1.5～3.0V电压范围内单斜Li3V2(PO4)3的电化学研究

稀有金属材料与工程, 2013, 42(5): 899-902.

1.5～3.0V电压范围内单斜Li3V2(PO4)3的电化学研究

唐安平 ^1, , 何则强 ^2, , 徐国荣 ^3, , 令玉林 ^4, , 彭荣华 ^5,

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

3.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

4.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

5.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

基金项目: National Natural Science Foundation of China(51142001) Hunan Provincial Natural Science Foundation of China(12JJ2022)

关键词： Li3V2(PO4)3 , 锂离子电池 , 1.5～4.3 V电压范围

Electrochemical Study of Monoclinic Li3V2(Po4)3 in the Voltage Range of 1.5～3.0 V

Tang Anping ^1, , He Zeqiang ^2, , Xu Guorong ^3, , Ling Yulin ^4, , Peng Ronghua ^5,

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

3.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

4.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

5.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

Keywords： Li3V2(PO4)3 , lithium ion batteries , voltage range of 1.5～3.0 V

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,1.5～4.3 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.

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