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Na2ZrCl6 enabling highly stable 3 V all-solid-state Na-ion batteries

Na2ZrCl6 enabling highly stable 3 V all-solid-state Na-ion batteries
Kwak, HiramLyoo, JeynePark, JuhyounHan, YoonjaeAsakura, RyoRemhof, ArndtBattaglia, CorsinKim, HansuHong, Seung-TaeJung, Yoon Seok
DGIST 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
Energy Storage Materials, 37, 47-54
Author Keywords
All-solid-state batteriesHalidesIonic conductivitiesNa-ion batteriesSolid electrolytes
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 Na2ZrCl6 in 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. © 2021 Elsevier B.V.
Elsevier BV
Related Researcher
  • Author Hong, Seung-Tae Battery Materials Discovery Laboratory
  • Research Interests Magnesium, calcium, and zinc ion batteries; lithium all-solid-state batteries; Inorganic materials discovery; Solid state chemistry; Crystallography; Mg, Ca, Zn 이온 이차전지; 리튬 전고체전지; 신 무기재료 합성; 고체화학; 결정화학
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Department of Energy Science and EngineeringBattery Materials Discovery Laboratory1. Journal Articles

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