材料科学
阴极
涂层
电池(电)
电解质
热失控
介电谱
锂离子电池
电化学
电极
化学工程
复合材料
电气工程
化学
工程类
物理化学
功率(物理)
物理
量子力学
作者
Yan Li,Xiang Liu,Dongsheng Ren,Hungjen Hsu,Gui‐Liang Xu,Junxian Hou,Li Wang,Xuning Feng,Languang Lu,Wenqian Xu,Yang Ren,Ruihe Li,Xiangming He,Khalil Amine,Minggao Ouyang
出处
期刊:Nano Energy
[Elsevier]
日期:2020-05-01
卷期号:71: 104643-104643
被引量:85
标识
DOI:10.1016/j.nanoen.2020.104643
摘要
Nickel-rich layered lithium transition metal oxides, LiNixCoyMn1-x-yO2, are key cathode materials for high-energy lithium-ion batteries owing to their high specific capacity. However, the commercial deployment of nickel-rich oxides has been hampered by their poor thermostability and insufficient cycle life. Here full batteries with uncoated and TiO2-coated LiNi0.5Co0.2Mn0.3O2 cathodes and graphite anodes are compared in terms of electrochemical performance and safety behavior. The battery using a TiO2-coated LiNi0.5Co0.2Mn0.3O2 cathode exhibited better cyclic performance at high cutoff voltage. Electrochemical impedance spectroscopy analysis indicated that the TiO2-coated LiNi0.5Co0.2Mn0.3O2 cathode gave the battery a more stable charge transfer resistance. Transmission electron microscopy demonstrated that TiO2 coating reduced accumulation of the cathode electrolyte interface layer on the particle surface. Time-of-flight secondary ion mass spectrometry demonstrated that TiO2 coating markedly enhanced the interface stability of the cathode particle and protected the particle from serious etching by the electrolyte. Accelerating rate calorimetry revealed that the trigger temperature of thermal runaway for the battery using TiO2-coated LiNi0.5Co0.2Mn0.3O2 as cathode material was 257 °C, which was higher than that of the battery with the uncoated LiNi0.5Co0.2Mn0.3O2 cathode (251 °C). In situ X-ray diffraction during heating demonstrated that this enhanced safety can be attributed to the suppressed phase evolution of the coated cathode material.
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