Open AccessInterface Modification of lithium Metal Anode and Solid-state Electrolyte with Gel Electrolyte
Author(s) -
Lawrence A. Renna,
Francois-Guillame Blanc,
Vincent Giordani
Publication year - 2020
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ab7fb7
Subject(s) - electrolyte , thermogravimetric analysis , anode , lithium (medication) , materials science , ethylene oxide , lithium perchlorate , chemical engineering , oxide , conductivity , wetting , inorganic chemistry , ionic conductivity , electrode , polymer , chemistry , composite material , metallurgy , medicine , engineering , copolymer , endocrinology
The interface between solid electrolytes and Li metal anode is a significant hurdle for the development of all-solid-state lithium metal batteries. Introducing a thin gel polymer electrolyte interlayer to conformally coat solid electrolytes can improve the interface wettability of Li metal anode and thus reduce the interfacial resistance. Here we used a plasticized poly(ethylene oxide)-based electrolyte with high concentrations of bis(trifluoromethane)sulfonamide lithium (LiTFSI) that show 100% amorphous character. These electrolytes show Li + conductivity as high as σ = 2.9 × 10 −4 S cm −1 at room temperature. We discovered by thermogravimetric analysis (TGA) with off-gas analysis in conjunction with nuclear magnetic resonance (NMR) spectroscopy that the electrolyte films had absorbed N -methyl-2-pyrrolidone (NMP) vapors to form a gel electrolyte. We incorporated the gel electrolyte as an interfacial modification layer between LLZO and Li metal electrodes and found a 58 times reduction in the area specific resistance (ASR) at room temperature.