Characteristics of surface films formed at a mesocarbon microbead electrode in a Li-ion battery
Characteristics of surface films formed at a mesocarbon microbead electrode in a Li-ion battery
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DOI：
10.1016/s0378-7753(00)00465-1
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发表时间：
2000-12
影响因子：
9.2
通讯作者：
J. S. Kim;Yuwon Park
中科院分区：
文献类型：
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作者：
J. S. Kim;Yuwon Park
研究了市售中间相炭微球（MCMB）作为碳锂电极在电解液中的界面现象，电解液由1 M LiPF 6溶于碳酸乙烯酯（EC）和碳酸二乙酯（DEC）的等量混合物组成.一旦锂（Li）的充放电进行，在MCMB碳电极上形成表面膜，并且其厚度随着循环次数而增加。用扫描电子显微镜观察了表面膜的生长随循环次数的变化，用交流阻抗法测量了表面电阻。随着循环次数的增加，充电容量不断下降，这与薄膜的生长有关。表面敏感傅里叶变换红外光谱（FT-IR）表明，表面膜由溶剂化的锂化合物组成。
An investigation is made on the interfacial phenomena of commercially available mesocarbon microbeads (MCMB) as the carbon lithium electrode in an electrolyte, which consists of 1 M LiPF6dissolved in an equal mixture of ethylene carbonate (EC) and diethyl carbonate (DEC). Once the charge–discharge of lithium (Li) proceeds, a surface film is formed on the MCMB carbon electrode, and its thickness increases with cycle number. The growth of the surface film with cycle number is observed by a scanning electron microscope and the surface resistance by means of AC impedance measurements. A continuous decrease in the charge capacity with cycle number is found and is related to film growth. The surface films are composed of solvated Li compounds, as shown by surface-sensitive Fourier transform infrared (FT-IR) spectroscopy.