TY - JOUR
T1 - Mixing ionic liquids and ethylene carbonate as safe electrolytes for lithium-ion batteries
AU - Le, Linh T.M.
AU - Vo, Thanh D.
AU - Ngo, Khanh H.P.
AU - Okada, S.
AU - Alloin, F.
AU - Garg, A.
AU - Le, Phung M.L.
N1 - Funding Information:
This work was supported by Vietnam National University Ho Chi Minh (VNUHCM) under grant NV2018-18-01 and National Foundation for Science and Technology Development (NAFOSTED) through the research project 104.06-2016.37 .
Publisher Copyright:
© 2018
PY - 2018/12/1
Y1 - 2018/12/1
N2 - With aim to design safety and high electrochemical-stability electrolytes, mixtures ionic liquids (ILs) – ethylene carbonate have been prepared and investigated for lithium-ion cell using LiMn2O4 (LMO) and LiFePO4 (LFP) as cathode materials. The addition of 20 vol% ethylene carbonate (EC) could decrease significantly the viscosity as well as improve ionic conductivity and cycling performance of the electrolyte at room temperature. In the electrolyte containing 20 vol% EC, lithium-ion diffusion coefficient is still lower than commercial one based on conventional solvents. However, the stable charge - discharge behavior with N,N‑dimethyl‑N‑ethyl‑N‑propylammonium bis(trifluoromethanesulfonyl) imide (N1123TFSI) based mixtures was achieved up to 120 mAh·g−1 in the first cycle and remaining round 100 mAh·g−1 within 20 cycles without any noticeable capacity loss, and a little bit lower with respect to 1‑ethyl‑3‑methylimidazolium bis(trifluoromethanesulfonul)imide (EMITFSI) and N,N‑dimethyl‑N‑ethyl‑N‑butylammonium bis(trifluoromethanesulfonyl) imide (N1124TFSI). The results also showed that the solvent addition up to 25 vol% maintained homogenous solution and good electrochemical stability of the electrolytes.
AB - With aim to design safety and high electrochemical-stability electrolytes, mixtures ionic liquids (ILs) – ethylene carbonate have been prepared and investigated for lithium-ion cell using LiMn2O4 (LMO) and LiFePO4 (LFP) as cathode materials. The addition of 20 vol% ethylene carbonate (EC) could decrease significantly the viscosity as well as improve ionic conductivity and cycling performance of the electrolyte at room temperature. In the electrolyte containing 20 vol% EC, lithium-ion diffusion coefficient is still lower than commercial one based on conventional solvents. However, the stable charge - discharge behavior with N,N‑dimethyl‑N‑ethyl‑N‑propylammonium bis(trifluoromethanesulfonyl) imide (N1123TFSI) based mixtures was achieved up to 120 mAh·g−1 in the first cycle and remaining round 100 mAh·g−1 within 20 cycles without any noticeable capacity loss, and a little bit lower with respect to 1‑ethyl‑3‑methylimidazolium bis(trifluoromethanesulfonul)imide (EMITFSI) and N,N‑dimethyl‑N‑ethyl‑N‑butylammonium bis(trifluoromethanesulfonyl) imide (N1124TFSI). The results also showed that the solvent addition up to 25 vol% maintained homogenous solution and good electrochemical stability of the electrolytes.
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U2 - 10.1016/j.molliq.2018.09.068
DO - 10.1016/j.molliq.2018.09.068
M3 - Article
AN - SCOPUS:85053495566
VL - 271
SP - 769
EP - 777
JO - Journal of Molecular Liquids
JF - Journal of Molecular Liquids
SN - 0167-7322
ER -
