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Robust Succinonitrile-Based Gel Polymer Electrolyte for Lithium-Ion Batteries Withstanding Mechanical Folding and High Temperature
journal contribution
posted on 2018-07-09, 00:00 authored by Pengfei Lv, Yongsheng Li, Yuhan Wu, Guobiao Liu, Hao Liu, Shaomin Li, Changyu Tang, Jun Mei, Yuntao LiFabrication 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.
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Lithium-Ion Batteries Withstanding Mechanicalsolution immersion methodRobust Succinonitrile-Based Gel Polymer Electrolytepaste-like SN electrolyteSN electrolytecross-linked polyurethane acrylateGPE-SN film exhibitspolymer electrolyte offeringGPE-SN-INGPE-SN-IMHigh Temperature FabricationPUAGPE-LEgel polymer electrolytestrength
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