Core-Shelled Low-Oxidation State Oxides@Reduced Graphene Oxides Cubes via Pressurized Reduction for Highly Stable Lithium Ion Storage

Kan Zhang, Ping Li, Ming Ma, Jong Hyeok Park

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Metal oxides have been regarded as promising next-generation anode materials for rechargeable lithium ion batteries; however, their poor stability, which is caused by large volume changes during repeated lithiation/delithiation, remains a challenge. Here, conformally encapsulated low-oxidation state oxide cubes with reduced graphene oxide (RGO) obtained via a new pressurized reduction consisting of external mechanical compression and internal thermokinetic reduction from highly porous metal oxides/RGO aerogel (RGOA) are reported. Using single crystalline (SC) cobalt oxides and iron oxide cubes as model systems, the SC-Co3O4 or Fe2O3 cube/RGOA are pressurized into compacted xerogel along with a uniform thermokinetic reduction, which result in topotactic transformation to core-shelled CoO/RGO or Fe3O4@RGO cubes. The SC-CoO and SC-Fe3O4 cubes isolated perfectly in the RGO shells have dramatically improved their cycling stabilities for lithium ion storage to hundreds of times. The lithium-ion storage stability of the core/shelled low-oxidation state oxide/RGO cubes can be prolonged by at least 400 times.

Original languageEnglish
Pages (from-to)2959-2965
Number of pages7
JournalAdvanced Functional Materials
Volume26
Issue number17
DOIs
Publication statusPublished - 2016 May 3

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ion storage
Graphite
Lithium
Oxides
Graphene
graphene
lithium
Ions
Oxidation
oxidation
oxides
Crystalline materials
aerogels
Aerogels
metal oxides
storage stability
Metals
xerogels
cobalt oxides
Xerogels

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Electrochemistry

Cite this

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title = "Core-Shelled Low-Oxidation State Oxides@Reduced Graphene Oxides Cubes via Pressurized Reduction for Highly Stable Lithium Ion Storage",
abstract = "Metal oxides have been regarded as promising next-generation anode materials for rechargeable lithium ion batteries; however, their poor stability, which is caused by large volume changes during repeated lithiation/delithiation, remains a challenge. Here, conformally encapsulated low-oxidation state oxide cubes with reduced graphene oxide (RGO) obtained via a new pressurized reduction consisting of external mechanical compression and internal thermokinetic reduction from highly porous metal oxides/RGO aerogel (RGOA) are reported. Using single crystalline (SC) cobalt oxides and iron oxide cubes as model systems, the SC-Co3O4 or Fe2O3 cube/RGOA are pressurized into compacted xerogel along with a uniform thermokinetic reduction, which result in topotactic transformation to core-shelled CoO/RGO or Fe3O4@RGO cubes. The SC-CoO and SC-Fe3O4 cubes isolated perfectly in the RGO shells have dramatically improved their cycling stabilities for lithium ion storage to hundreds of times. The lithium-ion storage stability of the core/shelled low-oxidation state oxide/RGO cubes can be prolonged by at least 400 times.",
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Core-Shelled Low-Oxidation State Oxides@Reduced Graphene Oxides Cubes via Pressurized Reduction for Highly Stable Lithium Ion Storage. / Zhang, Kan; Li, Ping; Ma, Ming; Park, Jong Hyeok.

In: Advanced Functional Materials, Vol. 26, No. 17, 03.05.2016, p. 2959-2965.

Research output: Contribution to journalArticle

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