A new solvent mixture for use of LiTDI as electrolyte salt in Li-ion batteries - Physico-chimie des Matériaux et des Electrolytes pour l'Energie Laboratoire - - EA 6299 Accéder directement au contenu
Article Dans Une Revue Electrochimica Acta Année : 2019

A new solvent mixture for use of LiTDI as electrolyte salt in Li-ion batteries

Résumé

A new thermally stable ternary mixture composed of ethylene carbonate, γ-butyrolactone and methyl propionate (1: 1: 1 by weight), named EGM, is proposed for use as an electrolyte with the new salt LiTDI at a concentration of 1 mol L −1 . The EGM mixture has many advantages over the classical binary mixture EC/DMC (1:1 by weight) when LiTDI is used as single salt: (i) it remains liquid from −60 °C to 130 °C, (ii) it exhibits a higher conductivity (8.5 mS cm −1 vs. 6.8 mS cm −1 at 25 °C), (iii) a lower viscosity (2.4 mPa s vs. 2.8 mPa s at 25 °C) and, (iv) allows a better dissociation of LiTDI (37% vs. 31%). Cycling tests were performed using graphite/Li and LiNi 1/3 Mn 1/3 Co 1/3 O 2 (NMC)/Li half-cells as well as graphite/NMC full cells. It was shown that this electrolyte provides fair capacity retention for both the graphite and the NMC electrode at high C rates: up to 10C for graphite/Li half-cells and up to 6C for NMC/Li half-cells. The graphite//LiTDI-EGM//NMC full cell was able to sustain more than 800 cycles with a capacity retention of 70%, which is more than what was obtained in the same conditions with a graphite//LiPF 6 -EC/DMC//NMC cell (560 cycles). The impact on the discharge capacities of high (60 °C) and low (−20 °C) applied temperatures is also discussed herein.
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Dates et versions

hal-02099409 , version 1 (22-10-2021)

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Paternité - Pas d'utilisation commerciale

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Christopher Berhaut, Rémi Dedryvère, Laure Timperman, Grégory Schmidt, Daniel Lemordant, et al.. A new solvent mixture for use of LiTDI as electrolyte salt in Li-ion batteries. Electrochimica Acta, 2019, 305, pp.534-546. ⟨10.1016/j.electacta.2019.02.097⟩. ⟨hal-02099409⟩
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