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过充电时LiMn₂O₄/LiPF₆-（EC+DEC）界面性质

The properties of LiMn₂O₄ /LiPF₆-（EC+DEC） interface during overcharge

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【Author】 LU Dong-sheng~1, LI Wei-shan~1, LIU Xu~2, QIU Shi-zhou~2(1.Department of Chemistry, South China Normal University,Guangzhou, Guangdong 510631, China; 2.Guangzhou Battery Factory, Guangzhou, Guangdong 510253, China)

【机构】华南师范大学化学系；广州电池厂；广州电池厂广东广州　510631；广东广州　510631；广东广州　510253；广东广州　510253；

【摘要】用交流阻抗法结合循环伏安法研究了LiMn2O4粉末微电极过充电对LiMn2O4/LiPF6 (EC+DEC)溶液界面性质的影响。结果表明:电荷传递电阻Rct随过充电时间的增加而增加,而表面膜电阻Rf基本不随过充电时间变化。过充电条件下,尖晶石锂锰氧化物的结构受到破坏,电解质的氧化产物可能是气体和水。更多还原

【Abstract】 The influence of overcharge of LiMn₂O₄ powder electrode on the properties of LiMn₂O₄/LiPF₆-（EC+DEC） interface were investigated by impedance technique and cyclic voltammetry.Results showed that charge-transfer resistance R _ct increased with overcharge time, while surface film resistance R _f changed little during overcharge.Structure of LiMn₂O₄ was destroyed, gas and water could be produced during overcharge.更多还原