Enhanced Cyclability for Sulfur Cathode Achieved by a Water-Soluble Binder

被引:204
作者
He, Min [1 ,2 ]
Yuan, Li-Xia [1 ]
Zhang, Wu-Xing [1 ]
Hu, Xian-Luo [1 ]
Huang, Yun-Hui [1 ]
机构
[1] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mold Technol, Wuhan 430074, Hubei, Peoples R China
[2] Wuhan Univ Sci & Technol, Sch Sci, Wuhan 430065, Hubei, Peoples R China
关键词
LI-ION; ELECTROCHEMICAL PROPERTIES; NEGATIVE ELECTRODES; COMPOSITE CATHODE; DISCHARGE PROCESS; CYCLE PROPERTY; GRAPHITE ANODE; PERFORMANCE; BATTERIES; IMPROVEMENT;
D O I
10.1021/jp2043416
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
The electrochemical properties of sulfur cathodes based on commercially available sulfur powder (S) and water-soluble binder have been investigated. The mixture of styrene butadiene rubber (SBR) and sodium carboxyl methyl cellulose (CMC) is used as the binder. Compared with conventional poly(vinylidene fluoride) (PVDF) binder, the SBR CMC binder significantly improves cycling performance of the sulfur cathode. A high specific capacity of 580 mA h g(-1) after 60 cycles has been achieved. Studies on the electrode slurries show that the SBR-CMC mixture is not only a high adhesion agent but also a strong dispersion medium, which favors the uniform distribution between insulating sulfur and conductive carbon black (CB) and ensures a good electrical contact, leading to a high sulfur utilization. Furthermore, our experiments show that the improvement in cyclability is ascribed to structural stability of the sulfur cathode promoted by the SBR-CMC binder during charge/discharge cycles due to the combined effects of homogeneous distribution of the S and CB particles in the composite cathode, the low electrolyte uptake, and the suppressed agglomeration of Li2S,
引用
收藏
页码:15703 / 15709
页数:7
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