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Electrochemical Study of Monoclinic Li3V2(PO4)3 in the Voltage Range of 1.5~3.0 V
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Electrochemical Study of Monoclinic Li3V2(PO4)3 in the Voltage Range of 1.5~3.0 V
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National Natural Science Foundation of China (51142001) and Hunan Provincial Natural Science Foundation of China (12JJ2022)

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    摘要:

    采用液相法合成了Li3V2(PO4)3 (空间群P21/n)电活性材料。用XRD和恒流充放电对样品的微观结构和电化学性能进行了表征。结果表明,在1.5~4.3 V电压范围内,样品在平均电压为1.81和3.77 V时均发生了可逆的锂嵌入反应;锂嵌出和嵌入过程中均出现一系列复杂的相变。在1.5~3.0 V电压范围内,以C/5倍率循环50周后,样品的容量衰减极小,表明锂脱嵌反应具有优良的循环稳定性。因此,Li3V2(PO4)3可以同时作为正极和负极而组成对称电池。另外,1.5~4.3 V电压范围内进行的嵌锂反应可以充当一种内置的过充电安全阀

    Abstract:

    The electroactive lithium vanadium phosphate, monoclinic Li3V2(PO4)3 [space group 14(P21/n)] has been synthesized by a solution route. The microstructure and electrochemical properties of the samples were characterized through combination of X-ray diffraction and galvanostatical discharge/discharge. Preliminary electrochemical evaluation indicates that this phosphate undergoes reversible lithium insertion reactions at average potentials of 1.81 and 3.77 V, and a complex series of two-phase transitions were observed during lithium extraction and insertion in the voltage range of 1.5~4.3 V. Constant current cycling conducted at C/5 and in the voltage range of 1.5~3.0 V is indicative of the longer term stability of the lithium insertion reactions evidenced by minimal capacity fade over the first 50 charge-discharge cycles. Therefore Li3V2(PO4)3 maybe used as both cathode and anode for fabrication of a symmetric lithium-ion battery, and the lithium insertion in the voltage region of 1.5~3.0 V could serve as a built-in overdischarge safety valve

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唐安平,何则强,徐国荣,令玉林,彭荣华. Electrochemical Study of Monoclinic Li3V2(PO4)3 in the Voltage Range of 1.5~3.0 V[J].稀有金属材料与工程,2013,42(5):897~900.[Tang Anping, He Zeqiang, Xu Guorong, Ling Yulin, Peng Ronghua. Electrochemical Study of Monoclinic Li3V2(PO4)3 in the Voltage Range of 1.5~3.0 V[J]. Rare Metal Materials and Engineering,2013,42(5):897~900.]
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  • 收稿日期:2012-05-25
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