Supramolecular Network Structured Gel Polymer Electrolyte with High Ionic Conductivity for Lithium Metal Batteries

Fei Chen, Changxiang Guo, Honghao Zhou, Muhammad Wakil Shahzad, Terence Liu, Sokolskyi Oleksandr, Jining Sun, Sheng Dai, Ben Bin Xu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Polymer-based solid electrolytes (PSEs) offer great promises in developing lithium metal batteries due to their attractive features such as safety, lightweight, low cost and high processability. However, PSE-based lithium battery usually requires a relatively high temperature (60 oC or above) to complete charge and discharge due to the poor ionic conductivity of PSEs. Herein, we design and develop a Gel polymer electrolytes (GPEs) film with a supramolecular network structure through a facile one-step photopolymerization. The crosslinked structure and quadruple hydrogen bonding fulfil the GPEs with high thermal stability and good mechanical property with a maximum tensile strain of 48 %. The obtained GPEs possess a high ionic conductivity of 3.8×10-3 S cm-1 at 25 oC and a decomposition voltage ≥ 4.6 V (vs. Li/Li+). The cells assembled with LiFePO4 (LFP) cathode and Li anode, present an initial discharge specific capacity of 155.6 mAh g-1 and a good cycling efficiency with a capacity retention rate of 81.1% after 100 charges/discharge cycles at 0.1C at ambient temperature. This work encompasses a new route to develop high performance PSEs that can be operated at room temperature for future lithium metal batteries.
Original languageEnglish
JournalSmall
DOIs
Publication statusPublished - 14 Dec 2021

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