Hybrid Polymer/Garnet Electrolyte with a Small Interfacial Resistance for Lithium-Ion Batteries

Yutao Li; Biyi Xu; Henghui Xu; Huanan Duan; Xujie Lü; Sen Xin; Weidong Zhou; Leigang Xue; Gengtao Fu; Arumugam Manthiram; John B Goodenough

doi:10.1002/anie.201608924

Hybrid Polymer/Garnet Electrolyte with a Small Interfacial Resistance for Lithium-Ion Batteries

Angew Chem Int Ed Engl. 2017 Jan 16;56(3):753-756. doi: 10.1002/anie.201608924. Epub 2016 Dec 9.

Authors

Affiliations

¹ Materials Science and Engineering Program and Texas Materials Institute, University of Texas at Austin, Austin, TX, 78712, USA.
² State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China.
³ Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.

PMID: 27936306
DOI: 10.1002/anie.201608924

Abstract

Li₇ La₃ Zr₂ O₁₂ -based Li-rich garnets react with water and carbon dioxide in air to form a Li-ion insulating Li₂ CO₃ layer on the surface of the garnet particles, which results in a large interfacial resistance for Li-ion transfer. Here, we introduce LiF to garnet Li_6.5 La₃ Zr_1.5 Ta_0.5 O₁₂ (LLZT) to increase the stability of the garnet electrolyte against moist air; the garnet LLZT-2 wt % LiF (LLZT-2LiF) has less Li₂ CO₃ on the surface and shows a small interfacial resistance with Li metal, a solid polymer electrolyte, and organic-liquid electrolytes. An all-solid-state Li/polymer/LLZT-2LiF/LiFePO₄ battery has a high Coulombic efficiency and long cycle life; a Li-S cell with the LLZT-2LiF electrolyte as a separator, which blocks the polysulfide transport towards the Li-metal, also has high Coulombic efficiency and kept 93 % of its capacity after 100 cycles.

Keywords: Li-S battery; Li-rich garnet; all-solid-state battery; interfacial resistance; lithium fluoride.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.