能源化学(英文版)

能源化学(英文) ›› 2019, Vol. 28 ›› Issue (2): 122-128.DOI: 10.1016/j.jechem.2018.03.003

• Preface • 上一篇    下一篇

Thickness evolution of graphite-based cathodes in the dual ion batteries via in operando optical observation

Na Lia,c, Yaoda Xinb, Haosen Chena,c,d, Shuqiang Jiaoe, Hanqing Jiangg, Wei-Li Songa,c, Daining Fanga,c,f   

  1. a Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China;
    b Overseas Education College, Nanjing University of Technology, Nanjing 211800, Jiangsu, China;
    c Beijing Key Laboratory of Lightweight Multi-Functional Composite Materials and Structures, Beijing Institute of Technology, Beijing 100081, China;
    d Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Institute of Technology, Beijing 100081, China;
    e State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
    f State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, China;
    g School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, USA
  • 收稿日期:2018-02-23 修回日期:2018-03-07 出版日期:2019-02-15 发布日期:2019-02-15
  • 通讯作者: Haosen Chen, Wei-Li Song
  • 基金资助:

    Financial support from 973 Project (2015CB932500), the National Natural Science Foundation of China (11672341, 111572002, 51302011), Innovative Research Groups of the National Natural Science Foundation of China (11521202), National Materials Genome Project (2016YFB0700600) and Beijing Natural Science Foundation (16L00001, 2182065) is gratefully acknowledged.

Thickness evolution of graphite-based cathodes in the dual ion batteries via in operando optical observation

Na Lia,c, Yaoda Xinb, Haosen Chena,c,d, Shuqiang Jiaoe, Hanqing Jiangg, Wei-Li Songa,c, Daining Fanga,c,f   

  1. a Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China;
    b Overseas Education College, Nanjing University of Technology, Nanjing 211800, Jiangsu, China;
    c Beijing Key Laboratory of Lightweight Multi-Functional Composite Materials and Structures, Beijing Institute of Technology, Beijing 100081, China;
    d Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Institute of Technology, Beijing 100081, China;
    e State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
    f State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, China;
    g School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, USA
  • Received:2018-02-23 Revised:2018-03-07 Online:2019-02-15 Published:2019-02-15
  • Contact: Haosen Chen, Wei-Li Song
  • Supported by:

    Financial support from 973 Project (2015CB932500), the National Natural Science Foundation of China (11672341, 111572002, 51302011), Innovative Research Groups of the National Natural Science Foundation of China (11521202), National Materials Genome Project (2016YFB0700600) and Beijing Natural Science Foundation (16L00001, 2182065) is gratefully acknowledged.

摘要： Graphite has been currently considered as a promising cathode material in dual ion batteries (DIBs) due to its unique features of sp2 hybridized carbon and stacked two-dimensional layered structures. However, unexpected volume/thickness changes in the graphite cathodes, induced by the intercalation/deintercalation of anions with large molecular size have been known to be a critical problem in designing DIB cells. To understand the volume/thickness changes in the DIB electrodes, in operando optical observing apparatus has been employed to observe the cross-section view of a graphite-based cathode upon cycles in the present work. The observation suggests that the cathode initially presented a huge irreversible thickness change (60%), and such thickness variation was prone to reduce and remain <20% in the following cycles. The results from both in operando observation and electrochemical characterizations collectively indicate that the greater thickness variation at initial cycle should be attributed to both anion intercalation into graphite-based cathodes and irreversible decomposition of chemical components in the DIB system. The method here highlights a universal route for fundamentally understanding the electrodes of huge volume variation.

关键词: Dual ion batteries, In operando optical observation, Graphite, Cathode, Thickness evolution

Abstract: Graphite has been currently considered as a promising cathode material in dual ion batteries (DIBs) due to its unique features of sp2 hybridized carbon and stacked two-dimensional layered structures. However, unexpected volume/thickness changes in the graphite cathodes, induced by the intercalation/deintercalation of anions with large molecular size have been known to be a critical problem in designing DIB cells. To understand the volume/thickness changes in the DIB electrodes, in operando optical observing apparatus has been employed to observe the cross-section view of a graphite-based cathode upon cycles in the present work. The observation suggests that the cathode initially presented a huge irreversible thickness change (60%), and such thickness variation was prone to reduce and remain <20% in the following cycles. The results from both in operando observation and electrochemical characterizations collectively indicate that the greater thickness variation at initial cycle should be attributed to both anion intercalation into graphite-based cathodes and irreversible decomposition of chemical components in the DIB system. The method here highlights a universal route for fundamentally understanding the electrodes of huge volume variation.

Key words: Dual ion batteries, In operando optical observation, Graphite, Cathode, Thickness evolution