Issue 28, 2025

Study on the regulation mechanism of a coral-like Li7La3Zr2O12 inorganic filler on the properties of poly(ethylene oxide)-based composite solid electrolytes

Abstract

Poly(ethylene oxide) (PEO)-based composite solid electrolytes have attracted extensive attention due to their potential to simultaneously achieve high lithium-ion conductivity and good interfacial compatibility, along with their potential for roll-to-roll production. Herein, a coral-like Li7La3Zr2O12 (LLZO) inorganic filler was obtained by electrospinning and calcination. Compared with granular LLZO, coral-like LLZO has numerous branches, which are beneficial for rapid Li+ migration. The lithium-ion conductivity of the PLCL (PEO + LiTFSI + coral-like LLZO) composite solid electrolyte was 1.32 × 10−4 S cm−1 at 25 °C, which was about 15 times higher than that of PL (PEO + LiTFSI). The electrochemical window also increased from 4.0 to 4.8 V. Coral-like LLZO enhanced the movement of PEO segments by greatly reducing the crystallinity, increased the number of free Li+ by increasing the dissociation degree of LiTFSI, and improved the effective migration of Li+ by increasing the number of rapid Li+-migration channels. Results from multi-physical field simulations and Raman spectroscopy showed that Li+ ions were mainly transmitted in the interior of LLZO, indicating that the coral-like LLZO provides rapid channels for Li+ migration. In addition, due to the large contact area between coral-like LLZO and PEO, Li+ migration channels also appeared at the PEO/LLZO interface.

Graphical abstract: Study on the regulation mechanism of a coral-like Li7La3Zr2O12 inorganic filler on the properties of poly(ethylene oxide)-based composite solid electrolytes

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Article information

Article type
Paper
Submitted
25 Feb 2025
Accepted
06 Jun 2025
First published
09 Jun 2025

J. Mater. Chem. A, 2025,13, 22809-22821

Study on the regulation mechanism of a coral-like Li7La3Zr2O12 inorganic filler on the properties of poly(ethylene oxide)-based composite solid electrolytes

Y. Zhang, L. Zou, C. Wan, Z. Tang, Y. Xiao, X. Xiang and J. Deng, J. Mater. Chem. A, 2025, 13, 22809 DOI: 10.1039/D5TA01563D

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