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

Chen, Fei, Guo, Changxiang, Zhou, Honghao, Shahzad, Muhammad Wakil, Liu, Xiaoteng, Oleksandr, Sokolskyi, Dai, Sheng and Xu, Bin (2022) Supramolecular Network Structured Gel Polymer Electrolyte with High Ionic Conductivity for Lithium Metal Batteries. Small. p. 2106352. ISSN 1613-6810 (In Press)

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Polymer-based solid electrolytes (PSEs) offer great promise in developing lithium metal batteries due to their attractive features such as safety, light weight, low cost, and high processability. However, a PSE-based lithium battery usually requires a relatively high temperature (60 °C or above) to complete charge and discharge due to the poor ionic conductivity of PSEs. Herein, a gel polymer electrolytes (GPEs) film with a supramolecular network structure through a facile one-step photopolymerization is designed and developed. 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 °C and a decomposition voltage ≥ 4.6 V (vs Li/Li+). The cells assembled with LiFePO4 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 0.1 C at ambient temperature. This work encompasses a route to develop high performance PSEs that can be operated at room temperature for future lithium metal batteries.

Item Type: Article
Additional Information: Funding information: This work was supported by the National Natural Science Foundation of China (No. 21803040), Young Talent Support Plan of Xi'an Jiaotong University and the Engineering and Physical Sciences Research Council (EPSRC) Grant Nos. EP/N007921 and EP/S032886.
Uncontrolled Keywords: supramolecular network, lithium metal batteries, ionic conductivity, high-voltage electrolyte, GPEs
Subjects: H300 Mechanical Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Elena Carlaw
Date Deposited: 15 Dec 2021 17:01
Last Modified: 24 Jan 2022 10:45

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