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Salt‐Based Organic–Inorganic Nanocomposites: Towards A Stable Lithium Metal/Li 10 GeP 2 S 12 Solid Electrolyte Interface
Author(s) -
Gao Yue,
Wang Daiwei,
Li Yuguang C.,
Yu Zhaoxin,
Mallouk Thomas E.,
Wang Donghai
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201807304
Subject(s) - electrolyte , nanocomposite , electrochemistry , lithium (medication) , chemical engineering , materials science , x ray photoelectron spectroscopy , lithium battery , metal , inorganic chemistry , chemistry , nanotechnology , electrode , organic chemistry , ion , metallurgy , ionic bonding , medicine , endocrinology , engineering
Solid‐state Li metal battery technology is attractive, owing to the high energy density, long lifespans, and better safety. A key obstacle in this technology is the unstable Li/solid‐state electrolyte (SSE) interface involving electrolyte reduction by Li. Herein we report a novel approach based on the use of a nanocomposite consisting of organic elastomeric salts (LiO‐(CH 2 O) n ‐Li) and inorganic nanoparticle salts (LiF, ‐NSO 2 ‐Li, Li 2 O), which serve as an interphase to protect Li 10 GeP 2 S 12 (LGPS), a highly conductive but reducible SSE. The nanocomposite is formed in situ on Li via the electrochemical decomposition of a liquid electrolyte, thus having excellent chemical and electrochemical stability, affinity for Li and LGPS, and limited interfacial resistance. XPS depth profiling and SEM show that the nanocomposite effectively restrained the reduction of LGPS. Stable Li electrodeposition over 3000 h and a 200 cycle life for a full cell were achieved.