1.5～3.0V电压范围内单斜Li_3V_2(PO_4)_3的电化学研究(英文)  

Electrochemical Study of Monoclinic Li_3V_2(PO_4)_3 in the Voltage Range of 1.5～3.0V

作　　者：唐安平[1] 何则强[2] 徐国荣[1] 令玉林[1] 彭荣华[1] 

机构地区：[1]湖南科技大学理论化学与分子模拟省部共建教育部重点实验室,湖南湘潭411201 [2]吉首大学,湖南吉首416000

出　　处：《稀有金属材料与工程》2013年第5期897-900,共4页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51142001);Hunan Provincial Natural Science Foundation of China(12JJ2022)

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1.5~4.3V电压范围内,样品在平均电压为1.81和3.77V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1.5~3.0V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,1.5~4.3V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。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 1.5～4.3V. Constant current cycling conducted at C/5 and in the voltage range of 1.5～3.0V 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 1.5～3.0V could serve as a built-in overdischarge safety valve.

关 键 词：LI3V2(PO4)3 锂离子电池 1 5~4 3V电压范围 

分 类 号：TM912[电气工程—电力电子与电力传动]