Role of V2O5 coating on LiNiO2-based materials for lithium ion battery
Role of V2O5 coating on LiNiO2-based materials for lithium ion battery
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DOI：
10.1016/j.jpowsour.2013.06.133
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发表时间：
2014
影响因子：
9.2
通讯作者：
Xunhui Xiong;Zhixing Wang;Guochun Yan;Huajun Guo;Xinhai Li
中科院分区：
文献类型：
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作者：
Xunhui Xiong;Zhixing Wang;Guochun Yan;Huajun Guo;Xinhai Li
利用X射线衍射（XRD）、透射电子显微镜（TEM）、能谱仪（EDX）和X射线光电子能谱（XPS）等测试手段，证明V2 O 5成功包覆在LiNiO 2基材料上。V2 O 5层会与表面的Li杂质发生反应，降低LiNiO 2基材料的pH值和快速吸湿能力。电池测试表明，V2 O 5涂层作为HF抑制剂和/或HF清除剂，这有助于显着改善循环性能和在电解质中的存储特性。同时，V2 O 5在阴极材料与电解液接触时，特别是在高电压循环时，起到了隔离层的作用。结构分析表明，V2 O 5包覆层在延缓Ni 3 +/Ni 2+相变和锂从体相表面析出方面比其他氧化物包覆层具有更大的优势，这得益于V2 O 5与LiOH/Li 2CO 3表面杂质反应的性质。
X-ray diffraction (XRD), transmission electron microscope (TEM), energy dispersive spectrometer (EDX) and X-ray photoelectron spectroscopy (XPS) are used to demonstrate that V2O5is successfully coated on LiNiO2-based materials. The V2O5layer will react with Li impurities on surface, which will reduce the pH value and rapid moisture uptake ability of LiNiO2-based materials. Cells tests indicate that V2O5-coating layer works as HF inhibitor and/or HF scavenger, which contributes a significant improvement in cycling performance and storage characteristics in electrolyte. In the mean time, V2O5acts as isolating layer when cathode material contacts with electrolyte especially cycling at high voltage. Structural analysis shows that V2O5-coating layer has more advantage over other oxide coating in delaying Ni3+/Ni2+transformation and lithium extraction from bulk surface, which benefits from the properties of V2O5reacting with LiOH/Li2CO3impurities on surface.