锌银电池长湿荷电搁置开路电压下降的机理  

Mechanism of open-circuit voltage drop of zinc-silver battery during long wet charging storage

作　　者：覃韬 李萌 罗晓玉 QIN Tao;LI Meng;LUO Xiao-yu(State Key Laboratory of Advanced Chemical Power Sources,Guizhou Meiling Power Sources Co.,Ltd.,Zunyi,Guizhou 563003,China)

机构地区：[1]贵州梅岭电源有限公司,特种化学电源国家重点实验室,贵州遵义563003

出　　处：《电池》2023年第4期428-431,共4页Battery Bimonthly

摘　　要：针对不同放电容量的锌银电池单体在长湿荷电搁置后外形及开路电压的变化,开展负极析H_(2)、正极耗H_(2)实验,验证H_(2)对正极电极电位的影响。通过气相色谱分析、实验复现等方法,探索高放电容量单体电池在长湿荷电搁置过程中开路电压下降并维持在约0.4 V的机理。锌电极溶解析出的H_(2)会与正极发生还原反应,且H_(2)会吸附在正极表面,二者共同作用使正极电极电位下降,导致单体电池开路电压下降。In view of the shape and open-circuit voltage changes of zinc-silver single cell with different discharge capacity after long wet charging storage,the anode H_(2) evolution and cathode H_(2) consumption experiments were carried out,the effect of H_(2) on the cathode potential was verified.The mechanism of open-circuit voltage dropping and maintaining at about 0.4 V during long wet charging storage was explored by gas chromatography analysis and experiment replication.The hydrogen dissolved from zinc electrode would have a reduction reaction with the cathode,the hydrogen would be adsorbed on the surface of the cathode.The combined action of the two would reduce the potential of the cathode,resulting in the decrease of the open-circuit voltage of the single cell.

关 键 词：高放电容量 长湿荷电搁置 电极电位 

分 类 号：TM912.9[电气工程—电力电子与电力传动]