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Salt‐Based Organic–Inorganic Nanocomposites: Towards A Stable Lithium Metal/Li 10 GeP 2 S 12 Solid Electrolyte Interface

Journal Article · · Angewandte Chemie
 [1];  [2];  [1];  [2];  [1];  [2]
  1. Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
  2. Department of Mechanical and Nuclear Engineering The Pennsylvania State University University Park PA 16802 USA

Abstract

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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
EE0008198
OSTI ID:
1472148
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 41 Vol. 130; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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