Affiliation:
1. Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education School of Materials Science and Engineering Sun Yat‐sen University Guangzhou 510275 China
2. Department of Chemistry University of Liverpool Liverpool L7 3NY UK
Abstract
AbstractHigh room‐temperature ionic conductivity and good compatibility with lithium metal and cathode materials are prerequisites for solid‐state electrolytes used in lithium metal batteries. Here, the solid‐state polymer electrolytes (SSPE) are prepared by combining the traditional two‐roll milling technology with interface wetting. The as‐prepared electrolytes consisting of elastomer matrix and high‐mole‐loading of LiTFSI salt show a high room temperature ionic conductivity of 4.6×10−4 S cm−1, a good electrochemical oxidation stability up to 5.08 V, and improved interface stability. These phenomena are rationalized with the formation of continuous ion conductive paths based on sophisticated structure characterization including synchrotron radiation Fourier‐transform infrared microscopy, wide‐ and small‐angle X‐ray scattering. Moreover, at room temperature, the Li||SSPE||LFP coin cell shows a high capacity (161.5 mAh g−1 at 0.1 C), long‐cycle‐life (retaining 50% capacity and 99.8% Coulombic efficiency after 2000 cycles), and good C‐rate compatibility up to 5 C. This study, therefore, provides a promising solid‐state electrolyte that meets both the electrochemical and mechanical requirements of practical lithium metal batteries.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Subject
General Materials Science,General Chemistry
Cited by
10 articles.
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