Covalently‐Bonded Poly(vinyl alcohol)‐Silica Composite Nanofiber Separator with Enhanced Wettability and Thermal Stability for Lithium‐Ion Battery | Zendy

Chen Shilin | Zendy; Zhang Zhixiong | Zendy; Li Li | Zendy; Yuan Wenhui | Zendy

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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.

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