SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 37 ›› Issue (9): 152-158.DOI: 10.1016/j.cjche.2021.03.021

• Energy Science and Technology • 上一篇    下一篇

Stable interfaces constructed by concentrated ether electrolytes to render robust lithium metal batteries

He Liu1,2, Tao Li3, Xiangqun Xu4, Peng Shi4, Xueqiang Zhang4, Rui Xu1,2, Xinbing Cheng4, Jiaqi Huang2   

  1. 1. School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China;
    2. Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China;
    3. School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China;
    4. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • 收稿日期:2021-01-17 修回日期:2021-03-05 出版日期:2021-09-28 发布日期:2021-11-02
  • 通讯作者: Jiaqi Huang
  • 基金资助:
    This work was supported by Beijing Natural Science Foundation (JQ20004), National Natural Science Foundation of China (21805161, 21808121, and U1932220), China Post-Doctoral Science Foundation (2020M670155 and 2020T130054), Scientific and Technological Key Project of Shanxi Province (20191102003).

Stable interfaces constructed by concentrated ether electrolytes to render robust lithium metal batteries

He Liu1,2, Tao Li3, Xiangqun Xu4, Peng Shi4, Xueqiang Zhang4, Rui Xu1,2, Xinbing Cheng4, Jiaqi Huang2   

  1. 1. School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China;
    2. Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China;
    3. School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China;
    4. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2021-01-17 Revised:2021-03-05 Online:2021-09-28 Published:2021-11-02
  • Contact: Jiaqi Huang
  • Supported by:
    This work was supported by Beijing Natural Science Foundation (JQ20004), National Natural Science Foundation of China (21805161, 21808121, and U1932220), China Post-Doctoral Science Foundation (2020M670155 and 2020T130054), Scientific and Technological Key Project of Shanxi Province (20191102003).

摘要: Lithium metal batteries (LMBs) are highly considered as promising candidates for next-generation energy storage systems. However, routine electrolytes cannot tolerate the high potential at cathodes and low potential at anodes simultaneously, leading to severe interfacial reactions. Herein, a highly concentrated electrolyte (HCE) region trapped in porous carbon coating layer is adopted to form a stable and highly conductive solid electrolyte interphase (SEI) on Li metal surface. The protected Li metal anode can potentially match the high-voltage cathode in ester electrolytes. Synergistically, this ingenious design promises high-voltage-resistant interfaces at cathodes and stable SEI with abundance of inorganic components at anodes simultaneously in high-voltage LMBs. The feasibility of this interface-regulation strategy is demonstrated in Li|LiFePO4 batteries, realizing a lifespan twice as long as the routine cells, with a huge capacity retention enhancement from 46.4% to 88.7% after 100 cycles. This contribution proof-of-concepts the emerging principles on the formation and regulation of stable electrode/electrolyte interfaces in the cathode and anode simultaneously towards the next-generation high-energy-density batteries.

关键词: Lithium metal anode, Dendrite, Solid electrolyte interphase, Ester electrolyte, Highly concentrated ether electrolyte

Abstract: Lithium metal batteries (LMBs) are highly considered as promising candidates for next-generation energy storage systems. However, routine electrolytes cannot tolerate the high potential at cathodes and low potential at anodes simultaneously, leading to severe interfacial reactions. Herein, a highly concentrated electrolyte (HCE) region trapped in porous carbon coating layer is adopted to form a stable and highly conductive solid electrolyte interphase (SEI) on Li metal surface. The protected Li metal anode can potentially match the high-voltage cathode in ester electrolytes. Synergistically, this ingenious design promises high-voltage-resistant interfaces at cathodes and stable SEI with abundance of inorganic components at anodes simultaneously in high-voltage LMBs. The feasibility of this interface-regulation strategy is demonstrated in Li|LiFePO4 batteries, realizing a lifespan twice as long as the routine cells, with a huge capacity retention enhancement from 46.4% to 88.7% after 100 cycles. This contribution proof-of-concepts the emerging principles on the formation and regulation of stable electrode/electrolyte interfaces in the cathode and anode simultaneously towards the next-generation high-energy-density batteries.

Key words: Lithium metal anode, Dendrite, Solid electrolyte interphase, Ester electrolyte, Highly concentrated ether electrolyte