Composite polymer electrolyte incorporating WO3 nanofillers with enhanced performance for dendrite-free solid-state lithium battery |
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Affiliation: | 1. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731, PR China;2. Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, Zhejiang, 313001, PR China;3. Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, 842 15, Bratislava, Slovakia |
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Abstract: | All solid-state lithium batteries (ASS-LBs) with polymer-based solid electrolytes are a prospective contender for the next-generation batteries because of their high energy density, flexibility, and safety. Among all-polymer electrolytes, PEO-based solid polymer electrolytes received huge consideration as they can dissolve various Li salts. However, the development of an ideal PEO-based solid polymer electrolyte is hindered by its insufficient tensile strength and lower ionic conductivity due to its semi-crystalline and soft chain structure. In order to lower the crystallization and improve the performance of PEO-based solid polymer electrolyte, tungsten trioxide (WO3) nanofillers were introduced into PEO matrix. Herein, a PEO20/LiTFSI/x-WO3 (PELI-xW) (x = 0%, 2.5%, 5%, 10%) solid composite polymer electrolyte was prepared by the tape casting method. The solid composite polymer electrolyte containing 5 wt% WO3 nanofillers achieved the highest ionic conductivity of 7.4 × 10-4 S cm-1 at 60 °C. It also confirms a higher Li-ion transference number of 0.42, good electrochemical stability of 4.3V, and higher tensile strength than a PEO/LiTFSI (PELI-0W) fillers-free electrolyte. Meanwhile, the LiFePO4│PELI-xW│Li ASS-LBs demonstrated high performance and cyclability. Based on these findings, it can be considered a feasible strategy for the construction of efficient and flexible PEO-based solid polymer electrolytes for next-generation solid-state batteries. |
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Keywords: | Solid-state lithium ions battery Polymer electrolyte Tungsten trioxide nanofillers Ionic conductivity Lithium-ion transference number |
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