In this work, a structurable gel-polymer electrolyte (SGPE) with a controllable pore structure that is not destroyed after immersion in an electrolyte is produced via a simple nonsolvent induced phase separation (NIPS) method. This study investigates how the regulation of the nonsolvent content affects the evolving nanomorphology of the composite separators and overcomes the drawbacks of conventional separators, such as glass fiber (GF), which has been widely used in sodium ion batteries (SIBs), through the regulation of pore size and gel-polymer position. The interfacial resistance is reduced through selective positioning of a poly(vinylidene fluoride-co-hexa fluoropropylene) (PVdF-HFP) gel-polymer with the aid of NIPS, which in turn enhances the compatibility between the electrolyte and electrode. In addition, the highly porous morphology of the GF/SGPE obtained via NIPS allows for the absorption of more liquid electrolyte. Thus, a greatly improved cell performance of the SIBs is observed when a tailored SGPE is incorporated into the GF separator through charge/discharge testing compared with the performance observed with pristine GF and conventional GF coated with PVdF-HFP gel-polymer.
Bibliographical noteFunding Information:
This work was supported by the Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20152010103470). This work was partially supported by the KIST Institutional Program (Project No. 2E25630). This work was supported by the NRF of Korea Grant funded by the Ministry of Science, ICT & Future Planning (No. NRF-2015M2A2A6A01045277). We also acknowledge the support from National Research Foundation of Korea (NRF) grant funded by the Korea government (NRF-2016R1A2A1A05005216, NRF-2015M2A2A6A01045277). We thank Dr. Kan Zhang for his help in revising the manuscript.
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics