Li2 S6 -Integrated PEO-Based Polymer Electrolytes for All-Solid-State Lithium-Metal Batteries

Ruyi Fang; Biyi Xu; Nicholas S Grundish; Yang Xia; Yutao Li; Chengwei Lu; Yijie Liu; Nan Wu; John B Goodenough

doi:10.1002/anie.202106039

Li₂ S₆ -Integrated PEO-Based Polymer Electrolytes for All-Solid-State Lithium-Metal Batteries

Angew Chem Int Ed Engl. 2021 Aug 2;60(32):17701-17706. doi: 10.1002/anie.202106039. Epub 2021 Jun 30.

Authors

Ruyi Fang¹, Biyi Xu¹, Nicholas S Grundish¹, Yang Xia², Yutao Li¹, Chengwei Lu², Yijie Liu¹, Nan Wu¹, John B Goodenough¹

Affiliations

¹ Materials Science and Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA.
² College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, China.

PMID: 34192402
DOI: 10.1002/anie.202106039

Abstract

The integration of Li₂ S₆ within a poly(ethylene oxide) (PEO)-based polymer electrolyte is demonstrated to improve the polymer electrolyte's ionic conductivity because the strong interplay between O^2- _(PEO) and Li⁺ from Li₂ S₆ reduces the crystalline volume within the PEO. The Li/electrolyte interface is stabilized by the in situ formation of an ultra-thin Li₂ S/Li₂ S₂ layer via the reaction between Li₂ S₆ and lithium metal, which increases the ionic transport at the interface and suppresses lithium dendrite growth. A symmetric Li/Li cell with the Li₂ S₆ -integrated composite electrolyte has excellent cyclability and a high critical current density of 0.9 mA cm^-2 at 40 °C. Impressive electrochemical performance is demonstrated with all-solid-state Li/LiFePO₄ and high-voltage Li/LiNi_0.8 Mn_0.1 Co_0.1 O₂ cells at 40 °C.

Keywords: Li+ conductivity; Li2S6; all-solid-state battery; composite electrolyte; poly(ethylene oxide).

Abstract

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