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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 (空間群P21/n)電活性材料。用XRD和恒流充放電對樣品的微觀結(jié)構(gòu)和電化學(xué)性能進(jìn)行了表征。結(jié)果表明，在1.5~4.3 V電壓范圍內(nèi)，樣品在平均電壓為1.81和3.77 V時均發(fā)生了可逆的鋰嵌入反應(yīng)；鋰嵌出和嵌入過程中均出現(xiàn)一系列復(fù)雜的相變。在1.5~3.0 V電壓范圍內(nèi)，以C/5倍率循環(huán)50周后，樣品的容量衰減極小，表明鋰脫嵌反應(yīng)具有優(yōu)良的循環(huán)穩(wěn)定性。因此，Li3V2(PO4)3可以同時作為正極和負(fù)極而組成對稱電池。另外，1.5~4.3 V電壓范圍內(nèi)進(jìn)行的嵌鋰反應(yīng)可以充當(dāng)一種內(nèi)置的過充電安全閥

    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,何則強(qiáng),徐國榮,令玉林,彭榮華. Electrochemical Study of Monoclinic Li3V2(PO4)3 in the Voltage Range of 1.5~3.0 V[J].稀有金屬材料與工程,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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