Cross-Linked Poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-co-HFP) Gel Polymer Electrolyte for Flexible Li-Ion Battery Integrated with Organic Light Emitting Diode (OLED)

Ilhwan Kim; Bong Sung Kim; Seunghoon Nam; Hoo-Jeong Lee; Ho Kyoon Chung; Sung Min Cho; Thi Hoai Thuong Luu; Seungmin Hyun; Chiwon Kang

doi:10.3390/ma11040543

Cross-Linked Poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-co-HFP) Gel Polymer Electrolyte for Flexible Li-Ion Battery Integrated with Organic Light Emitting Diode (OLED)

Materials (Basel). 2018 Apr 2;11(4):543. doi: 10.3390/ma11040543.

Authors

Ilhwan Kim^{1

2}, Bong Sung Kim³, Seunghoon Nam⁴, Hoo-Jeong Lee⁵, Ho Kyoon Chung⁶, Sung Min Cho⁷, Thi Hoai Thuong Luu^{8

9}, Seungmin Hyun¹⁰, Chiwon Kang¹¹

Affiliations

¹ School of Advanced Materials Science and Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea. hwan20@skku.edu.
² Department of Applied Nano Mechanics, Korea Institute of Machinery and Materials (KIMM), Daejeon 305-343, Korea. hwan20@skku.edu.
³ SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU), Suwon 16419, Korea. kbsgod2012@gmail.com.
⁴ Department of Applied Nano Mechanics, Korea Institute of Machinery and Materials (KIMM), Daejeon 305-343, Korea. kwek14@kimm.re.kr.
⁵ School of Advanced Materials Science and Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea. hlee@skku.edu.
⁶ SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU), Suwon 16419, Korea. hokchung@skku.edu.
⁷ School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea. sungmcho@skku.edu.
⁸ Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon 16419, Korea. hoaithuongluu@gmail.com.
⁹ Department of Energy Science, Sungkyunkwan University (SKKU), Suwon 16419, Korea. hoaithuongluu@gmail.com.
¹⁰ Department of Applied Nano Mechanics, Korea Institute of Machinery and Materials (KIMM), Daejeon 305-343, Korea. hyun@kimm.re.kr.
¹¹ School of Advanced Materials Science and Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea. chiwonkang@skku.edu.

Abstract

Here, we fabricate poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-co-HFP) by electrospinning for a gel polymer electrolyte (GPE) for use in flexible Li-ion batteries (LIBs). As a solvent, we use N-methyl-2-pyrrolidone (NMP), which helps produce the cross-linked morphology of PVDF-co-HFP separator, owing to its low volatility. The cross-linked PVDF-co-HFP separator shows an uptake rate higher than that of a commercialized polypropylene (PP) separator. Moreover, the PVDF-co-HFP separator shows an ionic conductivity of 2.3 × 10^-3 S/cm at room temperature, comparable with previously reported values. An LIB full-cell assembled with the PVDF-co-HFP-based GPE shows capacities higher than its counterpart with the commercialized PP separator, confirming that the cross-linked PVDF-co-HFP separator provides highly efficient ionic conducting pathways. In addition, we integrate a flexible LIB cell using the PVDF-co-HFP GPE with a flexible organic light emitting diode (OLED), demonstrating a fully flexible unit of LIB and OLED.

Keywords: N-methyl-2-pyrrolidone (NMP); cross-linked poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-co-HFP); electrospinning; flexible Li-ion batteries; gel polymer electrolyte (GPE); ionic conductivity; organic light emitting diode (OLED).