能源化学(英文版)

能源化学(英文版) ›› 2020, Vol. 41 ›› Issue (2): 100-106.DOI: 10.1016/j.jechem.2019.04.018

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A semiconductor-electrochemistry model for design of high-rate Li ion battery

Wei Zhanga,c,d, Dong Wanga,b, Weitao Zhenga   

  1. a Key Laboratory of Mobile Materials MOE, and School of Materials Science & Engineering, and International Center of Future Science, and Electron Microscopy Center, Jilin University, Changchun 130012, Jilin, China;
    b State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Provincial Hunan Key Laboratory for Graphene Materials and Devices, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, China;
    c Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China;
    d IKERBASQUE, Basque Foundation for Science, Bilbao 48013, Spain
  • 收稿日期:2019-03-01 修回日期:2019-04-11 出版日期:2020-02-15 发布日期:2020-12-18
  • 基金资助:
    The authors are grateful for the National Natural Science Foundation of China (51872115), Program for the Development of Science and Technology of Jilin Province (20190201309JC), the Fundamental Research Funds for the Central Universities (Grant no.531107051230). The Open Project Program of Wuhan National Laboratory for Optoelectronics, the Jilin Province/Jilin University co-Construction Project-Funds for New Materials (SXGJSF2017-3, Branch-2/440050316A36), Program for JLU Science and Technology Innovative Research Team (JLUSTIRT, 2017TD-09), the Fundamental Research Funds for the Central Universities, JLU, and “Double-First Class” Discipline for Materials Science & Engineering.

A semiconductor-electrochemistry model for design of high-rate Li ion battery

Wei Zhanga,c,d, Dong Wanga,b, Weitao Zhenga   

  1. a Key Laboratory of Mobile Materials MOE, and School of Materials Science & Engineering, and International Center of Future Science, and Electron Microscopy Center, Jilin University, Changchun 130012, Jilin, China;
    b State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Provincial Hunan Key Laboratory for Graphene Materials and Devices, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, China;
    c Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China;
    d IKERBASQUE, Basque Foundation for Science, Bilbao 48013, Spain
  • Received:2019-03-01 Revised:2019-04-11 Online:2020-02-15 Published:2020-12-18
  • Contact: Wei Zhang, Dong Wang, Weitao Zheng
  • Supported by:
    The authors are grateful for the National Natural Science Foundation of China (51872115), Program for the Development of Science and Technology of Jilin Province (20190201309JC), the Fundamental Research Funds for the Central Universities (Grant no.531107051230). The Open Project Program of Wuhan National Laboratory for Optoelectronics, the Jilin Province/Jilin University co-Construction Project-Funds for New Materials (SXGJSF2017-3, Branch-2/440050316A36), Program for JLU Science and Technology Innovative Research Team (JLUSTIRT, 2017TD-09), the Fundamental Research Funds for the Central Universities, JLU, and “Double-First Class” Discipline for Materials Science & Engineering.

摘要： For designing batteries with high-rate and long-life, electronic/ionic transport and reaction must be unified for metal oxide electrodes. However, it remains challenging for effectively integrating the whole substrate/active materials/electrolyte interfaces. Herein by taking Li ion battery as example, we propose a semiconductor-electrochemistry model by which a general but novel insight has been gained into interfacial effect in batteries. Different from those traditional viewpoints, this derived model lies across from physics to electrochemistry. A reaction driving force can be expressed in terms of Fermi energy change, based on the tradeoff between electronic and ionic concentration at the reaction interfacial region. Therefore, at thermodynamic-controlled interface I of substrate/electrode, increasing contact areas can afford higher activity for active materials. Whereas at kinetically-governed interface II of electrode/electrolyte or inside active materials, it is crucial to guarantee high-reaction Li ionic concentration, with which some sufficient reaction degrees can reach.

关键词: Semiconductor electrochemistry, Interface, Surface, Fermi energy, SEI

Abstract: For designing batteries with high-rate and long-life, electronic/ionic transport and reaction must be unified for metal oxide electrodes. However, it remains challenging for effectively integrating the whole substrate/active materials/electrolyte interfaces. Herein by taking Li ion battery as example, we propose a semiconductor-electrochemistry model by which a general but novel insight has been gained into interfacial effect in batteries. Different from those traditional viewpoints, this derived model lies across from physics to electrochemistry. A reaction driving force can be expressed in terms of Fermi energy change, based on the tradeoff between electronic and ionic concentration at the reaction interfacial region. Therefore, at thermodynamic-controlled interface I of substrate/electrode, increasing contact areas can afford higher activity for active materials. Whereas at kinetically-governed interface II of electrode/electrolyte or inside active materials, it is crucial to guarantee high-reaction Li ionic concentration, with which some sufficient reaction degrees can reach.

Key words: Semiconductor electrochemistry, Interface, Surface, Fermi energy, SEI