Role of Oxygen Functional Groups in Carbon Nanotube/Graphene Freestanding Electrodes for High Performance Lithium Batteries

被引：310

作者：

Byon, Hye Ryung ^{[1
]}

Gallant, Betar M. ^{[2
]}

Lee, Seung Woo ^{[2
]}

Shao-Horn, Yang ^{[2
]}

机构：

[1] RIKEN, Adv Sci Inst, Wako, Saitama 3510198, Japan

[2] MIT, Dept Mech Engn & Mat Sci & Engn, Electrochem Energy Lab, Cambridge, MA 02139 USA

来源：

ADVANCED FUNCTIONAL MATERIALS | 2013年 / 23卷 / 08期

基金：

美国国家科学基金会;

关键词：

graphene; carbon nanotubes; hierarchical structures; lithium batteries; energy storage; EXFOLIATED GRAPHITE OXIDE; HIGH-POWER; SUPERCAPACITOR PERFORMANCE; GRAPHENE NANOSHEETS; AQUEOUS DISPERSIONS; CHEMICAL-REDUCTION; COMPOSITE FILMS; PAPER; NANOTUBES; DEVICES;

D O I：

10.1002/adfm.201200697

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Hierarchical functionalized multiwalled carbon nanotube (MWNT)/graphene structures with thicknesses up to tens of micrometers and relatively high density (>1 g cm3) are synthesized using vacuum filtration for the positive electrode of lithium batteries. These electrodes, which are self-standing and free of binder and current collectors, utilize oxygen functional groups for Faradaic reactions in addition to double-layer charging, which can impart high gravimetric (230 Wh kg1 at 2.6 kW kg1) and volumetric (450 Wh L1 at 5 kW L1) performance. It is demonstrated that the gravimetric and volumetric capacity, capacitance, and energy density can be tuned by selective removal of oxygen species from as-prepared functionalized MWNT/graphene structures with heat treatments in H2/Ar, potentially opening new pathways for the design of electrodes with controlled surface chemistry.

引用

页码：1037 / 1045

页数：9

共 43 条

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