Cobalt carbonate/ and cobalt oxide/graphene aerogel composite anodes for high performance li-ion batteries

Mohammad Akbari Garakani, Sara Abouali, Biao Zhang, Curtis Alton Takagi, Zheng Long Xu, Jian Qiu Huang, Jiaqiang Huang, Jang Kyo Kim

Research output: Journal article publicationJournal articleAcademic researchpeer-review

104 Citations (Scopus)

Abstract

Nanocomposites consisting of ultrafine, cobalt carbonate nanoneedles and 3D porous graphene aerogel (CoCO3/GA) are in situ synthesized based on a one-step hydrothermal route followed by freeze-drying. A further heat treatment produces cobalt oxide nanoparticles embedded in the conductive GA matrix (Co3O4/GA). Both the composite anodes deliver excellent specific capacities depending on current density employed: the CoCO3/GA anode outperforms the Co3O4/GA anode at low current densities, and vice versa at current densities higher than 500 mA g-1. Their electrochemical performances are considered among the best of similar composite anodes consisting of CoCO3 or Co3O4 active particles embedded in a graphene substrate. The stable multistep electrochemical reactions of the carbonate compound with a unique nanoneedle structure contribute to the excellent cyclic stability of the CoCO3/GA electrode, whereas the highly conductive networks along with low charge transfer resistance are responsible for the high rate performance of the Co3O4/GA electrode.
Original languageEnglish
Pages (from-to)18971-18980
Number of pages10
JournalACS Applied Materials and Interfaces
Volume6
Issue number21
DOIs
Publication statusPublished - 1 Jan 2014
Externally publishedYes

Keywords

  • anode
  • cobalt carbonate
  • cobalt oxide
  • graphene aerogel
  • hydrothermal process
  • Li-ion battery

ASJC Scopus subject areas

  • Materials Science(all)

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