Title: New Cost-Effective Halide Solid Electrolytes for All-Solid-State Batteries: Mechanochemically Prepared Fe3+-Substituted Li2ZrCl6

Journal Article · · Advanced Energy Materials
 [1];  [2];  [3];  [1];  [4];  [1];  [5];  [6];  [3]; ORCiD logo [2]; ORCiD logo [4]
  1. Yonsei Univ., Seoul (Korea, Republic of); Hanyang Univ., Seoul (Korea, Republic of)
  2. Dongguk Univ., Seoul (Korea, Republic of)
  3. Daegu Gyeongbuk Inst. of Science and Technology (DGIST) (Korea, Republic of)
  4. Yonsei Univ., Seoul (Korea, Republic of)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  6. Hanyang Univ., Seoul (Korea, Republic of)
+ Show Author Affiliations

Owing to the combined advantages of sulfide and oxide solid electrolytes (SEs), that is, mechanical sinterability and excellent (electro)chemical stability, recently emerging halide SEs such as Li3YCl6 are considered to be a game changer for the development of all-solid-state batteries. However, the use of expensive central metals hinders their practical applicability. In this study, a new halide superionic conductors are reported that are free of rare-earth metals: hexagonal close-packed (hcp) Li2ZrCl6 and Fe3+-substituted Li2ZrCl6, derived via a mechanochemical method. Conventional heat treatment yields cubic close-packed monoclinic Li2ZrCl6 with a low Li+ conductivity of 5.7 × 10–6 S cm–1 at 30 °C. In contrast, hcp Li2ZrCl6 with a high Li+ conductivity of 4.0 × 10–4 S cm–1 is derived via ball-milling. More importantly, the aliovalent substitution of Li2ZrCl6 with Fe3+, which is probed by complementary analyses using X-ray diffraction, pair distribution function, X-ray absorption spectroscopy, and Raman spectroscopy measurements, drastically enhances the Li+ conductivity up to ≈1 mS cm–1 for Li2.25Zr0.75Fe0.25Cl6. The superior interfacial stability when using Li2+xZr1–xFexCl6, as compared to that when using conventional Li6PS5Cl, is proved. Furthermore, an excellent electrochemical performance of the all-solid-state batteries is achieved via the combination of Li2ZrCl6 and single-crystalline LiNi0.88Co0.11Al0.01O2.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Sponsoring Organization:
Korean Ministry of Trade, Industry & Energy (MOTIE); National Research Foundation of Korea (NRF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1766778
Report Number(s):
BNL-221043-2021-JAAM
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 12 Vol. 11; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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25 ENERGY STORAGE
electrodes
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solid electrolytes
solid-state batteries