Issue 18, 2023

In situ fabrication of fluorine-modified acrylate-based gel polymer electrolytes for lithium-metal batteries

Abstract

Gel polymer electrolytes (GPEs) have attracted substantial interest due to their high lithium-ion conductivities and safety. However, the narrow electrochemical stability windows and poor mechanical properties of conventional GPEs limit their application in batteries targeting high energy densities. Herein, a fluorine-modified acrylate-based GPE is designed and prepared via in situ polymerization, which exhibits a wide electrochemical window, high Li+ transference number and ionic conductivity. The introduced fluorine-rich group can promote the uniform deposition of Li ions and inhibit the growth of Li dendrites, thus enabling stable cycling of Li symmetric cells for 2400 h at 0.1 mA cm−2. Meanwhile, a Li-metal cell with the NCM811 cathode and GPE exhibits promising long-term cycling stability (91% capacity retention after 260 cycles, 2C) and rate capability (e.g., 125 mA h g−1 at 10C), when cycled between 3.0 and 4.5 V at 25 °C. Moreover, this GPE is also successfully utilized in pouch cells, and 81% capacity is maintained after 150 cycles. This study demonstrates the potential of fluorination in promoting the performance of GPEs and can serve as a guideline for the future development of Li-metal batteries with high-nickel layered cathode materials.

Graphical abstract: In situ fabrication of fluorine-modified acrylate-based gel polymer electrolytes for lithium-metal batteries

Supplementary files

Article information

Article type
Research Article
Submitted
06 Apr 2023
Accepted
21 Jun 2023
First published
20 Jul 2023
This article is Open Access
Creative Commons BY-NC license

Mater. Chem. Front., 2023,7, 4152-4163

In situ fabrication of fluorine-modified acrylate-based gel polymer electrolytes for lithium-metal batteries

K. Yang, Z. Shen, J. Huang, J. Zhong, Y. Lin, J. Zhu, J. Chen, Y. Wang, T. Xie, J. Li and Z. Shi, Mater. Chem. Front., 2023, 7, 4152 DOI: 10.1039/D3QM00362K

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