期刊
CARBON
卷 139, 期 -, 页码 1117-1125出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2018.06.035
关键词
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资金
- National Natural Science Foundation of China [21501071, 51672113]
- Six Talents Peak Project of Jiangsu Province [2016-XNYQC-003, 2015-XNYQC-008]
- Special Funds for the Transformation of Scientific and Technological Achievements in Jiangsu Province [BA2016162]
- National Key Technology R&D Program of China [2015BAG07B00]
Sodium-ion batteries are widely regarded as an alternative to lithium ion batteries, especially in large-scale energy storage applications. Developing a negative electrode material with high specific capacity and excellent cyclic stability is one of the most pressing problems for sodium-ion batteries. Herein, nitrogen and phosphorous dual-doped graphene aerogel (NPGA) is fabricated via a low temperature phosphidation of NH2-rich graphene aerogel precursor. Expanded interlayer spacing of 0.39 nm and high content of pyridinic-N are obtained in this architecture. These features lead to high sodium storage performance of NPGA, however, in a wide potential range. A large reversible capacity of 330 mAh g(-1) at 50 mA g(-1), and good rate capability of 218 mAh g(-1) at 1 A g(-1) and 189 mAh g(-1) at 3 A g(-1) can be achieved in the potential range from 0.005 to 3.0 V (vs. Na/Na+). Moreover, it delivers ultra-stable capacities of 195 mAh g(-1) at 1 A g(-1) after 1000 cycles and 132 mAh g(-1) at 5 A g(-1) after 2000 cycles. It should be underlined that in practice only half of this capacity values could be utilized in Na-ion accumulators, i.e., the capacity supplied from 0.005 to 1.5 V (vs. Na/Na+). The attractive electrochemical performance should be ascribed to the remarkable capacitive contribution. This strategy would be readily applied to construct high-performance carbonaceous anodes for sodium-ion batteries and/or electrochemical capacitors. (C) 2018 Elsevier Ltd. All rights reserved.
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