Novel synthesis method of cobalt hydroxycarbonate hydrate-reduced graphene oxide composite microspheres for lithium-ion battery anode

Dae Hyun Kim, Gi Dae Park, Yun Chan Kang

Research output: Contribution to journalArticlepeer-review

Abstract

Transition metal compounds (TMCs) consisting of multiple anions are considered as efficient anode materials for lithium-ion batteries (LIBs) owing to their characteristic of transforming into multiple metal compounds with single anions during the first cycle. Nanostructured composites of TMCs with multiple anions and a conductive carbon component can enhance lithium-ion storage through the synergistic effects of the formation of heterointerfaced structures, structural stability, and high conductivity. Herein, cobalt hydroxycarbonate hydrate-reduced graphene oxide (CoHC-rGO) composite microspheres are introduced. The spray pyrolysis process facilitates formation of cobalt chloride-rGO composite precursor powders. The prepared precursor powders are finally converted into CoHC-rGO composites through in-situ precipitation within the microspheres. The conversion mechanism of CoHC-rGO with lithium ions is systemically scrutinized via rational in-situ and ex-situ analyses. Uniquely structured CoHC-rGO microspheres exhibit better electrochemical properties than the bare CoHC nanopowders. The CoHC-rGO microspheres have high reversibility of 440 mA h g−1 at 1500th cycle even at 5 A g−1.

Original languageEnglish
Pages (from-to)20302-20317
Number of pages16
JournalInternational Journal of Energy Research
Volume45
Issue number14
DOIs
Publication statusPublished - 2021 Nov

Keywords

  • conversion reaction
  • heterointerfaced structure
  • lithium-ion batteries
  • metal hydroxy carbonate hydrate
  • reduced graphene oxide

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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