상세정보
학술지
Enhanced Separator Properties by Thermal Curing of Poly(Ethylene Glycol)Diacrylate-Based Gel Polymer Electrolytes for Lithium-Ion Batteries
- 발행일
- 201402
- 출처
- Electrochimica Acta, v.120, pp.159-166
- ISSN
- 0013-4686
- 출판사
- Elsevier
- 초록
- 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 제안 키워드
- Dimethyl carbonate(DMC), Electrolyte solution, Full cell, Gel polymer electrolyte, High capacity retention, High discharge capacity, Ion batteries, PVdF separator, Poly(ethylene glycol) diacrylate, Polyethylene (pe), Polymerization conditions