Controlled pore evolution during phase inversion from the combinatorial non-solvent approach: application to battery separators. Issue 24 (1st June 2016)

• Record Type: Journal Article
• Authors: Heo, Jinwoo; Choi, Yunah; Chung, Kyung Yoon; Park, Jong Hyeok
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 24(2016)
• Page Start: 9496
• Page End: 9501
• Publication Date: 2016-06-01
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta02472f
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Phase inversion is a simple process to prepare porous thin films for lithium ion battery (LIB) separators. Abstract : Phase inversion is a simple process to prepare porous thin films for lithium ion battery (LIB) separators. However, controlling porous morphologies during phase inversions for efficient lithium ionic transportation is a critical issue for more optimized battery performances. Here, we report an LIB separator via phase inversion by selecting non-solvents from the combinatorial approach. Interestingly, the formation of PVdF–HFP skeletons was governed by the controlled phase inversion with various mixtures of water, methanol, ethanol and 2-propanol. For a single non-solvent system, a water-based non-solvent (4 wt% water) was the best choice for the phase-inversion-based PVdF–HFP separators for LIBs. However, when a mixture of 2 wt% water and 3 wt% methanol was used as the non-solvent, the best rate capability and long-term stability were obtained, which led to better LIB performances than those of commercialized polyethylene separators.