Abstract
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/LiFePO 4 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.
| Original language | English |
|---|---|
| Pages (from-to) | 110-118 |
| Number of pages | 9 |
| Journal | Polymer |
| Volume | 173 |
| DOIs | |
| Publication status | Published - 2019 May 31 |
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All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry
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Polymer electrolytes based on Poly(VdF-co-HFP)/ionic liquid/carbonate membranes for high-performance lithium-ion batteries. / Tseng, Yu Chao; Wu, You; Tsao, Chih Hao; Teng, Hsisheng; Hou, Sheng-Shu; Jan, Jeng-Shiung.
In: Polymer, Vol. 173, 31.05.2019, p. 110-118.Research output: Contribution to journal › Article
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
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/LiFePO 4 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/LiFePO 4 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
VL - 173
SP - 110
EP - 118
JO - Polymer
JF - Polymer
SN - 0032-3861
ER -