Hierarchically Porous Graphene as a Lithium-Air Battery Electrode

被引：869

作者：

Xiao, Jie ^{[1
]}

Mei, Donghai ^{[1
]}

Li, Xiaolin ^{[1
]}

Xu, Wu ^{[1
]}

Wang, Deyu ^{[1
]}

Graff, Gordon L. ^{[1
]}

Bennett, Wendy D. ^{[1
]}

Nie, Zimin ^{[1
]}

Saraf, Laxmikant V. ^{[1
]}

Aksay, Ilhan A. ^{[2
]}

Liu, Jun ^{[1
]}

Zhang, Ji-Guang ^{[1
]}

机构：

[1] Pacific NW Natl Lab, Richland, WA 99352 USA

[2] Princeton Univ, Dept Chem & Biol Engn, Princeton, NJ 08544 USA

来源：

NANO LETTERS | 2011年 / 11卷 / 11期

关键词：

Li-air battery; graphene; specific energy; Li2O2; O-2; reduction; TOTAL-ENERGY CALCULATIONS; FUNCTIONALIZED GRAPHENE; OPTIMIZATION; PERFORMANCE; ADSORPTION; CATALYST; OXIDE;

D O I：

10.1021/nl203332e

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The lithium-ir 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-O-2 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 O-2 diffusion while the highly connected nanoscale pores provide a high density of reactive sites for Li-O-2 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.

引用

页码：5071 / 5078

页数：8

共 43 条

[1] A polymer electrolyte-based rechargeable lithium/oxygen battery [J].