Three-dimensional porous graphene-metal oxide composite microspheres: Preparation and application in Li-ion batteries

Seung Ho Choi, Jung Kul Lee, Yun Chan Kang

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

The use of new three-dimensional (3D) porous graphene-metal oxide composite microspheres as an anode material for Li-ion batteries (LIBs) is first introduced here. 3D graphene microspheres are aggregates of individual hollow graphene nanospheres composed of graphene sheets. Metal oxide nanocrystals are uniformly distributed over the graphene surface of the microspheres. The 3D porous graphene-SnO2 microspheres are selected as the first target material for investigation because of their superior electrochemical properties. The 3D porous graphene-SnO2 and graphene microspheres and bare SnO2 powders deliver discharge capacities of 1,009, 196, and 52 mAh·g−1, respectively, after 500 cycles at a current density of 2 A·g−1. The 3D porous graphene-SnO2 microspheres exhibit uniquely low charge transfer resistances and high Li-ion diffusivities before and after cycling.

Original languageEnglish
Pages (from-to)1584-1594
Number of pages11
JournalNano Research
Volume8
Issue number5
DOIs
Publication statusPublished - 2015 May 18

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Keywords

  • batteries
  • electrode material
  • graphene
  • metal oxide
  • nanostructures

ASJC Scopus subject areas

  • Materials Science(all)
  • Electrical and Electronic Engineering

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