Superior lithium storage in a 3D macroporous graphene framework/SnO sub(2) nanocomposite

A three-dimensional (3D) interconnected graphene framework (GF)-based SnO sub(2) nanocomposite (3D SnO sub(2)/GFs) was prepared using self-assembly of polystyrene (PS)nO sub(2) nanospheres and graphene oxide (GO) nanosheets under suitable pH conditions, followed by a thermal treatment. The electroac...

Full description

Saved in:
Bibliographic Details
Published in:Nanoscale 2014-06, Vol.6 (14), p.7817-7822
Main Authors: Liu, Xiaowu, Cheng, Jianxiu, Li, Weihan, Zhong, Xiongwu, Yang, Zhenzhong, Gu, Lin, Yu, Yan
Format: Article
Language:English
Subjects:
Graphene
Lithium
Nanostructure
Self assembly
Three dimensional
Tin dioxide
Tin oxides
Walls
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A three-dimensional (3D) interconnected graphene framework (GF)-based SnO sub(2) nanocomposite (3D SnO sub(2)/GFs) was prepared using self-assembly of polystyrene (PS)nO sub(2) nanospheres and graphene oxide (GO) nanosheets under suitable pH conditions, followed by a thermal treatment. The electroactive material (SnO sub(2)) is anchored to the wall of electrochemically and ionically conductive 3D interconnected GFs. When used as anodes for LIBs, the 3D SnO sub(2)/GFs deliver an excellent reversible capacity (1244 mA h g super(-1) in 50 cycles at 100 mA g super(-1)) and outstanding rate capability (754 mA h g super(-1) in 200 cycles at 1000 mA g super(-1)). The ultra-small size of SnO sub(2) (sub 10 nm) and dimensional confinement of SnO sub(2) nanoparticles by the wall of GFs limit the volume expansion upon lithium insertion, and the 3D interconnected porous structures serve as buffered spaces during charge-discharge and result in superior electrochemical performance by facilitating the electrolyte to contact the entire nanocomposite materials and reduce lithium diffusion length in the nanocomposite.
ISSN:2040-3364
2040-3372
DOI:10.1039/c4nr01493f