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Title: An Electron/Ion Dual‐Conductive Alloy Framework for High‐Rate and High‐Capacity Solid‐State Lithium‐Metal Batteries

Journal Article · · Advanced Materials
ORCiD logo [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1]; ORCiD logo [1]
  1. Department of Materials Science and Engineering University of Maryland at College Park College Park MD 20742 USA
  2. Advanced Imaging and Microscopy (AIM) Lab of Nano Center University of Maryland at College Park College Park MD 20742 USA

Abstract The solid‐state Li battery is a promising energy‐storage system that is both safe and features a high energy density. A main obstacle to its application is the poor interface contact between the solid electrodes and the ceramic electrolyte. Surface treatment methods have been proposed to improve the interface of the ceramic electrolytes, but they are generally limited to low‐capacity or short‐term cycling. Herein, an electron/ion dual‐conductive solid framework is proposed by partially dealloying the Li–Mg alloy anode on a garnet‐type solid‐state electrolyte. The Li–Mg alloy framework serves as a solid electron/ion dual‐conductive Li host during cell cycling, in which the Li metal can cycle as a Li‐rich or Li‐deficient alloy anode, free from interface deterioration or volume collapse. Thus, the capacity, current density, and cycle life of the solid Li anode are improved. The cycle capability of this solid anode is demonstrated by cycling for 500 h at 1 mA cm −2 , followed by another 500 h at 2 mA cm −2 without short‐circuiting, realizing a record high cumulative capacity of 750 mA h cm −2 for garnet‐type all‐solid‐state Li batteries. This alloy framework with electron/ion dual‐conductive pathways creates the possibility to realize high‐energy solid‐state Li batteries with extended lifespans.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DE‐AR0000384
OSTI ID:
1483025
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Vol. 31 Journal Issue: 3; ISSN 0935-9648
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 198 works
Citation information provided by
Web of Science

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