The effect of annealing on a 3D SnO2/graphene foam as an advanced lithium-ion battery anode.

ABSTRACT: 3D annealed SnO2/graphene sheet foams (ASGFs) are synthesized by in situ self-assembly of graphene sheets prepared by mild chemical reduction. L-ascorbyl acid is used to effectively reduce the SnO2 nanoparticles/graphene oxide colloidal solution and form the 3D conductive graphene networks. The annealing treatment contributes to the formation of the Sn-O-C bonds between the SnO2 nanoparticles and the reduced graphene sheets, which improves the electrochemical performance of the foams. The ASGF has features of typical aerogels: low density (about 19?mg cm(-3)), smooth surface and porous structure. The ASGF anodes exhibit good specific capacity, excellent cycling stability and superior rate capability. The first reversible specific capacity is as high as 984.2?mAh g(-1) at a specific current of 200?mA g(-1). Even at the high specific current of 1000?mA g(-1) after 150 cycles, the reversible specific capacity of ASGF is still as high as 533.7?mAh g(-1), about twice as much as that of SGF (297.6?mAh g(-1)) after the same test. This synthesis method can be scaled up to prepare other metal oxides particles/ graphene sheet foams for high performance lithium-ion batteries, supercapacitors, and catalysts, etc.

SUBMITTER: Tian R 

PROVIDER: S-EPMC4709726 | biostudies-literature | 2016 Jan

REPOSITORIES: biostudies-literature