TY - JOUR
T1 - Polymer electrolytes based on Poly(VdF-co-HFP)/ionic liquid/carbonate membranes for high-performance lithium-ion batteries
AU - Tseng, Yu Chao
AU - Wu, You
AU - Tsao, Chih Hao
AU - Teng, Hsisheng
AU - Hou, Sheng Shu
AU - Jan, Jeng Shiung
N1 - Funding Information:
The authors acknowledge the financial support from the Ministry of Science and Technology, Taiwan (MOST 105-3113-E-006-015-CC2 and 106-3113-E-006-009 ) and Hierarchical Green-Energy Materials Research Center, National Cheng Kung University, Tainan , Taiwan.
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/5/31
Y1 - 2019/5/31
N2 - In this study, we prepared the electrolytes by mixing the poly(vinylidene fluoride-co-hexafluoropropylene) (poly(VdF-co-HFP)) with 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM-TFSI), ethylene carbonate (EC) and lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) in several weight ratios. The as-prepared electrolytes reveal micropores with various morphologies depending on the added EC content. They also exhibit glass transition temperatures lower than 0 °C, decomposition temperatures higher than 200 °C and good limited oxygen index to about 34 wt%. Moreover, the addition of EC facilitates the improvement of ion transport without compromising the electrochemical stability, consequently resulting in high ionic conductivity around 2.3 × 10−3 S/cm at room temperature and a wide electrochemical window. In particular, the Li/LiFePO4 cells assembled with the electrolytes deliver remarkable discharge capacities of 143 mAh g−1, 120 mAh g−1 and 15 mAh g−1 at 0.2 C, 1 C and 5 C rates, respectively, with excellent capacity retention over 300 cycles at a rate of 0.2 C, as well as great interfacial stability after long-term cycling of charge-discharge. This study, in summary, provides a simple approach to prepare a quaternary electrolyte system and the findings indicate that the polymer electrolytes can be applied for high-performance LIBs.
AB - In this study, we prepared the electrolytes by mixing the poly(vinylidene fluoride-co-hexafluoropropylene) (poly(VdF-co-HFP)) with 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM-TFSI), ethylene carbonate (EC) and lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) in several weight ratios. The as-prepared electrolytes reveal micropores with various morphologies depending on the added EC content. They also exhibit glass transition temperatures lower than 0 °C, decomposition temperatures higher than 200 °C and good limited oxygen index to about 34 wt%. Moreover, the addition of EC facilitates the improvement of ion transport without compromising the electrochemical stability, consequently resulting in high ionic conductivity around 2.3 × 10−3 S/cm at room temperature and a wide electrochemical window. In particular, the Li/LiFePO4 cells assembled with the electrolytes deliver remarkable discharge capacities of 143 mAh g−1, 120 mAh g−1 and 15 mAh g−1 at 0.2 C, 1 C and 5 C rates, respectively, with excellent capacity retention over 300 cycles at a rate of 0.2 C, as well as great interfacial stability after long-term cycling of charge-discharge. This study, in summary, provides a simple approach to prepare a quaternary electrolyte system and the findings indicate that the polymer electrolytes can be applied for high-performance LIBs.
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U2 - 10.1016/j.polymer.2019.04.008
DO - 10.1016/j.polymer.2019.04.008
M3 - Article
AN - SCOPUS:85064569751
VL - 173
SP - 110
EP - 118
JO - Polymer
JF - Polymer
SN - 0032-3861
ER -
