Activated carbon aerogels with high bimodal porosity for lithium/sulfur batteries

被引：22

作者：

Jiang, Shaofeng ^{[1
]}

Zhang, Zhian ^{[1
,2
]}

Qu, Yaohui ^{[1
]}

Wang, Xiwen ^{[1
]}

Li, Qiang ^{[1
]}

Lai, Yanqing ^{[1
,2
]}

Li, Jie ^{[1
,2
]}

机构：

[1] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China

[2] Cent S Univ, Engn Res Ctr High Performance Battery Mat & Devic, Res Inst, Shenzhen 518057, Peoples R China

来源：

JOURNAL OF SOLID STATE ELECTROCHEMISTRY | 2014年 / 18卷 / 02期

关键词：

Lithium-sulfur batteries; KOH activation; Sulfur-activated carbon aerogels composites; Chemical deposition; KOH ACTIVATION; CATHODE MATERIALS; SULFUR CATHODE; COMPOSITE; PERFORMANCE;

D O I：

10.1007/s10008-013-2290-1

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Activated carbon aerogels (ACAs) with high bimodal porosity were obtained for lithium/sulfur batteries by potassium hydroxide (KOH) activation. Then sulfur-activated carbon aerogels (S-ACAs) composites were synthesized by chemical deposition strategy. The S-ACAs composites were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy, and N-2 adsorption/desorption measurements. It is found that the activated carbon aerogels treated by KOH activation presents a porous structure, and sulfur is embedded into the pores of the ACAs network-like matrix after a chemical deposition process. The Li/S-ACAs (with 69.1 wt% active material) composite cathode exhibits discharge capacities of 1,493 mAh g(-1) in the first cycle and 528 mAh g(-1) after 100 cycles at a higher rate of C/5 (335 mA g(-1)). The S-ACAs composite cathode exhibits better electrochemical reversibility, higher active material utilization, and less severe polysulfide shuttle than S-CAs composite cathode because of high bimodal porosity structure of the ACAs matrix.

引用

页码：545 / 551

页数：7

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