Issue 7, 2023

Salicylic acid treated Li7La3Zr2O12 achieves dual functions for a PEO-based solid polymer electrolyte in lithium metal batteries

Abstract

The Li7La3Zr2O12 (LLZO) electrolyte is typically introduced as an inorganic filler into poly(ethylene oxide) (PEO) to enhance the performance of batteries. However, LLZO particles inevitably come into contact with air and produce a Li2CO3 layer. The low ionic conductivity of Li2CO3 is not conducive to the conduction of Li+. Herein, LLZO particles were treated with salicylic acid (SA) to achieve dual functions. First, SA is used to effectively remove the Li2CO3 layer of the LLZO particles, which improves Li+ mobility at the interface of LLZO and the PEO matrix. Furthermore, SA treatment favors the uniform dispersion of LLZO and the positively charged SA-treated LLZO facilitates the immobilization of anions in LiTFSI, both of which promote the fast transport of Li+ in the PEO matrix. Therefore, the modified composite electrolyte exhibits an improved ionic transference number (0.63) and ionic conductivity (1.21 × 10−4 S cm−1 at 30 °C). The Li/Li symmetric battery can operate over 1300 h. Furthermore, the Li/LiFePO4 battery exhibits an impressive discharge capacity of 142.8 mA h g−1 after 150 cycles at 0.2C. These results indicate that SA treatment is a useful method for enhancing the electrochemical properties of the LLZO/PEO solid electrolyte.

Graphical abstract: Salicylic acid treated Li7La3Zr2O12 achieves dual functions for a PEO-based solid polymer electrolyte in lithium metal batteries

Supplementary files

Article information

Article type
Paper
Submitted
28 Des 2022
Accepted
20 Feb 2023
First published
03 Mac 2023

Sustainable Energy Fuels, 2023,7, 1645-1655

Salicylic acid treated Li7La3Zr2O12 achieves dual functions for a PEO-based solid polymer electrolyte in lithium metal batteries

W. He, H. Ding, C. Li, X. Chen and W. Yang, Sustainable Energy Fuels, 2023, 7, 1645 DOI: 10.1039/D2SE01782B

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