Issue 3, 2023

PEO composite solid polymer electrolytes with the synergistic effect of cryogenic engineering and trace BP nanosheets for nearly room temperature and 4 V class all-solid-state lithium batteries

Abstract

Poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) are considered promising candidates for next-generation high-safety lithium batteries, however, long-termly limited by their inferior ionic conductivity, low lithium ionic transference number, and insufficient electrochemical stability, especially at room temperature. Herein, we report a novel PEO-based SPE with the synergistic effect of black phosphorus (BP) nanosheets and a cryogenic method, which combined the advantages of the fast Li+ pathways of BP nanosheets and low PEO crystallization induced by the cryogenic process. The addition of BP nanosheets could promote the dissociation of LiTFSI and provide long-range Li+-migration pathways in the BP/PEO interface. The cryogenic strategy could reduce the sizes of the PEO crystals apart from the BP/PEO interface and further improve the ionic conductivity and Li+-transference number of the composite SPEs. As a result, the cryogenic PEO-based SPEs with only 0.05% wt BP nanosheets (C-BP SPEs) displayed an excellent ionic conductivity of 3.38 × 10−5 S cm−1, which was 15.7 times higher than that of pristine PEO SPEs, and a wide electrochemical stability at 30 °C. NCM622/SPEs/Li cells with C-BP SPEs could provide a high discharge capacity of 150.2 mA h g−1 at 0.1C as well as satisfactory cycling performance with a capacity retention of 88.1% after 500 cycles at 0.5C at 30 °C. Importantly, pouch cells were assembled to demonstrate the suitability of the C-BP SPEs for practical application and displayed good electrochemical performance.

Graphical abstract: PEO composite solid polymer electrolytes with the synergistic effect of cryogenic engineering and trace BP nanosheets for nearly room temperature and 4 V class all-solid-state lithium batteries

Supplementary files

Article information

Article type
Paper
Submitted
02 11 2022
Accepted
27 12 2022
First published
28 12 2022

Sustainable Energy Fuels, 2023,7, 652-660

PEO composite solid polymer electrolytes with the synergistic effect of cryogenic engineering and trace BP nanosheets for nearly room temperature and 4 V class all-solid-state lithium batteries

J. Tan, Z. Wang, J. Cui, Y. Chen, Z. Jia, M. Yang, N. Gemingjiang, Z. Xiao, X. Wang, W. Gao, W. Tian, C. Zhang, W. Tang and Y. Wu, Sustainable Energy Fuels, 2023, 7, 652 DOI: 10.1039/D2SE01524B

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