期刊
ELECTROCHIMICA ACTA
卷 129, 期 -, 页码 55-61出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.02.077
关键词
separator modification; Al2O3 coating layer; polysulfides; lithium sulfur batteries
资金
- Strategic Emerging Industries Program of Shenzhen, China [JCYJ20120618164543322]
- National Natural Science Foundation of China [20803095]
- Engineering Research Center of Advanced Battery Materials, the Ministry of Education, China
In this paper, Al2O3-coated separator with developed porous channels is prepared to improve the electrochemical performance of lithium sulfur batteries. It is demonstrated that the Al2O3-coating layer is quite effective in reducing shuttle effect and enhancing the stability of the sulfur electrode. The initial discharge capacity of the cell with Al2O3-coated separator can reach 967 mAh g(-1) at the rate of 0.2 C. After 50th charge/discharge cycle, this cell can also deliver a reversible capacity of as high as 593.4 mAh g(-1). Significantly, the charge-transfer resistance of the electrode tends to be reducing after using Al2O3-coated separator. The improved cell performance is attributed to the porous architecture of the Al2O3-coating layer, which serves as an ion-conducting skeleton for trapping and depositing dissolved sulfur-containing active materials, as confirmed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). (C) 2014 Elsevier Ltd. All rights reserved.
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