Sandwich-type functionalized graphene sheet-sulfur nanocomposite for rechargeable lithium batteries

被引：329

作者：

Cao, Yuliang ^{[1
,2
]}

Li, Xiaolin ^{[1
]}

Aksay, Ilhan A. ^{[3
]}

Lemmon, John ^{[1
]}

Nie, Zimin ^{[1
]}

Yang, Zhenguo ^{[1
]}

Liu, Jun ^{[1
]}

机构：

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

[2] Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China

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

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2011年 / 13卷 / 17期

关键词：

COMPOSITE CATHODE MATERIALS; IONIC LIQUID ELECTROLYTE; GLYCOL) DIMETHYL ETHER; CARBON COMPOSITES; PERFORMANCE; CELL; GRAPHITE; STORAGE; ENERGY;

D O I：

10.1039/c0cp02477e

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A functionalized graphene sheet-sulfur (FGSS) nanocomposite was synthesized as the cathode material for lithium-sulfur batteries. The structure has a layer of functionalized graphene sheets/stacks (FGS) and a layer of sulfur nanoparticles creating a three-dimensional sandwich-type architecture. This unique FGSS nanoscale layered composite has a high loading (70 wt%) of active material (S), a high tap density of similar to 0.92 g cm(-3), and a reversible capacity of similar to 505 mAh g(-1) (similar to 464 mAh cm(-3)) at a current density of 1680 mA g(-1) (1C). When coated with a thin layer of cation exchange Nafion film, the migration of dissolved polysulfide anions from the FGSS nanocomposite was effectively reduced, leading to a good cycling stability of 75% capacity retention over 100 cycles. This sandwich-structured composite conceptually provides a new strategy for designing electrodes in energy storage applications.

引用

页码：7660 / 7665

页数：6