Use of in Situ Electrochemical Atomic Force Microscopy (EC-AFM) to Monitor Cathode Surface Reaction in Organic Electrolyte
Use of in Situ Electrochemical Atomic Force Microscopy (EC-AFM) to Monitor Cathode Surface Reaction in Organic Electrolyte
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DOI：
10.1021/ie020519z
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发表时间：
2002-11
影响因子：
4.2
通讯作者：
R. Vidu;F. Quinlan;P. Stroeve
中科院分区：
文献类型：
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作者：
R. Vidu;F. Quinlan;P. Stroeve
基于LiMn2O4的锂离子可充电电池的循环性能与表面反应有关。本文报道了利用原位电化学原子力显微镜（EC-AFM）和横向力显微镜（LFM）对室温下LiPF6电解质中LiMn2O4阴极的结构和电化学研究。在恒电位条件下，原位监测了有机电解质中的表面动力学。在第一次充放电循环后，表面特征清晰可见。在4.3 V vs Li/Li+的二次充电过程中，观察到表面颗粒的溶解。利用高度分布函数定量分析了表面形貌。发现溶解速率（由颗粒体积随时间的变化计算）遵循时间的平方根。在3.8 V vs Li/Li+的二次放电过程中，材料表面形成了新的颗粒。然而，在3.8 V vs Li/L的极化过程中，表面形貌没有随时间的进一步变化。
Surface reactions are responsible for the cycling performance of Li-ion rechargeable batteries based on LiMn2O4. We report structural and electrochemical studies of the LiMn2O4 cathode at room temperature in LiPF6 electrolyte using in situ electrochemical atomic force microscopy (EC-AFM) and lateral force microscopy (LFM). Surface dynamics were monitored in situ in organic electrolyte under potentiostatic conditions. After the first charge/discharge cycle, surface features were clearly visible. During the second charging process at 4.3 V vs Li/Li+, dissolution of surface particles was observed. The surface topography was quantitatively analyzed by height distribution functions. The dissolution rate (calculated from the change of particle volume with time) was found to follow the square root of time. During the second discharge process at 3.8 V vs Li/Li+, new particles were formed on the surface. However, there were no further changes in the surface topography with time during polarization at 3.8 V vs Li/L...