Na₂ZrCl₆ enabling highly stable 3 V all-solid-state Na-ion batteries
- Authors
- Kwak, Hiram; Lyoo, Jeyne; Park, Juhyoun; Han, Yoonjae; Asakura, Ryo; Remhof, Arndt; Battaglia, Corsin; Kim, Hansu; Hong, Seung-Tae; Jung, Yoon Seok
- Issue Date
- May-2021
- Publisher
- Elsevier B.V.
- Keywords
- All-solid-state batteries; Solid electrolytes; Halides; Ionic conductivities; Na-ion batteries
- Citation
- Energy Storage Materials, v.37, pp.47 - 54
- Indexed
- SCIE
SCOPUS
- Journal Title
- Energy Storage Materials
- Volume
- 37
- Start Page
- 47
- End Page
- 54
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1475
- DOI
- 10.1016/j.ensm.2021.01.026
- ISSN
- 2405-8297
- Abstract
- Halide solid electrolytes (SEs) are emerging as an alternative to sulfide and/or oxide SEs for applications in all-solid-state batteries owing to the advantage fulfilling high (electro)chemical stability and mechanical sinterability at the same time. Thus far, the developments in halide SEs have focused on Li+ superionic conductors. Herein, the development of a new Na+-conducting halide SE, mechanochemically prepared Na₂ZrCl₆ (1.8 × 10−5 S cm−1 at 30°C) with excellent oxidative electrochemical stability, is described. A trigonal crystal structure with the P3¯m1 symmetry is successfully identified by the Rietveld refinement of X-ray diffraction. Additionally, the bond valence sum energy level calculations disclose one-dimensional preferable Na+-diffusion channels in Na₂ZrCl₆. It is to be noted that despite the rather low Na+ conductivity of Na₂ZrCl₆, NaCrO₂ electrodes that uses Na₂ZrCl₆in NaCrO₂/Na-Sn all-solid-state Na-ion batteries demonstrate an exceptionally high initial Coulombic efficiency of 93.1% and a high reversible capacity of 111 mA h g−1 at 0.1C and 30 °C (98.4% and 123 mA h g−1 at 60 °C), highlighting the excellent electrochemical stability of Na₂ZrCl₆.
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