物理化学学报 >> 2008, Vol. 24 >> Issue (04): 665-669.doi: 10.3866/PKU.WHXB20080420

研究论文 上一篇    下一篇

铝电极在LiNO3-KNO3熔盐中的电化学行为

屠晓华; 褚有群; 马淳安; 莫一平; 陈赵扬   

  1. 浙江工业大学应用化学系, 绿色化学合成技术国家重点实验室培育基地, 杭州 310032; 杭州生源医疗保健技术开发有限公司, 杭州 310012
  • 收稿日期:2007-10-15 修回日期:2007-12-17 发布日期:2008-04-07
  • 通讯作者: 马淳安 E-mail:science@zjut.edu.cn

Electrochemical Behavior of Aluminium Electrode in LiNO3-KNO3 Molten Salt

TU Xiao-Hua; CHU You-Qun; MA Chun-An; MO Yi-Ping; CHEN Zhao-Yang   

  1. State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou 310032, P. R. China; Hangzhou Shengyuan Medical and Health-Keeping Technology Developing Co., Ltd., Hangzhou 310012, P. R. China
  • Received:2007-10-15 Revised:2007-12-17 Published:2008-04-07
  • Contact: MA Chun-An E-mail:science@zjut.edu.cn

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摘要： 采用循环伏安和恒电位电解法考察了铝电极在LiNO3-KNO3熔盐中的电化学行为. 实验结果表明, 在该熔盐中, 锂离子在铝电极上的电还原过程伴随着新生态的锂原子向电极内部的随后扩散步骤; 锂原子进入铝电极后与铝发生合金化, 形成β-LiAl合金和γ-LiAl合金; 锂离子在铝电极上的还原过程受还原态锂在铝基体内的扩散步骤控制. 循环伏安实验发现, 铝电极在该熔盐中的氧化和还原峰电流都先随循环次数增加而增大, 最后基本上趋于稳定. 这表明铝电极在该熔盐体系中具有较好的电化学稳定性.

关键词: 铝电极, LiNO3-KNO3熔盐, 循环伏安, 电化学行为

Abstract: The electrochemical behavior of aluminium in LiNO3-KNO3 molten salt electrolyte was studied by means of cyclic voltammetry and potentiostatic electrolysis. It was shown that the electrochemical reduction of Li+ at the aluminium electrode was followed by the diffusion of the nascent Li atom formed at the electrode surface into aluminiummatrix; and the β-phase and γ-phase Li-Al alloys were formed by alloying of Li atomwith Al; the electrode process was controlled by the diffusion of Li atom into Al matrix. The cyclic voltammetric experiments showed that both reductive peak current and oxidative peak current increased firstly with the increase of cycles, and then reached to a constant value after certain cycles. This indicated that the aluminium electrode had good electrochemical stability in the LiNO3-KNO3 molten salt electrolyte.

Key words: Aluminiumelectrode, LiNO3-KNO3 molten salt, Cyclic voltammetry, Electrochemical behavior