Influence of aliovalent doping on the structure and property  of Li2MnCl4chloride solid electrolyte

doi:10.52396/JUST-2021-0121

Journal of University of Science and Technology of China ›› 2021, Vol. 51 ›› Issue (8): 628-636.DOI: 10.52396/JUST-2021-0121

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Influence of aliovalent doping on the structure and property of Li₂MnCl₄chloride solid electrolyte

DUAN Chaomin, MA Cheng^*

Department of Materials Science & Engineering, University of Science and Technology of China, Hefei 230026, China

Received:2021-04-28 Revised:2021-05-19 Online:2021-08-31 Published:2022-01-14
Contact: *E-mail: mach16@ustc.edu.cn

Abstract

Abstract: A series of Li_2-xMn_1-xGa_xCl₄ (x=0, 0.1, 0.3, and 0.5) materials were synthesized with the mechanochemical approach. As confirmed by X-ray powder diffraction and Rietveld refinements, Ga³⁺can be successfully incorporated into the octahedral sites that are partially occupied by Mn²⁺.The as-milled materials with relatively low crystallinity generally exhibit higher ionic conductivity than the well crystallized ones produced by annealing at 250 ℃. Among all the materials studied,the as-milled Li_1.9Mn_0.9Ga_0.1Cl₄shows the highest ionic conductivity (8.3×10^-5 S·cm^-1), which is two orders of magnitude higher than that of the as-milled Li₂MnCl₄(7.12×10^-7 S·cm^-1). While the unit cell volume does not vary significantly with the composition, the appropriate Li vacancy content should play an important role in the optimized ionic conductivity of Li_1.9Mn_0.9Ga_0.1Cl₄.

Key words: aliovalent doping, chloride solid electrolyte, ionic conductivity

CLC Number:

TQ131.1

DUAN Chaomin, MA Cheng. Influence of aliovalent doping on the structure and property of Li₂MnCl₄chloride solid electrolyte[J]. Journal of University of Science and Technology of China, 2021, 51(8): 628-636.

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Influence of aliovalent doping on the structure and property of Li₂MnCl₄chloride solid electrolyte

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