物理化学学报 >> 2006, Vol. 22 >> Issue (09): 1155-1158.doi: 10.3866/PKU.WHXB20060924

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双向脉冲充电法对锂枝晶生成的抑制

陈玲;李雪莉;赵强;蔡文斌;江志裕   

  1. 复旦大学化学系, 分子催化和创新材料上海重点实验室, 上海 200433
  • 收稿日期:2006-03-10 修回日期:2006-05-16 发布日期:2006-09-04
  • 通讯作者: 江志裕 E-mail:zyjiang@fudan.ac.cn

Bipolar Pulse Current Charge Method for Inhibiting the Formation of Lithium Dendrite

CHEN Ling;LI Xue-Li;ZHAO Qiang;CAI Wen-Bin;JIANG Zhi-Yu   

  1. Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, P. R. China
  • Received:2006-03-10 Revised:2006-05-16 Published:2006-09-04
  • Contact: JIANG Zhi-Yu E-mail:zyjiang@fudan.ac.cn

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摘要： 采用双向脉冲电流充电方法取代传统的直流电充电方法, 研究了金属锂电极在有机电解液1 mol•L−1 LiPF6/碳酸乙烯酯(EC):二甲基碳酸脂(DMC)(1:1, V/V)中的充电过程. 锂电极的表面变化通过原位显微镜观测和交流阻抗谱进行检测. 原位显微镜观测结果显示, 在直流充电时锂电极上明显地出现了枝晶, 而在双向脉冲充电时, 枝晶的产生和生长受到了抑制. 交流阻抗谱结果显示在双向脉冲充电下, 锂电极的表面积增长较直流充电时缓慢. 这种抑制枝晶生长, 稳定锂沉积的新充电方法有望用于锂阳极二次电池.

关键词: 锂二次电池, 锂电极, 枝晶, 电池充电, 双向脉冲电流

Abstract: A bipolar pulse current charge method was developed to charge lithium metal electrode in 1 mol•L−1 LiPF6/ethylene carbonate (EC):dimethyl carbonate (DMC) (1:1, V/V) electrolyte. The surface variations of lithium electrode during charge processes were investigated by in situ optical microscopic observation and impedance measurement. It was observed that lithium dendrites formed on lithium electrode during direct current (DC) charge process, but it was inhibited by bipolar pulse charge method. The results of the impedance measurement show that the surface area increases much slower in bipolar pulse current charge process than that in DC charge process. This technique may be useful for the rechargeable lithium battery.

Key words: Lithium secondary battery, Lithium electrode, Dendrite, Battery charge, Bipolar pulse current