力曲线用于硅负极材料表面膜的研究

doi:10.13208/j.electrochem.130357

电化学（中英文） ›› 2013, Vol. 19 ›› Issue (6): 530-536. doi: 10.13208/j.electrochem.130357

• 锂离子电池近期研究专辑 (厦门大学杨勇教授主编) • 上一篇下一篇

力曲线用于硅负极材料表面膜的研究

郑杰允，郑浩，汪锐，李泓^*，陈立泉

中国科学院物理研究所，北京 100190

收稿日期:2013-05-27 修回日期:2013-07-15 出版日期:2013-12-28 发布日期:2013-12-23
通讯作者: 李泓 E-mail:hli@iphy.ac.cn
基金资助:
中科院知识创新工程重要方向项目（No. KJCX2-YW-W26）、国家重点基础研究发展计划（973）项目（No. 2012CB932900）资助.

An Investigation on the Solid Electrolyte Interphase of Silicon Anode for Li-Ion Batteries through Force Curve Method

ZHENG Jie-yun, ZHENG Hao, WANG Rui, LI Hong^*, CHEN Li-quan

Institute of Physics, Chinese Academy of Science, Beijing 100190, China

Received:2013-05-27 Revised:2013-07-15 Published:2013-12-28 Online:2013-12-23
Contact: LI Hong E-mail:hli@iphy.ac.cn

摘要/Abstract

摘要： 利用原子力显微镜（AFM）力曲线模式来研究锂离子电池硅负极材料在含碳酸亚乙烯酯添加剂（VC）电解质首周循环时固态电解质相表面膜（SEI膜）的三维结构. 测试表明SEI膜具有多层结构，同时得到SEI膜厚度、杨氏模量以及覆盖度在首周循环过程中的变化，采用三维图呈现了硅材料表面膜的分布.

关键词: 薄膜硅负极, 固态电解质相表面膜, 原子力显微镜, 力曲线, 锂离子电池

Abstract: Non-aqueous electrolyte has been widely used in commercial Li-ion batteries. Optimized choices are proceeding among the various types of salts and solvents in an effort to achieve higher performance of electrolyte. However, the electrolyte will be reduced in low potential and the reductive product will be deposited on the surface of anode to form a passivating layer, solid electrolyte interphase (SEI). Herein an atomic force microscopy (AFM) based method was introduced to study the structure and mechanical property of SEI on silicon thin film anode during the first cycle. Silicon has been known as the most potential candidate anode for next generation of Li-ion batteries. However, large volume change and unstable SEI formation during cycling are needed to be resolved before practical application. In this study, the electrolyte was 1 mol·L-1 LiPF6 (EC:DMC=1:1) containing 2% vinylene carbonate. Layered-structures such as single layer, double layers and triple layers of SEI were detected, and the Young’s Modulus of the SEI was extracted from the force curves. Coverage of SEI was also obtained. A 3-D plot was introduced to real space mapping the formation of SEI on silicon anode at different cycle states.

Key words: silicon anode, solid electrolyte interphase, atomic force microscopy, force curve, Li-ion batteries

中图分类号:

O646

郑杰允，郑浩，汪锐，李泓*，陈立泉. 力曲线用于硅负极材料表面膜的研究[J]. 电化学（中英文）, 2013, 19(6): 530-536.

ZHENG Jie-yun, ZHENG Hao, WANG Rui, LI Hong*, CHEN Li-quan. An Investigation on the Solid Electrolyte Interphase of Silicon Anode for Li-Ion Batteries through Force Curve Method[J]. Journal of Electrochemistry, 2013, 19(6): 530-536.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.130357

https://electrochem.xmu.edu.cn/CN/Y2013/V19/I6/530

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力曲线用于硅负极材料表面膜的研究

An Investigation on the Solid Electrolyte Interphase of Silicon Anode for Li-Ion Batteries through Force Curve Method

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