A high-safety PVDF/Al2O3 composite separator for Li-ion batteries via tip-induced electrospinning and dip-coating. Issue 39 (4th May 2017)

• Record Type: Journal Article
• Authors: Wu, Dezhi; Deng, Lei; Sun, Yu; Teh, Kwok Siong; Shi, Chuan; Tan, Qiulin; Zhao, Jinbao; Sun, Daoheng; Lin, Liwei
• Is Part Of: RSC advances. Volume 7:Issue 39(2017)
• Page Start: 24410
• Page End: 24416
• Publication Date: 2017-05-04
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra02681a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Composite membranes have been fabricated made of ultrafine PVDF fibers via a tip-induced electrospinning (TIE) process and Al2 O3 nanoparticles via a dip-coating process. Abstract : Composite membranes have been fabricated made of ultrafine PVDF fibers via a tip-induced electrospinning (TIE) process and Al2 O3 nanoparticles via a dip-coating process. These membranes exhibit good thermal stability and electrochemical properties as the separators for applications in lithium ion batteries (LIBs). Experimental results show that the as-fabricated separators may mechanically contract less than 2% when kept at a high temperature of 140 °C for an hour showing good thermal stability as compared with commercial polypropylene separators and electrospun PVDF membranes. The membrane has a measured porosity of 55.8% and ionic conductivity of 2.23 mS cm −1, achieving a low battery discharge capacity loss of 1.8% after 100 cycles in the 1.0C-rate tests, and a retention rate of 92.9% in the 4C-rate tests. These results show the great potential of PVDF/Al2 O3 separators in LIB applications under high temperature and high current/power operations.