| Li3V2(PO4)3/C和Li2.5Na0.5V2(PO4)3/C的结构和电化学性能的比较研究 |
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| 引用本文： | 王文辉,陈振宇,戴长松,纪大龙,李佳杰,魏 杰. Li3V2(PO4)3/C和Li2.5Na0.5V2(PO4)3/C的结构和电化学性能的比较研究[J]. 无机化学学报, 2012, 28(5): 1070-1074 |
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| 作者姓名： | 王文辉 陈振宇 戴长松 纪大龙 李佳杰 魏 杰 |
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| 作者单位： | 1. 哈尔滨工业大学化工学院,哈尔滨,150001
2. 苏州科技学院,苏州,215009 |
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| 基金项目： | 国家自然科学基金，黑龙江省博士后启动基金资助项目 |
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| 摘 要： | 采用溶胶-凝胶法合成了锂离子正极材料Li3V2(PO4)3/C(LVP/C)及Li2.5Na0.5V2(PO4)3/C,并用XRD、循环伏安及交流阻抗等方法,研究了大量Na+掺杂对材料结构和电化学性能影响。结果表明,大量钠离子的掺杂会使LVP结构由单斜向菱方转变。掺杂化合物Li2.5Na0.5V2(PO4)3/C在0.5 C充电1 C放电时,首次放电容量为118 mAh.g-1,50次循环后容量保持率为92.4%,并发现与单斜LVP存在多个放电平台不同,Li2.5Na0.5V2(PO4)3/C仅在3.7 V处有一个放电平台。
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| 关 键 词： | 锂离子电池 正极材料 磷酸钒锂 溶胶凝胶法 钠掺杂 晶体结构 |
A Comparative Structural and Electrochemical Study of Monoclinic Li3V2(PO4)3/C and Rhombohedral Li2.5Na0.5V2(PO4)3/C |
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| WANG Wen-Hui,CHEN Zhen-Yu,DAI Chang-Song,JI Da-Long,LI Jia-Jie and WEI Jie. A Comparative Structural and Electrochemical Study of Monoclinic Li3V2(PO4)3/C and Rhombohedral Li2.5Na0.5V2(PO4)3/C[J]. Chinese Journal of Inorganic Chemistry, 2012, 28(5): 1070-1074 |
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| Authors: | WANG Wen-Hui CHEN Zhen-Yu DAI Chang-Song JI Da-Long LI Jia-Jie WEI Jie |
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| Affiliation: | School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China,School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China,School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China,School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China,School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China and Suzhou University of Science and Technology, Suzhou, Jiangsu 215009, China |
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| Abstract: | A lithium-ion battery cathode material, Li2.5Na0.5V2(PO4)3/C, was prepared by the sol-gel method and characterized by X-ray diffraction (XRD), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). As a control, Li3V2(PO4)3/C(LVP/C) was also prepared and studied. The effect of sodium-ion doping on the structure and electrochemical properties was studied. The XRD pattern of Li2.5Na0.5V2(PO4)3/C indicates that the monoclinic structure of Li3-xNaxV2(PO4)3 has transformed into a rhombohedral structure because of large amount of sodium-ion doping. For Li2.5Na0.5V2(PO4)3/C, a specific discharge capacity of 118 mAh·g-1 is achieved at a 0.5 C charge rate and 1 C discharge rate, and a 92.4% retention rate of the initial capacity is obtained after 50 cycles. Different from monoclinic LVP, there is only one discharge plateau at 3.7 V in the charge/discharge voltage profile of Li2.5Na0.5V2(PO4)3/C. |
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| Keywords: | lithium-ion battery cathode material lithium vanadium phosphate sol-gel preparation Na-doping crystal structure |
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