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Covalently‐Bonded Poly(vinyl alcohol)‐Silica Composite Nanofiber Separator with Enhanced Wettability and Thermal Stability for Lithium‐Ion Battery
Author(s) -
Chen Shilin,
Zhang Zhixiong,
Li Li,
Yuan Wenhui
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802794
Subject(s) - vinyl alcohol , materials science , membrane , nanofiber , separator (oil production) , thermal stability , polyolefin , chemical engineering , electrospinning , electrolyte , composite number , wetting , polypropylene , ionic conductivity , porosity , polymer chemistry , composite material , polymer , layer (electronics) , chemistry , electrode , biochemistry , physics , engineering , thermodynamics
Covalently‐bonded poly(vinyl alcohol)‐silica (PVA‐SiO 2 ) composite nanofiber membranes are fabricated via sol‐gel electrospinning and their physical and electrochemical properties are investigated for application as separators in lithium‐ion batteries (LIBs). Experimental results demonstrate the PVA‐SiO 2 membranes possess a unique three‐dimensional interconnected porous structure and display higher porosity (73%), better electrolyte affinity, higher electrolyte uptake (405%) and lower thermal shrinkage compared to commercial polypropylene (PP) membranes. In addition, batteries using PVA‐SiO 2 composite nanofiber membranes as separators exhibit enhanced ionic conductivity (1.81 mS cm −1 ), superior cycling stability and C‐rate performance than those using PP separators. These findings reveal that the PVA‐SiO 2 composite nanofiber membrane might be a promising alternative to commercial polyolefin separator for high performance LIBs.