Electrochemical Corrosion Behavior of the Copper Current Collector in the Electrolyte of Lithium-ion Batteries
Electrochemical Corrosion Behavior of the Copper Current Collector in the Electrolyte of Lithium-ion Batteries
复制标题
铜集流体在锂离子电池电解液中的电化学腐蚀行为
DOI：
10.20964/2017.11.28
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发表时间：
2017-11-01
影响因子：
1.5
通讯作者：
Zeng, Taofang
中科院分区：
文献类型：
--
作者：
Dai, Shuowei;Chen, Jian;Zeng, Taofang
铜通常用作锂离子电池中的阳极集流体。它在有机电解液中的稳定性会影响锂离子电池的性能。本文通过电化学阻抗谱（EIS）和极化测量研究了锂离子电池电解液中铜集流体的腐蚀机理。通过扫描电子显微镜（SEM）和能谱分析（EDS）观察了铜的微观结构。电化学阻抗谱的拟合结果表明，在暴露于电解液的初始阶段，R - f和R - t增大，这表明形成了一层保护层。在电解液中暴露长达720小时后，可以在铜表面清晰地观察到蚀孔。
Copper is usually used as an anode current collector in lithium-ion batteries. Its stability in the organic electrolyte impacts the performance of the lithium-ion battery. In this paper, the corrosion mechanism of the copper current collector in the electrolyte of lithium-ion batteries was examined by electrochemical impedance spectroscopy(EIS) and polarization measurements. The microstructures of copper were observed by scanning electron microscopy(SEM) and energy dispersive spectroscopy (EDS). The fitted results of electrochemical impedance spectroscopy showed that Rf and Rt increased at the initial stage of exposure to the electrolyte indicating that a protective layer formed. After exposure to the electrolyte for up to 720 h, pitting holes could be clearly observed on the surface of copper.