Journal
JOURNAL OF POWER SOURCES
Volume 255, Issue -, Pages 187-196Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.12.124
Keywords
Lithium-oxygen batteries; Air electrode; DMSO; Rate capability; Oxygen concentration; Mechanism
Funding
- China National Science Foundation-Youth Scientific Foundation [51302147]
- China Postdoctoral Science Foundation [2012M510022]
- Shenzhen Special funds for the Emerging Strategic Industry Development [JCYJ20120616220714779]
- Guangdong Province Innovative RD Team Plan
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As an appealing storage system for electric vehicle application, the lithium-oxygen battery could theoretically provide ultrahigh energy density; however, its attractive implementation is overshadowed by unsatisfactory electrochemical characteristics of the poor rate capability and the short span life. Here, we put forward one kind of effective strategy to ameliorate these deficiencies. By embedding a novel air electrode, the utilization level of the electrochemically available active sites is effectively increased and meanwhile the mass transfer of oxygen is signally improved. The evaporation speed of the solvent is greatly slowed down to some degree. We demonstrate that a super P-based lithium-O-2 battery could be operated over stable 50 cycles at the current density of 3000 mA g(Carbon)(-1) (equivalent to 2.4 mA cm(-2)), corresponding to a discharge time of about 20 min to 1000 mAh g(Carbon)(-1). Based on the weight of the super P and the resultant Li2O2, the specific power density could reach 4040 W kg(-1); even so, a substantial specific energy density of 1350 Wh kg(-1) still could be achieved. (C) 2014 Elsevier B.V. All rights reserved.
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