged by 52%.

关 键 词：锂-二氧化锰电池 导电剂 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]