Antiperovskite Ionic Conductor Layer for Stabilizing the Interface of NASICON Solid Electrolyte Against Li Metal in All‐Solid‐State Batteries. Issue 9 (9th July 2021)

• Record Type: Journal Article
• Authors: Gao, Lei; Zhao, Ruo; Han, Songbai; Li, Shuai; Zou, Ruqiang; Zhao, Yusheng
• Is Part Of: Batteries & supercaps. Volume 4:Issue 9(2021)
• Page Start: 1491
• Page End: 1498
• Publication Date: 2021-07-09
• Subjects: solid-state electrolytes -- all-solid-state lithium batteries -- antiperovskite -- NASICON -- interface; Electrochemistry -- Periodicals; Electrodes -- Periodicals; Electric batteries -- Periodicals; 621.31242
• DOI: 10.1002/batt.202100123
• Languages: English
• ISSNs: 2566-6223

Abstract

Abstract: The instability of the interface between solid‐state electrolytes (SSEs) and Li metal anodes is a critical factor restricting the application of NASICON‐type ionic conductors in all‐solid‐state lithium batteries (ASSLBs). Here, the lithium‐rich antiperovskite (LiRAP) Li2 OHBr ionic conductor is introduced as a protective layer for the NASICON‐type solid electrolyte Li1.5 Al0.5 Ge1.5 (PO4 )3 (LAGP) by a simple way of rapid solidification of molten Li2 OHBr, to prevent the adverse reaction caused by direct contact between LAGP and Li metal. The Li/Li symmetric cells with Li2 OHBr protective layer exhibit long‐term cycle stability compared with the bare LAGP, and the mechanisms are analyzed by XPS measurements for the interface between SSEs and Li metal. Also, the LiFePO4 /Li ASSLBs have been assembled to further demonstrate this advantage. This work shows that LiRAP Li2 OHBr can improve the cycling stability of ASSLBs from the perspective of Li metal anode protection. Abstract : Solid conductor : Taking the advantage of the low melting point of the antiperovskite ionic conductor, the antiperovskite Li2 OHBr protective layer on the surface of NASICON solid electrolyte (LAGP) was formed by a simple method of rapid solidification of molten Li2 OHBr, which significantly improved the stability of the interface between LAGP and Li metal.