Stabilizing Li10SnP2S12/Li Interface via an in Situ Formed Solid Electrolyte Interphase Layer

• DOI: 10.1021/acsami.8b08860
• Publication Date: 2018-07-10T14:56:15Z
• Authors: Bizhu Zheng; Jianping Zhu; Hongchun Wang; Min Feng; Ediga Umeshbabu; Yixiao Li; Qi-Hui Wu; Yong Yang
• Keywords: Interphase; Interface (matter)

Despite the extremely high ionic conductivity, commercialization of Li10GeP2S12-type materials is hindered by poor stability against Li metal. Herein, to address that issue, a simple strategy proposed and demonstrated for first time, i.e., in situ modification interface between metal Li10SnP2S12 (LSPS) pretreatment with specific liquid salts. X-ray photoelectron spectroscopy electrochemical impedance results reveal stable solid electrolyte interphase (SEI) layer instead mixed conducting formed on adding 1.5 M lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)/N-propyl-N-methyl pyrrolidinium (Pyr13TFSI) liquid, where not only acts as wetting agent but also improves at Li/LSPS interface. This SEI can prevent LSPS from directly contacting further decomposition, Li/LSPS/Li symmetric cell LiTFSI/Pyr13TFSI attains cycle life over 1000 h both charge discharge voltages reaching about 50 mV 0.038 mA cm–2. Furthermore, effects different salts interfacial compared investigated. It shown bis(fluorosulfonyl) imide (LiFSI) salt causes enrichment LiF higher resistance upon long cycling life.