降级(电信)
材料科学
石墨
环境科学
复合材料
工程类
电气工程
作者
Xianying Zhang,Qiyu Wang,Yu Li,Xiaolei Chen,Ling Tang,Xiqian Yu,Hong Li
摘要
The reasons for abrupt capacity fading in commercial LiNi0.8Co0.1Mn0.1O2 (NCM811)/SiOx-graphite pouches have been analyzed using electrochemical methods. These methods include charge and discharge curves, differential curves and electrochemical impedance spectroscopy (EIS), and some advanced testing techniques comprising scanning electron microscope (SEM), x-ray photoelectron spectroscopy (XPS) and x-ray diffraction (XRD). The main reason for capacity attenuation through experimental verification after the battery is disassembled is that the silicon-based anode material deteriorates further, resulting in a significant number of cracks with the progression of cycles. In addition, electrolyte enters into the cracks, leading to the excessive growth of solid electrolyte interface (SEI) and the increase of impedance, which eventually causes the failure of conductive networks, the difficulty of ion transmission and the rise in polarization, ultimately bringing about lithium dendrites.
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