Gelled electrolyte containing phosphonium ionic liquids for lithium-ion batteries - Archive ouverte HAL
Article Dans Une Revue Nanomaterials Année : 2018

Gelled electrolyte containing phosphonium ionic liquids for lithium-ion batteries

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In this work, new gelled electrolytes were prepared based on a mixture containing phosphonium ionic liquid (IL) composed of trihexyl(tetradecyl)phosphonium cation combined with bis(trifluoromethane)sulfonimide [TFSI] counter anions and lithium salt, confined in a host network made from an epoxy prepolymer and amine hardener. We have demonstrated that the addition of electrolyte plays a key role on the kinetics of polymerization but also on the final properties of epoxy networks, especially thermal, thermo-mechanical, transport, and electrochemical properties. Thus, polymer electrolytes with excellent thermal stability (>300 °C) combined with good thermo-mechanical properties have been prepared. In addition, an ionic conductivity of 0.13 Ms·cm$^{−1}$ at 100 °C was reached. Its electrochemical stability was 3.95 V vs. Li$^0$/Li$^+$ and the assembled cell consisting in Li|LiFePO$_4$ exhibited stable cycle properties even after 30 cycles. These results highlight a promising gelled electrolyte for future lithium ion batteries.
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hal-02010487 , version 1 (28-08-2024)

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Mélody Leclère, Laurent Bernard, Sébastien Livi, Michel Bardet, Armel Guillermo, et al.. Gelled electrolyte containing phosphonium ionic liquids for lithium-ion batteries. Nanomaterials, 2018, 8 (6), pp.435. ⟨10.3390/nano8060435⟩. ⟨hal-02010487⟩
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