Interfacial self-healing polymer electrolytes for long-cycle solid-state lithium-sulfur batteries

Fei Pei, Lin Wu, Yi Zhang, Yaqi Liao, Qi Kang, Yan Han, Huangwei Zhang, Yue Shen, Henghui Xu (), Zhen Li () and Yunhui Huang ()
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Fei Pei: Huazhong University of Science and Technology
Lin Wu: Huazhong University of Science and Technology
Yi Zhang: Huazhong University of Science and Technology
Yaqi Liao: Huazhong University of Science and Technology
Qi Kang: Huazhong University of Science and Technology
Yan Han: Huazhong University of Science and Technology
Huangwei Zhang: Huazhong University of Science and Technology
Yue Shen: Huazhong University of Science and Technology
Henghui Xu: Huazhong University of Science and Technology
Zhen Li: Huazhong University of Science and Technology
Yunhui Huang: Huazhong University of Science and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Coupling high-capacity cathode and Li-anode with solid-state electrolyte has been demonstrated as an effective strategy for increasing the energy densities and safety of rechargeable batteries. However, the limited ion conductivity, the large interfacial resistance, and unconstrained Li-dendrite growth hinder the application of solid-state Li-metal batteries. Here, a poly(ether-urethane)-based solid-state polymer electrolyte with self-healing capability is designed to reduce the interfacial resistance and provides a high-performance solid-state Li-metal battery. With its dynamic covalent disulfide bonds and hydrogen bonds, the proposed solid-state polymer electrolyte exhibits excellent interfacial self-healing ability and maintains good interfacial contact. Full cells are assembled with the two integrated electrodes/electrolytes. As a result, the Li||Li symmetric cells exhibit stable long-term cycling for more than 6000 h, and the solid-state Li-S battery shows a prolonged cycling life of 700 cycles at 0.3 C. The use of ultrasound imaging technology shows that the interfacial contact of the integrated structure is much better than those of traditional laminated structure. This work provides an interesting interfacial dual-integrated strategy for designing high-performance solid-state Li-metal batteries.

Date: 2024
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DOI: 10.1038/s41467-023-43467-w

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