Hierarchically porous graphene as a lithium-air battery electrode

Jie Xiao; Donghai Mei; Xiaolin Li; Wu Xu; Deyu Wang; Gordon L. Graff; Wendy D. Bennett; Zimin Nie; Laxmikant V. Saraf; Ilhan A. Aksay; Jun Liu; Ji Guang Zhang

doi:10.1021/nl203332e

Hierarchically porous graphene as a lithium-air battery electrode

Jie Xiao, Donghai Mei, Xiaolin Li, Wu Xu, Deyu Wang, Gordon L. Graff, Wendy D. Bennett, Zimin Nie, Laxmikant V. Saraf, Ilhan A. Aksay, Jun Liu, Ji Guang Zhang

Research output: Contribution to journal › Article › peer-review

929 Scopus citations

Abstract

The lithium-air battery is one of the most promising technologies among various electrochemical energy storage systems. We demonstrate that a novel air electrode consisting of an unusual hierarchical arrangement of functionalized graphene sheets (with no catalyst) delivers an exceptionally high capacity of 15000 mAh/g in lithium-O₂ batteries which is the highest value ever reported in this field. This excellent performance is attributed to the unique bimodal porous structure of the electrode which consists of microporous channels facilitating rapid O₂ diffusion while the highly connected nanoscale pores provide a high density of reactive sites for Li-O₂ reactions. Further, we show that the defects and functional groups on graphene favor the formation of isolated nanosized Li₂O₂ particles and help prevent air blocking in the air electrode. The hierarchically ordered porous structure in bulk graphene enables its practical applications by promoting accessibility to most graphene sheets in this structure.

Original language	English (US)
Pages (from-to)	5071-5078
Number of pages	8
Journal	Nano Letters
Volume	11
Issue number	11
DOIs	https://doi.org/10.1021/nl203332e
State	Published - Nov 9 2011

All Science Journal Classification (ASJC) codes

General Chemistry
Condensed Matter Physics
Mechanical Engineering
Bioengineering
General Materials Science

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10.1021/nl203332e

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title = "Hierarchically porous graphene as a lithium-air battery electrode",

abstract = "The lithium-air battery is one of the most promising technologies among various electrochemical energy storage systems. We demonstrate that a novel air electrode consisting of an unusual hierarchical arrangement of functionalized graphene sheets (with no catalyst) delivers an exceptionally high capacity of 15000 mAh/g in lithium-O2 batteries which is the highest value ever reported in this field. This excellent performance is attributed to the unique bimodal porous structure of the electrode which consists of microporous channels facilitating rapid O2 diffusion while the highly connected nanoscale pores provide a high density of reactive sites for Li-O2 reactions. Further, we show that the defects and functional groups on graphene favor the formation of isolated nanosized Li2O2 particles and help prevent air blocking in the air electrode. The hierarchically ordered porous structure in bulk graphene enables its practical applications by promoting accessibility to most graphene sheets in this structure.",

author = "Jie Xiao and Donghai Mei and Xiaolin Li and Wu Xu and Deyu Wang and Graff, {Gordon L.} and Bennett, {Wendy D.} and Zimin Nie and Saraf, {Laxmikant V.} and Aksay, {Ilhan A.} and Jun Liu and Zhang, {Ji Guang}",

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T1 - Hierarchically porous graphene as a lithium-air battery electrode

AU - Xiao, Jie

AU - Mei, Donghai

AU - Li, Xiaolin

AU - Xu, Wu

AU - Wang, Deyu

AU - Graff, Gordon L.

AU - Bennett, Wendy D.

AU - Nie, Zimin

AU - Saraf, Laxmikant V.

AU - Aksay, Ilhan A.

AU - Liu, Jun

AU - Zhang, Ji Guang

PY - 2011/11/9

Y1 - 2011/11/9

N2 - The lithium-air battery is one of the most promising technologies among various electrochemical energy storage systems. We demonstrate that a novel air electrode consisting of an unusual hierarchical arrangement of functionalized graphene sheets (with no catalyst) delivers an exceptionally high capacity of 15000 mAh/g in lithium-O2 batteries which is the highest value ever reported in this field. This excellent performance is attributed to the unique bimodal porous structure of the electrode which consists of microporous channels facilitating rapid O2 diffusion while the highly connected nanoscale pores provide a high density of reactive sites for Li-O2 reactions. Further, we show that the defects and functional groups on graphene favor the formation of isolated nanosized Li2O2 particles and help prevent air blocking in the air electrode. The hierarchically ordered porous structure in bulk graphene enables its practical applications by promoting accessibility to most graphene sheets in this structure.

AB - The lithium-air battery is one of the most promising technologies among various electrochemical energy storage systems. We demonstrate that a novel air electrode consisting of an unusual hierarchical arrangement of functionalized graphene sheets (with no catalyst) delivers an exceptionally high capacity of 15000 mAh/g in lithium-O2 batteries which is the highest value ever reported in this field. This excellent performance is attributed to the unique bimodal porous structure of the electrode which consists of microporous channels facilitating rapid O2 diffusion while the highly connected nanoscale pores provide a high density of reactive sites for Li-O2 reactions. Further, we show that the defects and functional groups on graphene favor the formation of isolated nanosized Li2O2 particles and help prevent air blocking in the air electrode. The hierarchically ordered porous structure in bulk graphene enables its practical applications by promoting accessibility to most graphene sheets in this structure.

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JO - Nano Letters

JF - Nano Letters

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ER -

Hierarchically porous graphene as a lithium-air battery electrode

Abstract

All Science Journal Classification (ASJC) codes

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