TY - JOUR
T1 - Organosulfide-Based Deep Eutectic Electrolyte for Lithium Batteries
AU - Song, Jiahan
AU - Si, Yubing
AU - Guo, Wei
AU - Wang, Donghai
AU - Fu, Yongzhu
N1 - Publisher Copyright:
© 2021 Wiley-VCH GmbH
PY - 2021/4/26
Y1 - 2021/4/26
N2 - Deep eutectic electrolytes (DEEs) are a new class of electrolytes with unique properties. However, the intermolecular interactions of DEEs are mostly dominated by Li⋅⋅⋅O interactions, limiting the diversity of chemical space and material constituents. Herein, we report a new class of DEEs induced by Li⋅⋅⋅N interactions between 2,2′-dipyridyl disulfide (DpyDS) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). The strong ion-dipole interaction triggers the deep eutectic phenomenon, thus liberating the Li+ from LiTFSI and endowing the DEEs with promising ionic conductivity. These DEEs show admirable intrinsic safety, which cannot be ignited by flame. The DEE at the molar ratio of DpyDS:LiTFSI=4:1 (abbreviated as DEE-4:1) is electrochemically stable between 2.1 and 4.0 V vs. Li/Li+, and exhibits an ionic conductivity of 1.5×10−4 S cm−1 at 50 °C. The Li/LiFePO4 half cell with DEE-4:1 can provide a reversible capacity of 130 mAh g−1 and Coulombic efficiency above 98 % at 50 °C.
AB - Deep eutectic electrolytes (DEEs) are a new class of electrolytes with unique properties. However, the intermolecular interactions of DEEs are mostly dominated by Li⋅⋅⋅O interactions, limiting the diversity of chemical space and material constituents. Herein, we report a new class of DEEs induced by Li⋅⋅⋅N interactions between 2,2′-dipyridyl disulfide (DpyDS) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). The strong ion-dipole interaction triggers the deep eutectic phenomenon, thus liberating the Li+ from LiTFSI and endowing the DEEs with promising ionic conductivity. These DEEs show admirable intrinsic safety, which cannot be ignited by flame. The DEE at the molar ratio of DpyDS:LiTFSI=4:1 (abbreviated as DEE-4:1) is electrochemically stable between 2.1 and 4.0 V vs. Li/Li+, and exhibits an ionic conductivity of 1.5×10−4 S cm−1 at 50 °C. The Li/LiFePO4 half cell with DEE-4:1 can provide a reversible capacity of 130 mAh g−1 and Coulombic efficiency above 98 % at 50 °C.
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U2 - 10.1002/anie.202016875
DO - 10.1002/anie.202016875
M3 - Article
C2 - 33651453
AN - SCOPUS:85102878135
SN - 1433-7851
VL - 60
SP - 9881
EP - 9885
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 18
ER -