Kim Ilhwan, Kim Bong Sung, Nam Seunghoon, Lee Hoo-Jeong, Chung Ho Kyoon, Cho Sung Min, Luu Thi Hoai Thuong, Hyun Seungmin, Kang Chiwon
School of Advanced Materials Science and Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea.
Department of Applied Nano Mechanics, Korea Institute of Machinery and Materials (KIMM), Daejeon 305-343, Korea.
Materials (Basel). 2018 Apr 2;11(4):543. doi: 10.3390/ma11040543.
Here, we fabricate poly(vinylidene fluoride--hexafluoropropene) (PVDF--HFP) by electrospinning for a gel polymer electrolyte (GPE) for use in flexible Li-ion batteries (LIBs). As a solvent, we use -methyl-2-pyrrolidone (NMP), which helps produce the cross-linked morphology of PVDF--HFP separator, owing to its low volatility. The cross-linked PVDF--HFP separator shows an uptake rate higher than that of a commercialized polypropylene (PP) separator. Moreover, the PVDF--HFP separator shows an ionic conductivity of 2.3 × 10 S/cm at room temperature, comparable with previously reported values. An LIB full-cell assembled with the PVDF--HFP-based GPE shows capacities higher than its counterpart with the commercialized PP separator, confirming that the cross-linked PVDF--HFP separator provides highly efficient ionic conducting pathways. In addition, we integrate a flexible LIB cell using the PVDF--HFP GPE with a flexible organic light emitting diode (OLED), demonstrating a fully flexible unit of LIB and OLED.
在此，我们通过静电纺丝制备聚（偏二氟乙烯 - 六氟丙烯）（PVDF - HFP），用于柔性锂离子电池（LIB）的凝胶聚合物电解质（GPE）。作为溶剂，我们使用N - 甲基 - 2 - 吡咯烷酮（NMP），由于其低挥发性，有助于形成PVDF - HFP隔膜的交联形态。交联的PVDF - HFP隔膜显示出比商业化聚丙烯（PP）隔膜更高的吸收率。此外，PVDF - HFP隔膜在室温下的离子电导率为2.3×10⁻³ S/cm，与先前报道的值相当。用基于PVDF - HFP的GPE组装的LIB全电池显示出比使用商业化PP隔膜的对应电池更高的容量，证实交联的PVDF - HFP隔膜提供了高效的离子传导途径。此外，我们将使用PVDF - HFP GPE的柔性LIB电池与柔性有机发光二极管（OLED）集成在一起，展示了一个完全柔性的LIB和OLED单元。
