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Affiliation of Author(s):[1]Univ Elect Sci & Technol China, Sch Mat & Energy, Chengdu 611731, Peoples R China;[2]Univ Elect Sci & Technol China, Yangtze Delta Reg Inst Huzhou, Huzhou 313001, Zhejiang, Peoples R China;[3]Comenius Univ, Fac Nat Sci, Dept Inorgan Chem, Bratislava 84215, Slovakia

Journal:CERAMICS INTERNATIONAL

Key Words:Solid-state lithium ions battery; Polymer electrolyte; Tungsten trioxide nanofillers; Ionic conductivity; Lithium-ion transference number

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 x 10-4 S cm-1 at 60 degrees 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.

Document Type:Article

Volume:49

Issue:3

Page Number:4473-4481

ISSN No.:0272-8842

Translation or Not:no

Release time:2025-05-23