Abstract
Solid polymer electrolyte (SPE) is a potential material for the next-generation safe battery system. However, the inability of SPEs to maintain mechanical strength and ionic conductivity is a bottleneck in further research. Here, a poly(ether-thioether) electrolyte with a thiol-ene crosslinked network was prepared by in situ click polymerization and supported on an electro-spun polyimide (PI) mat to provide an ultrathin membrane (19 µm in thickness). Combining a thiol-ene crosslinked network and the reinforcement of the electro-spun PI mat, this SPE membrane obtains high storage modulus (135 MPa), high ionic conductivity (2.24 × 10−4 S cm−1), and wide electrochemical window (up to 4.0 V) at 60°C. In addition, the Li-Li symmetrical cell based on the as-prepared electrolyte demonstrates stable cycling performance during Li plating/stripping, lasting more than 800 h at 0.1 mA cm−2. Such LiFePO4/Li cells with an ultrathin thiol-ene network SPE membrane achieve over 250-cycle stability at 0.5 C and 60°C. This work develops a new ultrathin polymer electrolyte for stable solid-state and high-performance lithium metal batteries.
摘要
固态聚合物电解质(SPE)是下一代安全电池系统的潜在材料, 但 SPE不能同时保持较高的机械强度和离子传导率, 使下一步研究进入瓶 颈. 在此, 我们通过原位点击反应在静电纺丝聚酰亚胺(PI)膜上制备了 一种具有交联结构的聚醚硫醚电解质, 厚度仅为19 μm. 由于烯-巯网络 的交联结构和静电纺丝PI膜的增强作用, 该SPE膜在60°C下具有 135 MPa的储能模量, 2.24 × 10−4 S cm−1的离子传导率和4.0 V的电化学 稳定窗口, 并且锂-锂对称电池在0.1 mA cm−2下循环超过800 h, 展现出 了优异的循环稳定性. 用该超薄聚合物电解质膜组装的LiFePO4/Li电池 在60°C, 0.5 C下能够循环超过250圈. 这项工作开发了一种用于固态高 性能锂金属电池的新型聚合物电解质.
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Acknowledgements
This work was supported by the National Key Research and Development Program (2019YFA0705701), the National Natural Science Foundation of China (22179149, 22075329, 22008267, 51573215 and 21978332), the Basic and Applied Basic Research Foundation of Guangdong province (2021A0505030022, 2019A1515010803 and 2020A1515011445), and Guangzhou Scientific and Technological Planning Project (201804020025 and 201904010271).
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Li Z and Wang T carried out the project and wrote the original draft; Zhong L and Meng Y refined the draft and supervised the project; Xiao M, Han D, Wang S, Zhang S, and Huang S contributed to the data analysis and discussion. All authors contributed to the general discussion.
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Zhifeng Li is currently a ME candidate at the School of Material Science and Engineering, Sun Yat-sen University. He received his BE degree from Sun Yat-sen University in 2020. His research interest is solid polymer electrolytes and their applications in LIBs.
Tianyi Wang received his BE degree from the School of Materials Science and Engineering, Sun Yat-sen University in 2016. He is studying for a doctorate degree under the supervision of Prof. Yuezhong Meng at Sun Yat-sen University.
Lei Zhong received her PhD degree from the School of Material Science and Engineering, Sun Yat-sen University in 2018. She became a postdoctoral and associate research fellow at the School of Materials Science and Engineering, Sun Yat-sen university in 2018 and 2020, respectively. Her research interest includes solid electrolytes and their applications in energy devices, such as lithium sulfur batteries.
Yuezhong Meng received his BSc, MSc, and PhD degrees from Dalian University of Technology. He worked at the City University of Hong Kong, McGill University, Nanyang Technological University and the National University of Singapore for more than 8 years. He became a “Hundred Talents” member of Chinese Academy of Sciences in 1998. Now he is a Pearl-River professor at Sun Yat-sen University and the director of the Key Laboratory of Low-carbon Chemistry and Energy Conservation of Guangdong Province.
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The authors declare that they have no conflict of interest.
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Li, Z., Wang, T., Zhong, L. et al. Ultrathin thiol-ene crosslinked polymeric electrolyte for solid-state and high-performance lithium metal batteries. Sci. China Mater. 66, 1332–1340 (2023). https://doi.org/10.1007/s40843-022-2259-3
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DOI: https://doi.org/10.1007/s40843-022-2259-3