Abstract
A superfine Li0.33La0.557TiO3 (LLTO, 69.4 nm) was successfully synthesized by a facile solvent-thermal method to enhance the electrochemical properties of the lithium-ion battery separator. Co-axial nanofiber of cellulose and Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) was prepared by a co-axial electrospinning technique, in which the shell material was PVDF-HFP and the core was cellulose. LLTO superfine nanoparticles were incorporated into the shell of the PVDF-HFP. The core–shell composite nanofibrous membrane showed good wettability (16.5°, contact angle), high porosity (69.77%), and super electrolyte compatibility (497%, electrolyte uptake). It had a higher ionic conductivity (13.897 mS·cm−1) than those of pure polymer fibrous membrane and commercial separator. In addition, the rate capability (155.56 mAh·g−1) was also superior to the compared separator. These excellent performances endowed LLTO composite nanofibrous membrane as a promising separator for high-performance lithium-ion batteries.
Highlights
High energy demands have accelerated emergent efforts to develop high-performance lithium-ion batteries (LIBs) due to their high specific energy and long cycle lifetime [1,2,3]
The composite LLTO nanofibrous membrane containing 8% LLTO was that the electrochemical stability of the composite nanofibrous membranes improved with an found to exhibit the highest ionic conductivity (13.897 mScm1 )
Our LSV results showed that increase in the LLTO content
Summary
High energy demands have accelerated emergent efforts to develop high-performance lithium-ion batteries (LIBs) due to their high specific energy and long cycle lifetime [1,2,3]. A separator in LIB is considered as a key component to prevent safety issues, because it can isolate the cathode and anode to prevent electrical short circuits and at the same time allow rapid transport of ionic charge carriers [4,5,6]. Polyolefin separators such as polyethylene (PE) and polypropylene (PP) have been widely used in LIBs [7]. Some new materials and functional methods have been attempted for application in separators
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