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Promoted Li+ conduction in PEO-based all-solid-state electrolyte by hydroxyl-modified glass fiber fillers

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Abstract

In the polyoxyethylene (PEO)-based solid-state electrolytes, the low ionic conductivity of lithium ions limits its application in solid-state lithium batteries, so optimizing the conduction path of lithium ions is beneficial to improve the ionic conductivity. In this work, we report the use of hydrothermal carbon nano-sphere (HCS) modified glass fibers (GF) as a functional filler (GF@HCS) to improve the ionic conductivity of PEO composite solid-state electrolytes. The oxygen atoms in the hydroxyl groups on the surface of HCS can be complexed with Li ions as its transport sites, which means that it can promote the long-distance transport of Li ions along the glass fiber surface. With addition of 2 wt% GF@HCS fillers, the degree of crystallinity of PEO composite solid-state electrolyte is the smallest, and the ionic conductivity is significantly increased from 8.9 × 10–5 to 4.4 × 10–4  S·cm−1 at 60 °C. Moreover, the PEO composite solid-state electrolyte exhibits better lithium–metal interface stability in symmetric lithium batteries and superior rate performance in LiFePO4 solid-state batteries.

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摘要

在PEO基全固态电解质中, 由于它的锂离子离子电导率太低限制了其在固态锂电池中的应用, 因此优化锂离子的传导路径有利于提高它的离子电导率。在这项工作中, 我们报告了使用水热碳纳米球 (HCS) 改性玻璃纤维 (GF) 作为功能填料 (GF@HCS) 来提高PEO复合电解质的离子电导率。HCS表面羟基中的氧原子可以与锂离子络合作为它的传输位点, 即它可以促进锂离子沿玻璃纤维表面长距离传输。添加质量分数2 %的GF@HCS填料后, PEO复合固态电解质的结晶度最小而且它的离子电导率在 60 °C时从 8.9×10–5 S·cm–1提高到 4.4×10–4 S·cm–1。此外, 复合固态电解质在锂金属对称电池中表现出更好的界面稳定性, 在LiFePO4固态电池中表现出优异的倍率性能。

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 21875195, 22021001 and 52172184).

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Authors and Affiliations

  1. Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313001, China

    Xin Wang & Ai-Jun Zhou

  2. State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Centre of Chemistry for Energy Materials, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, Engineering Research Center of Electrochemical Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China

    Xiu Shen & Jin-Bao Zhao

  3. College of Energy and School of Energy Research, Xiamen University, Xiamen, 361102, China

    Peng Zhang

  4. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Ai-Jun Zhou

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Wang, X., Shen, X., Zhang, P. et al. Promoted Li+ conduction in PEO-based all-solid-state electrolyte by hydroxyl-modified glass fiber fillers. Rare Met. 42, 875–884 (2023). https://doi.org/10.1007/s12598-022-02218-4

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