Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 4, Issue 9, Pages 4498-4505Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b01218
Keywords
Gel polymer electrolyte; Soy protein isolate; Biodegradable; Nanofiber membranes; Skeleton matetirials
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Funding
- National Natural Science Foundation of China [51073019]
- Program for New Century Excellent Talents in University [NCET-12-0761]
- National High-tech R&D Program of China (863 Program) [2012AA03A203]
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A kind of biodegradable and well-sourced soy protein isolate (SPI)/poly(vinyl alcohol) (PVA) composite nanofiber membranes was fabricated via electrospinning and used as skeleton material in gel polymer electrolyte (GPE) of lithium-ion batteries. This study revealed that the proper material proportion, low crystallinity, sufficient porosity and good affinity between nanofiber and the electrode/electrolyte resulted in high saturated electrolyte uptake and conservation rate of the nanofiber membranes. The GPEs based on the SPI/PVA composite nanofiber membranes presented remarkable electrochemical performance, including high ionic conductivity, excellent compatibility with lithium electrode and good electrochemical stability. An ionic conductivity of 3.8 X 10(-3) S cm(-1) and interfacial resistance of 250 Omega. for the GPEs can be obtained when the weight ratio of SPI to RUA in the spinning solution was 3:1, which was more superior to the existing biobased GPEs. In addition, the Li/GPE/LiCoO2 cells with GPEs based on the SPI/PVA (3:1) composite nanofiber membranes displayed the excellent initial discharge capacity and cycle performance. Therefore, the environmental and economical SPI/PVA composite nanofiber membranes with the optimized material proportion can be used as a green skeleton material in GPEs for high performance lithium-ion batteries.
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