Abstract
In order to improve electrochemical performance of inert SiO2 anode for lithium ion batteries, submicro-sized porous SiO2/C and SiO2/C/graphene spheres with the same SiO2 content (43 wt.%) have been synthesized through a simple suspension nebulization and spray pyrolysis method followed by carbonization, where the components of the spheres are mixed uniformly. The addition of graphene results in mesoporous structure of the SiO2/C/graphene spheres. The electrochemical performances of the porous SiO2/C and SiO2/C/graphene spheres have been evaluated, which indicate that the SiO2/C/graphene spheres exhibits much higher cyclic capacity and stability than SiO2/C with reversible capacity retention of 97% over 100 cycles. The graphene additives display very strong effects in reducing charge transfer resistance and improving structural stability of the porous spheres simultaneously. The mesoporous SiO2/C/graphene spheres are promising anode candidate for high energy-density lithium ion batteries.
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