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Title: Materials design of sodium chloride solid electrolytes Na3MCl6 for all-solid-state sodium-ion batteries

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/d1ta07050a· OSTI ID:1844069
 [1];  [2];  [1];  [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Korea Institute of Science and Technology, Seoul (Korea, Republic of); Korea Univ., Seoul, (Korea, Republic of)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Korea Univ., Seoul, (Korea, Republic of)
  4. Korea Institute of Science and Technology, Seoul (Korea, Republic of); Korea Univ. of Science and Technology, Seoul, (Korea, Republic of)

All-solid-state sodium-ion batteries have attracted increasing attention owing to the low cost of sodium and the enhanced safety compared to conventional Li-ion batteries. Recently, halides have been considered as promising solid electrolytes (SEs) due to their favorable combination of high ionic conductivity and chemical stability against high-voltage cathode materials. Although a wide variety of lithium chloride SEs, Li3MCl6, have been developed for high-voltage all-solid-state batteries, only a limited number of sodium chloride SEs have been reported. This study aims to offer a material design insight for the development of sodium chloride SEs through systematic assessment of the phase stability, electrochemical stability, and transport properties of novel Na3MCl6 SEs. Structural calculations indicate that Na3MCl6 exhibits trigonal $$P\bar{3}$$1c, monoclinic P21/n, and trigonal $$R\bar{3}$$ phases, and the stable phase of Na3MCl6 is dependent on the type and ionic radius of M. Na3MCl6 typically exhibits a high oxidation potential, demonstrating good electrochemical stability against cathodes. The bond-valence site energy and ab initio molecular dynamics calculations revealed that Na3MCl6 with P21/n and $$R\bar{3}$$ phases showed low ionic conductivity, while the $$P\bar{3}$$1c phase slightly improved the ionic conductivity of Na3MCl6. The formation of Na vacancies by aliovalent substitution considerably increased the ionic conductivity up to four orders of magnitude for pristine Na3MCl6, exhibiting ~10–5 S cm–1 for trigonal $$P\bar{3}$$1c and $$R\bar{3}$$ phases. The formation of defects could further enhance the ionic conductivity of Na3MCl6, and the optimization of defect type and ratio can be helpful in developing superionic Na chloride SEs. The material design of Na3MCl6 in this study will provide fundamental guidelines for the development of novel sodium halide SEs for all-solid-state sodium-ion batteries.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; National Research Foundation of Korea (NRF); Ministry of Trade, Industry & Energy of Korea; Korea Institute of Science and Technology; USDOE
Grant/Contract Number:
AC52-07NA27344; 2017M1A2A2044482; 20012318; 2E30992
OSTI ID:
1844069
Alternate ID(s):
OSTI ID: 1824865
Report Number(s):
LLNL-JRNL-825812; 1039236
Journal Information:
Journal of Materials Chemistry. A, Vol. 9, Issue 40; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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