中国物理B ›› 2021, Vol. 30 ›› Issue (6): 68202-068202.doi: 10.1088/1674-1056/abf558

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Silicon micropillar electrodes of lithiumion batteries used for characterizing electrolyte additives

Fangrong Hu(胡放荣)1, Mingyang Zhang(张铭扬)1,2, Wenbin Qi(起文斌)2,3, Jieyun Zheng(郑杰允)2, Yue Sun(孙悦)2, Jianyu Kang(康剑宇)2, Hailong Yu(俞海龙)2, Qiyu Wang(王其钰)2, Shijuan Chen(陈世娟)5, Xinhua Sun(孙新华)5,6, Baogang Quan(全保刚)2,3,4,†, Junjie Li(李俊杰)2,‡, Changzhi Gu(顾长志)2, and Hong Li(李泓)2,§   

  1. 1 Guangxi Key Laboratory of Automatic Detecting Technology and Instrument, Guilin University of Electronic Technology, Guilin 541004, China;
    2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    3 University of Chinese Academy of Sciences, Beijing 10049, China;
    4 Songshan Lake Materials Laboratory, Dongguan, China;
    5 Tianjin Jinniu Power Sources Material Co., Ltd, Tianjin 300400, China;
    6 Cenertech Tianjin Chemical Research and Design Institute Co., Ltd, Tianjin 300131, China
  • 收稿日期:2021-02-28 修回日期:2021-04-02 接受日期:2021-04-07 出版日期:2021-05-18 发布日期:2021-06-05
  • 通讯作者: Baogang Quan, Junjie Li, Hong Li E-mail:quanbaogang@aphy.iphy.ac.cn;lijunjie@iphy.ac.cn;lihong@iphy.ac.cn
  • 基金资助:
    Project supported by the National Key R&D Program of China (Grant Nos. 2016YFB0100500 and 2016YFB0100100) and the National Natural Science Foundation of China (Grant Nos. 11674387, 11574385, 22005332, 115674368, and 62065005).

Silicon micropillar electrodes of lithiumion batteries used for characterizing electrolyte additives

Fangrong Hu(胡放荣)1, Mingyang Zhang(张铭扬)1,2, Wenbin Qi(起文斌)2,3, Jieyun Zheng(郑杰允)2, Yue Sun(孙悦)2, Jianyu Kang(康剑宇)2, Hailong Yu(俞海龙)2, Qiyu Wang(王其钰)2, Shijuan Chen(陈世娟)5, Xinhua Sun(孙新华)5,6, Baogang Quan(全保刚)2,3,4,†, Junjie Li(李俊杰)2,‡, Changzhi Gu(顾长志)2, and Hong Li(李泓)2,§   

  1. 1 Guangxi Key Laboratory of Automatic Detecting Technology and Instrument, Guilin University of Electronic Technology, Guilin 541004, China;
    2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    3 University of Chinese Academy of Sciences, Beijing 10049, China;
    4 Songshan Lake Materials Laboratory, Dongguan, China;
    5 Tianjin Jinniu Power Sources Material Co., Ltd, Tianjin 300400, China;
    6 Cenertech Tianjin Chemical Research and Design Institute Co., Ltd, Tianjin 300131, China
  • Received:2021-02-28 Revised:2021-04-02 Accepted:2021-04-07 Online:2021-05-18 Published:2021-06-05
  • Contact: Baogang Quan, Junjie Li, Hong Li E-mail:quanbaogang@aphy.iphy.ac.cn;lijunjie@iphy.ac.cn;lihong@iphy.ac.cn
  • Supported by:
    Project supported by the National Key R&D Program of China (Grant Nos. 2016YFB0100500 and 2016YFB0100100) and the National Natural Science Foundation of China (Grant Nos. 11674387, 11574385, 22005332, 115674368, and 62065005).

摘要: The <100> crystal-oriented silicon micropillar array platforms were prepared by microfabrication processes for the purpose of electrolyte additive identification. The silicon micropillar array platform was used for the study of fluorinated vinyl carbonate (FEC), vinyl ethylene carbonate (VEC), ethylene sulfite (ES), and vinyl carbonate (VC) electrolyte additives in the LiPF6 dissolved in a mixture of ethylene carbonate and diethyl carbonate electrolyte system using charge/discharge cycles, electrochemical impedance spectroscopy, cyclic voltammetry, scanning electron microscopy, and x-ray photoelectron spectroscopy. The results show that the silicon pillar morphology displays cross-shaped expansion after lithiation/delithiation, the inorganic lithium salt keeps the silicon pillar morphology intact, and the organic lithium salt content promotes a rougher silicon pillar surface. The presence of poly-(VC) components on the surface of FEC and VC electrodes allows the silicon pillar to accommodate greater volume expansion while remaining intact. This work provides a standard, fast, and effective test method for the performance analysis of electrolyte additives and provides guidance for the development of new electrolyte additives.

关键词: lithium-ion batteries, solid electrolyte interphases, electrolyte additives, silicon micropillar electrodes

Abstract: The <100> crystal-oriented silicon micropillar array platforms were prepared by microfabrication processes for the purpose of electrolyte additive identification. The silicon micropillar array platform was used for the study of fluorinated vinyl carbonate (FEC), vinyl ethylene carbonate (VEC), ethylene sulfite (ES), and vinyl carbonate (VC) electrolyte additives in the LiPF6 dissolved in a mixture of ethylene carbonate and diethyl carbonate electrolyte system using charge/discharge cycles, electrochemical impedance spectroscopy, cyclic voltammetry, scanning electron microscopy, and x-ray photoelectron spectroscopy. The results show that the silicon pillar morphology displays cross-shaped expansion after lithiation/delithiation, the inorganic lithium salt keeps the silicon pillar morphology intact, and the organic lithium salt content promotes a rougher silicon pillar surface. The presence of poly-(VC) components on the surface of FEC and VC electrodes allows the silicon pillar to accommodate greater volume expansion while remaining intact. This work provides a standard, fast, and effective test method for the performance analysis of electrolyte additives and provides guidance for the development of new electrolyte additives.

Key words: lithium-ion batteries, solid electrolyte interphases, electrolyte additives, silicon micropillar electrodes

中图分类号:  (Nanostructured materials in electrochemistry)

  • 82.45.Yz
82.45.Fk (Electrodes) 82.47.Aa (Lithium-ion batteries)