物理化学学报 >> 2011, Vol. 27 >> Issue (11): 2600-2604.doi: 10.3866/PKU.WHXB20111126

电化学和新能源 上一篇    下一篇

LiV3O8在Li2SO4水溶液中的电化学性能

刘黎1,2, 田方华1, 王先友1,2, 周萌1   

  1. 1. 湘潭大学化学学院, 环境友好化学与应用教育部重点实验室, 湖南湘潭 411105;
    2. 湘潭大学, 材料设计及制备技术湖南省重点实验室, 湖南湘潭 411105
  • 收稿日期:2011-07-13 修回日期:2011-09-09 发布日期:2011-10-27
  • 通讯作者: 刘黎 E-mail:liuli@xtu.edu.cn
  • 基金资助:

    国家自然科学基金(20871101), 湖南省教育厅项目(10C1250), 湖南省自然科学基金(11JJ4038)及湖南省科技厅项目(2010RS4027)资助

Electrochemical Behavior of LiV3O8 in Aqueous Li2SO4 Solution

LIU Li1,2, TIAN Fang-Hua1, WANG Xian-You1,2, ZHOU Meng1   

  1. 1. Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, School of Chemistry, Xiangtan 411105, Hunan Province, P. R. China;
    2. Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Xiangtan 411105, Hunan Province, P. R. China
  • Received:2011-07-13 Revised:2011-09-09 Published:2011-10-27
  • Contact: LIU Li E-mail:liuli@xtu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20871101), Scientific Research Fund of Hunan Provincial Education Department, China (10C1250), Natural Science Foundation of Hunan Province, China (11JJ4038), and Scientific Research Fund of Hunan Provincial Science & Technology Department, China (2010RS4027).

摘要: 采用低温固相法合成了具有纳米结构的LiV3O8材料. 扫描电子显微镜(SEM)及透射电子显微镜(TEM)测试显示该材料具有纳米结构. X 射线衍射(XRD)表明该材料属于单斜晶系, P21/m空间群. 并采用循环伏安法(CV)及电化学阻抗谱图测试对该材料在1、2 mol·L-1 Li2SO4 水溶液及饱和Li2SO4 水溶液中的电化学行为进行了研究. 结果表明, LiV3O8 在饱和Li2SO4 水溶液中具有最好的电化学性能. 以LiV3O8 作为负极材料, LiNi1/3Co1/3Mn1/3O2作为正极材料, 饱和Li2SO4水溶液作为电解液组成了水性锂离子电池, 进行恒流充放电测试, 结果表明, 在0.5C (1C=300 mA·g-1)的充放电倍率下, 该水性锂离子电池的首次放电比容量为95.2 mAh·g-1, 循环100次后仍具有37.0 mAh·g-1的放电比容量.

关键词: 水性锂离子电池, 钒酸锂, 硫酸锂水溶液, 水性电解液, 电化学性能

Abstract: Nanostructured LiV3O8 powder was synthesized by a low-temperature solid-state method. Scanning election microscopy (SEM) and transmission electron microscopy (TEM) show that the as-prepared material is composed of nanostructured particles. X-ray diffraction (XRD) measurements indicate that the as-prepared material has a monoclinic structure with a space group of P21/m. The electrochemical properties of the LiV3O8 electrodes in 1 mol·L-1 Li2SO4, 2 mol·L-1 Li2SO4, and saturated Li2SO4 aqueous electrolytes were studied using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in this work. The results show that the LiV3O8 electrode in the saturated Li2SO4 electrolyte has the best electrochemical properties. An aqueous rechargeable lithium battery (ARLB) containing a LiV3O8 anode, a LiNi1/3Co1/3Mn1/3O2 cathode, and a saturated Li2SO4 electrolyte was fabricated. The battery delivered an initial capacity of 95.2 mAh·g-1 and retained a capacity of 37.0 mAh·g-1 after 100 cycles at a charge-discharge rate of 0.5C (1C=300 mA·g-1).

Key words: Aqueous rechargeable lithium battery, LiV3O8, Li2SO4 aqueous solution, Aqueous electrolyte, Electrochemical property

MSC2000: 

  • O646