Investigation of the Surface State of LiCoO2Thin-Film Electrodes Using a Redox Reaction of Ferrocene
Investigation of the Surface State of LiCoO2Thin-Film Electrodes Using a Redox Reaction of Ferrocene
复制标题
DOI：
10.1149/2.0321704jes
复制
发表时间：
2017
影响因子：
3.9
通讯作者：
Junichi Inamoto;T. Fukutsuka;K. Miyazaki;T. Abe
中科院分区：
文献类型：
--
作者：
Junichi Inamoto;T. Fukutsuka;K. Miyazaki;T. Abe
锂离子电池性能劣化的原因之一是正极材料的劣化。在本研究中，LiCoO 2 的降解机理主要针对LiCoO 2 的表面电子电导率进行了研究。利用二茂铁的氧化还原反应研究了LiCoO 2 薄膜电极中表面电子电导率的变化。充放电循环后，LiCoO 2 薄膜电极的表面电子电导率增加，这表明未形成电子绝缘表面膜，并且在第1次循环时在表面区域快速形成锂离子缺陷相Li 1-x CoO 2 。研究发现，利用二茂铁的氧化还原反应可有效评估 LiCoO 2 的表面状态变化。
One of the reasons of performance deterioration of lithium-ion batteries is the degradation of positive electrode materials. In this study, the degradation mechanism of LiCoO 2 was investigated focusing on the surface electron conductivity of LiCoO 2. The surface electron conductivity change in LiCoO 2 thin-film electrode was investigated using a redox reaction of ferrocene. After charge-discharge cycles, the surface electron conductivity of the LiCoO 2 thin-film electrode was increased and this indicates that the electron insulating surface film was not formed and lithium-ion deficit phase Li 1-x CoO 2 was rapidly formed at the surface region at the 1st cycle. It is found that the use of the redox reaction of ferrocene is useful to evaluate the surface state change in LiCoO 2.