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Journal Article
Enhanced Separator Properties by Thermal Curing of Poly(Ethylene Glycol)Diacrylate-Based Gel Polymer Electrolytes for Lithium-Ion Batteries
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- Authors
- Kwang Man Kima, Beta Zenia Poliquit, Young-Gi Lee, Jeongha Won, Jang Myoun Ko, Won Il Cho
- Issue Date
- 2014-02
- Citation
- Electrochimica Acta, v.120, pp.159-166
- ISSN
- 0013-4686
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- Porous polyethylene (PE) or nonwoven poly(vinylidene fluoride) (PVdF) separator-supported gel polymer electrolytes are realized by thermal polymerization of a precursor solution consisting of poly(ethylene glycol)diacrylate (PEGDA) and an electrolyte solution (1 M LiPF6 in an equal-volume mixture of ethylene carbonate and dimethyl carbonate). The polymerization conditions are optimized to include a PEGDA content of 3 wt.% in the precursor solution and subsequent heat treatment at 80 C for 10 min. Even though the gelled PEGDA electrolyte has a lower ionic conductivity than the electrolyte solution, a LixCoO2/graphite full-cell that has a gel electrolyte with optimized PEGDA content on the PVdF separator achieves a battery performance superior to the one with PE. The best battery performances achieved are a high discharge capacity (116 mAh g-1), a good high-rate capability (95 mAh g-1 at 5.0 C-rate), and a high capacity retention ratio (90%) after the 100th cycle. This enhancement is due to the incorporation of a polar electrolyte solution that is entrapped by the polar PEGDA matrix within the nonwoven PVdF separator, which is a more suitable host that is able to well absorb and preserve the gel electrolyte. © 2013 Elsevier Ltd.
- KSP Keywords
- Dimethyl carbonate(DMC), Full cell, Gel electrolyte, Gel polymer electrolytes, Heat Treatment, High capacity retention, Ion batteries, Lithium-ion batteries(LIBs), PVdF separator, Poly(ethylene glycol) diacrylate, Polyethylene (pe)