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3872232 
Journal Article 
A high-safety PVDF/Al2O3 composite separator for Li-ion batteries via tip-induced electrospinning and dip-coating 
Wu, D; Deng, Lei; Sun, Yu; Teh, KS; Shi, C; Tan, Q; Zhao, J; Sun, D; Lin, L 
2017 
1 
RSC Advances
EISSN: 2046-2069 
7 
39 
24410-24416 
WOS:000401525500061 
Composite membranes have been fabricated made of ultrafine PVDF fibers via a tip-induced electrospinning (TIE) process and Al2O3 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 degrees 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/Al2O3 separators in LIB applications under high temperature and high current/power operations.