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ACS Appl Mater Interfaces. 2018 Aug 1;10(30):25384-25392. doi: 10.1021/acsami.8b06800. Epub 2018 Jul 20.

Robust Succinonitrile-Based Gel Polymer Electrolyte for Lithium-Ion Batteries Withstanding Mechanical Folding and High Temperature.

Lv P1,2, Li Y2, Wu Y2, Liu G2, Liu H2, Li S2, Tang C2, Mei J2, Li Y1.

Author information

1
College of Material Science and Engineering , Southwest Petroleum University , Chengdu 610500 , China.
2
Chengdu Green Energy and Green Manufacturing Technology R&D Center , China Academy of Engineering Physics , Chengdu 610200 , China.

Abstract

Fabrication of a gel polymer electrolyte containing succinonitrile (GPE-SN) with high mechanical strength is quite challenging because the SN electrolyte always suppresses the formation of polymer networks during in situ polymerization. In this work, a mechanically robust GPE-SN was successfully prepared by using a solution immersion method. During fabrication, the paste-like SN electrolyte was transformed into a liquid SN electrolyte with low viscosity by heating at 50 °C and then infiltrated into the UV-cured highly cross-linked polyurethane acrylate (PUA) skeleton. The resulted GPE-SN film exhibits superior tensile strength (6.5 MPa) compared to the one (0.5 MPa) prepared by in situ polymerization (GPE-SN-IN). The high mechanical strength of the GPE-SN-IM film enables the LiCoO2/Li4Ti5O12 film battery to withstand 100-cycle folding without electrolyte damage and capacity loss. Besides, the GPE-SN presents a high ionic conductivity (1.63 × 10-3 S·cm-1 at 25 °C), which is comparable to GPE with a commercial liquid electrolyte (GPE-LE). Because of good thermal stability of the GPE-SN, the LiCoO2/Li cell with this electrolyte shows better charge-discharge cycling stability than that with GPE-LE at high temperature (55 °C). Thus, the GPE-SN prepared by our method could be a promising polymer electrolyte offering better safety and reliability for lithium-ion batteries.

KEYWORDS:

gel polymer electrolyte; lithium-ion battery; mechanical strength; succinonitrile; thermal stability

PMID:
29984993
DOI:
10.1021/acsami.8b06800

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