Synthesis and electrochemical performance of 0.6Li3V2(PO4)3·0.4Li–V–O composite cathode material for lithium ion batteries
Synthesis and electrochemical performance of 0.6Li3V2(PO4)3·0.4Li–V–O composite cathode material for lithium ion batteries
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DOI：
10.1016/j.electacta.2015.02.073
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发表时间：
2015-04
影响因子：
6.6
通讯作者：
Yahao Li;W. Bai;Dong-huang Wang;Xiao-qing Niu;Yi-Jun Zhang;Haichao Tang;X. Wang;C. Gu;J. Tu
中科院分区：
文献类型：
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作者：
Yahao Li;W. Bai;Dong-huang Wang;Xiao-qing Niu;Yi-Jun Zhang;Haichao Tang;X. Wang;C. Gu;J. Tu
采用溶胶-凝胶法、溶剂热法和固相法合成了一种新型的0. 6Li 3V 2（PO 4）3·0.4Li-V-O复合正极材料。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）和X射线光电子能谱（XPS）对复合材料的形貌和结构进行了表征。复合颗粒结晶良好，呈均匀的纳米片状。复合材料中除Li 3V 2（PO 4）3相外，还存在LiV 2 O 5和VO 2相。0.6Li3V2（PO 4）3·0.4Li-V-O电极在2.0 V至4.3 V之间在50 mAg− 1下的放电容量为149.3 mAh g− 1，并且具有比Li 3V 2（PO 4）3更高的倍率性能。用恒电流间歇滴定法（GITT）测得Li离子在复合材料中的扩散系数为10 - 9.5 - 10 - 7.5cm ~ 2·s ~（-1）。
A novel 0.6Li3V2(PO4)3·0.4Li–V–O composite cathode material is synthesized by sol-gel method followed by solvothermal and solid state reaction. The morphology and structure of the composite are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photo-electron spectroscopy (XPS). The composite particles are well-crystallized and present uniform nanoplate alike. Except Li3V2(PO4)3phase, LiV2O5and VO2are also present in the composite. The 0.6Li3V2(PO4)3·0.4Li–V–O electrode delivers a discharge capacity of 149.3 mAh g−1at 50 mAg−1between 2.0 V and 4.3 V, and has higher rate property than Li3V2(PO4)3. The diffusion coefficients of Li ions in the composite are in the range of 10−9.5− 10−7.5cm2s−1obtained from galvanostatic intermittent titration technique (GITT).