异价掺杂对Li2MnCl4氯化物固态电解质结构和性能的影响

doi:10.52396/JUST-2021-0121

中国科学技术大学学报 ›› 2021, Vol. 51 ›› Issue (8): 628-636.DOI: 10.52396/JUST-2021-0121

异价掺杂对Li₂MnCl₄氯化物固态电解质结构和性能的影响

段超民, 马骋^*

中国科学技术大学材料科学与工程系,安徽合肥 230026

收稿日期:2021-04-28 修回日期:2021-05-19 出版日期:2021-08-31 发布日期:2022-01-14
通讯作者: *E-mail:mach16@ustc.edu.cn

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

摘要/Abstract

摘要： 一系列Li_2-xMn_1-xGa_xCl₄(x=0, 0.1, 0.3, 0.5)可以通过机械化学的方法合成.根据X射线衍射以及Rietveld结构精修,Ga³⁺成功进入了被Mn²⁺部分占据的八面体位点.刚经过球磨的、具有较低结晶度的材料整体上在离子电导率方面优于结晶良好、经过250 ℃退火的材料.刚经过球磨的Li_1.9Mn_0.9Ga_0.1Cl₄在所有样品中展现出了最高的离子电导率(8.3×10^-5 S·cm^-1),比刚球磨过的Li₂MnCl₄(7.12×10^-7 S·cm^-1)高两个数量级.由于晶胞尺寸并没有随着成分发生显著变化,Li_1.9Mn_0.9Ga_0.1Cl₄的最优离子电导率应主要来源于合适的Li空位含量.

关键词: 异价掺杂, 氯化物固态电解质, 离子电导率

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

中图分类号:

TQ131.1

段超民, 马骋. 异价掺杂对Li₂MnCl₄氯化物固态电解质结构和性能的影响[J]. 中国科学技术大学学报, 2021, 51(8): 628-636.

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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异价掺杂对Li₂MnCl₄氯化物固态电解质结构和性能的影响

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

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