Journal of Energy Chemistry ›› 2023, Vol. 79 ›› Issue (4): 348-356.DOI: 10.1016/j.jechem.2023.01.008

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Li-richening strategy in Li2ZrCl6 lattice towards enhanced ionic conductivity

Haochang Zhanga,b, Zhaozhe Yua,*, Hannan Chenb, Yongjian Zhoub, Xiao Huangb,*, Bingbing Tianb,*   

  1. aGuangxi Key Laboratory of Manufacturing Systems and Advanced Manufacturing Technology, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China;
    bInternational Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, Guangdong, China
  • Received:2022-11-06 Revised:2022-12-27 Accepted:2023-01-09 Online:2023-04-15 Published:2023-05-30
  • Contact: * E-mail addresses: yuzhaozhe@guet.edu.cn (Z. Yu), hxzjy@mail.ustc.edu.cn (X. Huang), tianbb2011@szu.edu.cn (B. Tian).

Abstract: All-solid-state Li batteries (ASSLBs) with solid-state electrolytes (SSEs) are exciting candidates for next-generation energy storage and receive considerable attention owing to their reliability. Halide SSEs are promising candidates due to their excellent stability against 4 V-class layered cathodes. Compared with Li3InCl6 or Li3ScCl6, the low ionic conductivity of Li2ZrCl6 (LZC) is a challenge despite its low raw-material cost. Herein, we report a family of Li-Richened chloride, Li2+2xZr1-xMxCl6, which can be used in high-performance ASSLBs owing to its high ionic conductivity (up to 0.62 mS cm-1). The theoretical (ab initio molecular dynamics simulations) and experimental results prove that the strategy of aliovalent substitu-tion with divalent metals to obtain Li-Richened LZC is effective in improving Li+ conductivity in SSEs. By combining Li2.1Zr0.95Mg0.05Cl6 (Mg5-LZC) with a Li-In anode and a LiCoO2 cathode, a room-temperature ASSLBs with excellent long-term cycling stability (88% capacity retention at 0.3C for 100 cycles) and high-rate capability (121 mA h g-1 at 1C) is reported. This exploratory work sheds light on improving the Li+ conductivity of low-cost LZC-family SSEs for constructing high performance ASSLBs.

Key words: Li-richening, Li2ZrCl6, Halide solid electrolyte, All-solid-state battery, Solid electrochemistry, Li+ conductivity