Polymer electrolytes based on Poly(VdF-co-HFP)/ionic liquid/carbonate membranes for high-performance lithium-ion batteries

Yu Chao Tseng, You Wu, Chih Hao Tsao, Hsisheng Teng, Sheng-Shu Hou, Jeng-Shiung Jan

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)110-118
Number of pages9
JournalPolymer
Volume173
DOIs
Publication statusPublished - 2019 May 31

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Ionic Liquids
Carbonates
Ionic liquids
Electrolytes
Polymers
Membranes
Ethylene
Ionic conductivity
Lithium
Lithium-ion batteries
polyvinylidene fluoride
Ions
Oxygen
Decomposition
Temperature
ethylene carbonate

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

@article{a2388e095a444a2a9abaef03e7f3ec6b,
title = "Polymer electrolytes based on Poly(VdF-co-HFP)/ionic liquid/carbonate membranes for high-performance lithium-ion batteries",
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.",
author = "Tseng, {Yu Chao} and You Wu and Tsao, {Chih Hao} and Hsisheng Teng and Sheng-Shu Hou and Jeng-Shiung Jan",
year = "2019",
month = "5",
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doi = "10.1016/j.polymer.2019.04.008",
language = "English",
volume = "173",
pages = "110--118",
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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 journalArticle

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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M3 - Article

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JO - Polymer

JF - Polymer

SN - 0032-3861

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