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Solid‐State Electrolyte Design for Lithium Dendrite Suppression

Journal Article · · Advanced Materials
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA
  2. Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA, Department of Chemistry and Biochemistry University of Maryland College Park MD 20742 USA

Abstract

All‐solid‐state Li metal batteries have attracted extensive attention due to their high safety and high energy density. However, Li dendrite growth in solid‐state electrolytes (SSEs) still hinders their application. Current efforts mainly aim to reduce the interfacial resistance, neglecting the intrinsic dendrite‐suppression capability of SSEs. Herein, the mechanism for the formation of Li dendrites is investigated, and Li‐dendrite‐free SSE criteria are reported. To achieve a high dendrite‐suppression capability, SSEs should be thermodynamically stable with a high interface energy against Li, and they should have a low electronic conductivity and a high ionic conductivity. A cold‐pressed Li 3 N–LiF composite is used to validate the Li‐dendrite‐free design criteria, where the highly ionic conductive Li 3 N reduces the Li plating/stripping overpotential, and LiF with high interface energy suppresses dendrites by enhancing the nucleation energy and suppressing the Li penetration into the SSEs. The Li 3 N–LiF layer coating on Li 3 PS 4 SSE achieves a record‐high critical current of >6 mA cm −2 even at a high capacity of 6.0 mAh cm −2 . The Coulombic efficiency also reaches a record 99% in 150 cycles. The Li 3 N–LiF/Li 3 PS 4 SSE enables LiCoO 2 cathodes to achieve 101.6 mAh g −1 for 50 cycles. The design principle opens a new opportunity to develop high‐energy all‐solid‐state Li metal batteries.

Sponsoring Organization:
USDOE
Grant/Contract Number:
EE0008856
OSTI ID:
1804192
Alternate ID(s):
OSTI ID: 1848913
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 46 Vol. 32; ISSN 0935-9648
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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