化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (1) : 121-124.

科学研究

镁铝联合掺杂对Li₃V₂(PO₄)₃/C电化学性能的影响研究

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Influence of Mg²⁺and Al³⁺ united doping on the electrochemical performance of Li₃V₂(PO₄)₃/C

Zhang Tianrui¹, Luo Mingbiao^1,2, Huang Yanghui², Xv Zhiliang²

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Received
2016-09-21
Issue Date	Revised Date
2018-03-01	2016-09-21

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摘要

通过X射线衍射、扫描电镜、恒流充放电、循环伏安和阻抗(EIS)等技术对材料的形貌和电化学性能进行分析,研究了Mg、Al同时掺杂对溶胶-凝胶法合成单斜晶型Li₃V₂(P0₄)₃/C材料电化学性能的影响。结果表明:相对纯的磷酸钒锂/C(LVP/C),少量的掺杂没有影响材料的结构,电化学性能有显著提升,并且Li_2.9Mg_0.05V_1.9Al_0.1(PO₄)₃/C材料具有最好的电化学性能。在室温3～4.3V充放电平台下,以0.1C首次放电比容量达到130.7mAh/g,第50次循环的放电比容量仍有127.2mAh/g,容量保持率为97.3%。

Abstract

The effect of Al and Mg united doping on Li₃V₂(PO₄)₃/C anode material prepared by sol-gel method was discussed.By XRD,SEM,constant current charge discharge,CV and EIS,the microstructure,particle morphology and electrochemical performance of material were analyzed.The effect of Al and Mg united doping with different amount on the structure and electrochemical properties of material was studied.The results showed that compared LVP/C,the doping amount can decrease the grain and improved the electrochemical performance.Li_2.9Mg_0.05V_1.9Al_0.1(PO₄)₃/C had the best electrochemical performance.Under the room temperature 3～4.3V charging and discharging platform with 0.1C,the initial specific discharge capacity reached 130.7mAh/g.The discharge specific capacity after 50 cycles was still 127.2mAh/g capacity.And retention rate can still 97.3%.

关键词

正极材料 / Li₃V₂(PO₄)₃/C / Mg²⁺、Al³⁺掺杂 / 电化学性能

Key words

anode material / Li₃V₂(PO₄)₃/C / Mg²⁺and Al³⁺ doping / electrochemical performance

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镁铝联合掺杂对Li₃V₂(PO₄)₃/C电化学性能的影响研究[J]. 化工新型材料, 2018, 46(1): 121-124 DOI:

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原文顺序 | 出版日期 | 本文引用

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