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Preparation and Electrochemical Performance of V2O3-C Dual-Layer Coated LiFePO4 by Carbothermic Reduction of V2O5
You-liang Wei,Hong-fa Xiang*
Author NameAffiliationE-mail
You-liang Wei School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China  
Hong-fa Xiang* School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China hfxiang@hfut.edu.cn 
Abstract:
The V2O3-C dual-layer coated LiFePO4 cathode materials with excellent rate capability and cycling stability were prepared by carbothermic reduction of V2O5. X-ray powder diffraction, elemental analyzer, high resolution transmission electron microscopy and Raman spectra revealed that the V2O3 phase co-existed with carbon in the coating layer of LiFePO4 particles and the carbon content reduced without graphitization degree changing after the carbothermic reduction of V2O5. The electrochemical measurement results indicated that small amounts of V2O3 improved rate capability and cycling stability at elevated temperature of LiFePO4/C cathode materials. The V2O3-C dual-layer coated LiFePO4 composite with 1wt% vanadium oxide delivered an initial specific capacity of 167 mAh/g at 0.2 C and 129 mAh/g at 5 C as well as excellent cycling stability. Even at elevated temperature of 55 oC, the specific capacity of 151 mAh/g was achieved at 1 C without capacity fading after 100 cycles.
Key words:  Lithium iron phosphate, Vanadium oxide, Carbon coating, Li-ion battery
FundProject:
碳热还原法制备V2O3-C双层包覆磷酸铁锂及其电化学性能
卫友亮,项宏发*
摘要:
通过V2O5的碳热还原反应制备了具有优异倍率性能和循环稳定性的V2O3-C双层包覆的磷酸铁锂正极材料. 粉末X射线衍射、元素分析、高分辨投射电镜和拉曼光谱研究表明V2O3相与碳层共包覆于磷酸铁锂颗粒表面. 在V2O5的碳热还原反应后,碳含量明显降低,但石墨化程度未发生明显改变. 电化学测试结果表明少量V2O3显著改善了磷酸铁锂正极材料的倍率性能和高温循环性能,包含1%氧化钒的复合正极材料在0.2 C放电容量为167 mAh/g,5 C时放电容量为129 mAh/g,并且循环稳定性优异;在55 oC和1 C时放电容量为151 mAh/g,循环100次后无明显容量衰减.
关键词:  磷酸铁锂,氧化钒,碳包覆,锂离子电池
DOI:10.1063/1674-0068/28/cjcp1502025
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