High Ionic Conductivity Achieved in Li3Y(Br3Cl3) Mixed Halide Solid Electrolyte via Promoted Diffusion Pathways and Enhanced Grain Boundary

Zhantao Liu; Shuan Ma; Jue Liu; Shan Xiong; Yifan Ma; Hailong Chen

doi:10.1021/acsenergylett.0c01690

High Ionic Conductivity Achieved in Li₃Y(Br₃Cl₃) Mixed Halide Solid Electrolyte via Promoted Diffusion Pathways and Enhanced Grain Boundary

Zhantao Liu, Shuan Ma, Jue Liu, Shan Xiong, Yifan Ma, Hailong Chen

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Research output: Contribution to journal › Article › peer-review

118 Scopus citations

Abstract

The development of all-solid-state batteries is limited by the low ionic conductivity of solid electrolytes. Beyond sulfides and oxides, halides represent another family of solid electrolytes with high Li+ conductivity and good stability. Here we report the design, synthesis, electrochemical testing, and crystal structure characterization of a halide compound, Li3Y(Br3Cl3). A room-temperature conductivity of 7.2 mS/cm is achieved in Li3Y(Br3Cl3) via hot-pressing at 170 °C. Crystal structure characterizations using synchrotron X-ray and neutron diffraction reveal the existence of Li at the tetrahedral sites and the 3D diffusion pathways. Electrochemical impedance spectroscopy results reveal the improved grain boundary contact and the lower grain boundary resistance after the hot-pressing process, which also boost the overall conductivity. All-solid-state batteries using Li3Y(Br3Cl3) as the electrolyte demonstrate high capacity and good rate performance at room temperature. The new findings open up opportunities for the design of halide ionic conductors and the development of all-solid-state batteries.

Original language	English
Pages (from-to)	298-304
Number of pages	7
Journal	ACS Energy Letters
Volume	6
Issue number	1
DOIs	https://doi.org/10.1021/acsenergylett.0c01690
State	Published - Jan 8 2021

Funding

Z.L., S.X., and H.C. acknowledge the financial support by National Science Foundation under grant number CBET-1706723 and by Georgia Tech. The use of the Advanced Photon Source was supported by the U.S. Department of Energy, Office of Science, through the general user programs. A portion of this research used resources at the Spallation Neutron Source (SNS), a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

Funders	Funder number
National Science Foundation	CBET-1706723
U.S. Department of Energy
Office of Science
Oak Ridge National Laboratory

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10.1021/acsenergylett.0c01690

Cite this

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title = "High Ionic Conductivity Achieved in Li3Y(Br3Cl3) Mixed Halide Solid Electrolyte via Promoted Diffusion Pathways and Enhanced Grain Boundary",

abstract = "The development of all-solid-state batteries is limited by the low ionic conductivity of solid electrolytes. Beyond sulfides and oxides, halides represent another family of solid electrolytes with high Li+ conductivity and good stability. Here we report the design, synthesis, electrochemical testing, and crystal structure characterization of a halide compound, Li3Y(Br3Cl3). A room-temperature conductivity of 7.2 mS/cm is achieved in Li3Y(Br3Cl3) via hot-pressing at 170 °C. Crystal structure characterizations using synchrotron X-ray and neutron diffraction reveal the existence of Li at the tetrahedral sites and the 3D diffusion pathways. Electrochemical impedance spectroscopy results reveal the improved grain boundary contact and the lower grain boundary resistance after the hot-pressing process, which also boost the overall conductivity. All-solid-state batteries using Li3Y(Br3Cl3) as the electrolyte demonstrate high capacity and good rate performance at room temperature. The new findings open up opportunities for the design of halide ionic conductors and the development of all-solid-state batteries.",

author = "Zhantao Liu and Shuan Ma and Jue Liu and Shan Xiong and Yifan Ma and Hailong Chen",

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AU - Liu, Jue

AU - Xiong, Shan

AU - Ma, Yifan

AU - Chen, Hailong

PY - 2021/1/8

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AB - The development of all-solid-state batteries is limited by the low ionic conductivity of solid electrolytes. Beyond sulfides and oxides, halides represent another family of solid electrolytes with high Li+ conductivity and good stability. Here we report the design, synthesis, electrochemical testing, and crystal structure characterization of a halide compound, Li3Y(Br3Cl3). A room-temperature conductivity of 7.2 mS/cm is achieved in Li3Y(Br3Cl3) via hot-pressing at 170 °C. Crystal structure characterizations using synchrotron X-ray and neutron diffraction reveal the existence of Li at the tetrahedral sites and the 3D diffusion pathways. Electrochemical impedance spectroscopy results reveal the improved grain boundary contact and the lower grain boundary resistance after the hot-pressing process, which also boost the overall conductivity. All-solid-state batteries using Li3Y(Br3Cl3) as the electrolyte demonstrate high capacity and good rate performance at room temperature. The new findings open up opportunities for the design of halide ionic conductors and the development of all-solid-state batteries.

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