期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 11, 页码 8789-8795出版社
AMER CHEMICAL SOC
DOI: 10.1021/am501627f
关键词
batteries; lithium-sulfur batteries; sulfur/carbon composite; boron doping; electrochemical properties
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09010300]
- National Natural Science Foundation of China [51225204, 91127044, 21121063, U1301244]
- National Basic Research Program of China [2011CB935700, 2012CB932900, 2013AA050903]
- Chinese Academy of Sciences
To exploit the high energy density of lithium-sulfur batteries, porous carbon materials have been widely used as the host materials of the S cathode. Current studies about carbon hosts are more frequently focused on the design of carbon structures rather than modification of its properties. In this study, we use boron-doped porous carbon materials as the host material of the S cathode to get an insightful investigation of the effect of B dopant on the S/C cathode. Powder electronic conductivity shows that the B-doped carbon materials exhibit higher conductivity than the pure analogous porous carbon. Moreover, by X-ray photoelectron spectroscopy, we prove that doping with B leads to a positively polarized surface of carbon substrates and allows chemisorption of S and its polysulfides. Thus, the B-doped carbons can ensure a more stable S/C cathode with satisfactory conductivity, which is demonstrated by the electrochemical performance evaluation. The S/B-doped carbon cathode was found to deliver much higher initial capacity (1300 mA h g(-1) at 0.25 C), improved cyclic stability, and rate capability when compared with the cathode based on pure porous carbon. Electrochemical impedance spectra also indicate the low resistance of the S/B-doped C cathode and the chemisorption of polysulfide anions because of the presence of B. These features of B doping can play the positive role in the electrochemical performance of S cathodes and help to build better Li-S batteries.
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