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Nanostructured SiO2/C composites prepared via electrospinning and their electrochemical properties for lithium ion batteries.
Nanostructured SiO2/C composites prepared via electrospinning and their electrochemical properties for lithium ion batteries.
A series of nanostructured silica–carbon composites containing different contents of SiO2 nanoparticleshave been prepared from SiO2 nanoparticles-incorporated polyacrylonitrile (PAN) fibers via electrospinningand subsequent thermal treatment. The SiO2/C composites as negative material for lithium ion batteriesbenefit from both the high capacity of nano-SiO2 and the good performance of stable 3Dnanostructured carbonaceous matrix. The nanostucture can effectively resist large volume changes andaccelerate both the lithium ions diffusion and the electronic migration. The SiO2 content significantlyaffects on both the morphology and the electrochemical performance of the SiO2/C composites. It is foundthat the composite obtained from the SiO2/PAN fibers with 15 wt% SiO2 exhibits a large capacity of658 mAh g1 after 100 cycles at a current density of 50 mA g1 and retains 356 mAh g1 at1000 mA g1, showing the best performance with high capacity, good rate capability and excellentcycling stability.
