Superior electrochemical properties of spherical-like Co2(OH)3 Cl-reduced graphene oxide composite powders with ultrafine nanocrystals

Gi Dae Park, Jong Heun Lee, Yun Chan Kang

Research output: Contribution to journalArticle

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Abstract

Co2(OH)3Cl/reduced graphene oxide (RGO) composite powders for use as anodes in lithium ion batteries were prepared directly by spray pyrolysis from a colloidal solution of graphene oxide sheets and cobalt chloride. Co2(OH)3Cl nanocrystals less than 10 nm in size were uniformly distributed throughout the spherical Co2 (OH) 3Cl/RGO composite powder. CoCl2 6H2-O/RGO, CoCl2 6H2O/Co3O4/RGO, and Co3O4 powders were also prepared by post-treatment of the Co2 (OH) 3Cl/RGO powders at 200, 300, and 400 °C, respectively, in air. The initial discharge capacities of the Co2(OH)3Cl/RGO, CoCl2 6H2O/RGO, CoCl2 6H2O/Co3O4/RGO, and Co3O4 powder electrodes at a current density of 1000 mA g-1 were 1685, 1518, 1655, and 1046 mA h g-1, respectively, and their discharge capacities after 200 cycles were 1186, 1030, 884, and 805 mA h g-1, respectively. The discharge capacities of the Co2 (OH) 3Cl/RGO composite powder electrode for the 2nd and 600th cycles at a current density of 5000 mA g-1 were 1063 and 833 mA h g-1, respectively. The Co2 (OH)3Cl/RGO powders had smaller charge transfer resistance and faster lithium-ion diffusion rate than the other materials.

Original languageEnglish
Pages (from-to)14-23
Number of pages10
JournalCarbon
Volume84
Issue numberC
DOIs
Publication statusPublished - 2015

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Electrochemical properties
Powders
Nanocrystals
Oxides
Composite materials
Ultrafine
Current density
Electrodes
Spray pyrolysis
Lithium
Discharge (fluid mechanics)
Charge transfer
Anodes
Ions

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Superior electrochemical properties of spherical-like Co2(OH)3 Cl-reduced graphene oxide composite powders with ultrafine nanocrystals. / Park, Gi Dae; Lee, Jong Heun; Kang, Yun Chan.

In: Carbon, Vol. 84, No. C, 2015, p. 14-23.

Research output: Contribution to journalArticle

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abstract = "Co2(OH)3Cl/reduced graphene oxide (RGO) composite powders for use as anodes in lithium ion batteries were prepared directly by spray pyrolysis from a colloidal solution of graphene oxide sheets and cobalt chloride. Co2(OH)3Cl nanocrystals less than 10 nm in size were uniformly distributed throughout the spherical Co2 (OH) 3Cl/RGO composite powder. CoCl2 6H2-O/RGO, CoCl2 6H2O/Co3O4/RGO, and Co3O4 powders were also prepared by post-treatment of the Co2 (OH) 3Cl/RGO powders at 200, 300, and 400 °C, respectively, in air. The initial discharge capacities of the Co2(OH)3Cl/RGO, CoCl2 6H2O/RGO, CoCl2 6H2O/Co3O4/RGO, and Co3O4 powder electrodes at a current density of 1000 mA g-1 were 1685, 1518, 1655, and 1046 mA h g-1, respectively, and their discharge capacities after 200 cycles were 1186, 1030, 884, and 805 mA h g-1, respectively. The discharge capacities of the Co2 (OH) 3Cl/RGO composite powder electrode for the 2nd and 600th cycles at a current density of 5000 mA g-1 were 1063 and 833 mA h g-1, respectively. The Co2 (OH)3Cl/RGO powders had smaller charge transfer resistance and faster lithium-ion diffusion rate than the other materials.",
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N2 - Co2(OH)3Cl/reduced graphene oxide (RGO) composite powders for use as anodes in lithium ion batteries were prepared directly by spray pyrolysis from a colloidal solution of graphene oxide sheets and cobalt chloride. Co2(OH)3Cl nanocrystals less than 10 nm in size were uniformly distributed throughout the spherical Co2 (OH) 3Cl/RGO composite powder. CoCl2 6H2-O/RGO, CoCl2 6H2O/Co3O4/RGO, and Co3O4 powders were also prepared by post-treatment of the Co2 (OH) 3Cl/RGO powders at 200, 300, and 400 °C, respectively, in air. The initial discharge capacities of the Co2(OH)3Cl/RGO, CoCl2 6H2O/RGO, CoCl2 6H2O/Co3O4/RGO, and Co3O4 powder electrodes at a current density of 1000 mA g-1 were 1685, 1518, 1655, and 1046 mA h g-1, respectively, and their discharge capacities after 200 cycles were 1186, 1030, 884, and 805 mA h g-1, respectively. The discharge capacities of the Co2 (OH) 3Cl/RGO composite powder electrode for the 2nd and 600th cycles at a current density of 5000 mA g-1 were 1063 and 833 mA h g-1, respectively. The Co2 (OH)3Cl/RGO powders had smaller charge transfer resistance and faster lithium-ion diffusion rate than the other materials.

AB - Co2(OH)3Cl/reduced graphene oxide (RGO) composite powders for use as anodes in lithium ion batteries were prepared directly by spray pyrolysis from a colloidal solution of graphene oxide sheets and cobalt chloride. Co2(OH)3Cl nanocrystals less than 10 nm in size were uniformly distributed throughout the spherical Co2 (OH) 3Cl/RGO composite powder. CoCl2 6H2-O/RGO, CoCl2 6H2O/Co3O4/RGO, and Co3O4 powders were also prepared by post-treatment of the Co2 (OH) 3Cl/RGO powders at 200, 300, and 400 °C, respectively, in air. The initial discharge capacities of the Co2(OH)3Cl/RGO, CoCl2 6H2O/RGO, CoCl2 6H2O/Co3O4/RGO, and Co3O4 powder electrodes at a current density of 1000 mA g-1 were 1685, 1518, 1655, and 1046 mA h g-1, respectively, and their discharge capacities after 200 cycles were 1186, 1030, 884, and 805 mA h g-1, respectively. The discharge capacities of the Co2 (OH) 3Cl/RGO composite powder electrode for the 2nd and 600th cycles at a current density of 5000 mA g-1 were 1063 and 833 mA h g-1, respectively. The Co2 (OH)3Cl/RGO powders had smaller charge transfer resistance and faster lithium-ion diffusion rate than the other materials.

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