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Song J, Liao K, Si J, Zhao C, Wang J, Zhou M, Liang H, Gong J, Cheng YJ, Gao J, Xia Y. Phosphonate-Functionalized Ionic Liquid Gel Polymer Electrolyte with High Safety for Dendrite-Free Lithium Metal Batteries. ACS APPLIED MATERIALS & INTERFACES 2023; 15:2901-2910. [PMID: 36602816 DOI: 10.1021/acsami.2c18298] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The conventional lithium-ion battery technology relies on the liquid carbonate-based electrolyte solution, which causes excessive side reactions, serious risk of electrolyte leakage, high flammability, and significant safety hazards. In this work, phosphonate-functionalized imidazolium ionic liquid (PFIL) is synthesized and used as a gel polymer electrolyte (GPE) to replace the organic carbonate-based electrolyte solution. The as-prepared ionic liquid-based gel polymer electrolyte (IL-GPE) shows low crystallinity, flame retardance, and excellent electrochemical performance. Thanks to the fast double channel transport of lithium ions in the IL-GPE electrolyte, a high ionic conductivity of 0.48 mS cm-1 and a lithium-ion transference number of 0.37 are exhibited. Symmetrical lithium cells with IL-GPE retain stable cycling even after 3000 h under 0.1 mA cm-2. IL-GPE exhibits good compatibility toward lithium metal, yielding excellent long-term electrochemical kinetic stability. IL-GPE induces the formation of a uniform and robust SEI layer, inhibiting the growth of lithium dendrites and improving the rate performance and cycle stability. Furthermore, Li/LiFePO4 cells exhibit a specific capacity of 63 mA h g-1 after 150 cycles at 5.0 C, with a capacity retention of 90.2%. It is foreseen that this GPE is a promising candidate to enhance the safety of high-performance lithium metal batteries.
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Affiliation(s)
- Jingbo Song
- The School of Materials Science and Chemical Engineering, Ningbo University, 818 Fenghua Road, Ningbo315211, Zhejiang Province, P. R. China
| | - Kaisi Liao
- The School of Materials Science and Chemical Engineering, Ningbo University, 818 Fenghua Road, Ningbo315211, Zhejiang Province, P. R. China
| | - Jia Si
- The School of Materials Science and Chemical Engineering, Ningbo University, 818 Fenghua Road, Ningbo315211, Zhejiang Province, P. R. China
| | - Chuanli Zhao
- The School of Materials Science and Chemical Engineering, Ningbo University, 818 Fenghua Road, Ningbo315211, Zhejiang Province, P. R. China
| | - Junping Wang
- The School of Materials Science and Chemical Engineering, Ningbo University, 818 Fenghua Road, Ningbo315211, Zhejiang Province, P. R. China
| | - Mingjiong Zhou
- The School of Materials Science and Chemical Engineering, Ningbo University, 818 Fenghua Road, Ningbo315211, Zhejiang Province, P. R. China
| | - Hongze Liang
- The School of Materials Science and Chemical Engineering, Ningbo University, 818 Fenghua Road, Ningbo315211, Zhejiang Province, P. R. China
| | - Jing Gong
- Ningbo Sci-Tech Information and Development Strategy Institute, 999 Yangfan Road, Hi-tech Zone, Ningbo315100, Zhejiang Province, P. R. China
| | - Ya-Jun Cheng
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo315201, Zhejiang Province, P. R. China
| | - Jie Gao
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo315201, Zhejiang Province, P. R. China
| | - Yonggao Xia
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo315201, Zhejiang Province, P. R. China
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