Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 851, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156791
Keywords
Biomass; Oak seeds; Sulfur and phosphorus co-doped; Hard carbon; Sodium storage; Cycle stability
Categories
Funding
- National Natural Science Foundation of China [21965034, U1903217, 21666037]
- Xinjiang Autonomous Region Major Projects [2017A02004]
- Resource Sharing Platform Construction Project of Xinjiang Province [PT1909]
- Nature Science Foundation of Xinjiang Province [2017D01C074]
- Young Scholar Science Foundation of Xinjiang Educational Institutions [XJEDU2016S030]
- Xinjiang Autonomous Region postgraduate scientific research and innovation projects [XJ2019G015]
- Doctoral Innovation Program of Xinjiang University [XJUBSCX-2017010]
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The S/P co-doped hard carbon prepared from biomass oak seeds through a one-step pyrolysis process exhibits excellent rate performance and cycling stability. The sulfur and phosphorus co-doping enlarges interlayer distance, modifies the electronic structure, and provides more effective active sites, enabling the hard carbon with fast, complete charge transfer kinetics for sodium storage.
Hard carbon has been considered as a promising anode material for sodium ion batteries (SIBs), while suffers from poor rate performance and some safety issues caused by irreversible or undesirable sodium plating. Heteroatom doping is an effective strategy to further improve the electrochemical performance of hard carbon. Herein, biomass oak seeds are selected as carbon source to prepare S/P co-doped hard carbon through a simple one-step pyrolysis process. The hard carbon pyrolyzed from oak seeds at 1000 degrees C (C1000) exhibits excellent rate performance (initial discharge capacity is 136.1 mA h g-1) and remarkable cycling stability (1000 cycles with 88% capacity retention at 1000 mA g-1). The unique S/P co-doping is very important to the high electrochemical performances, since sulfur and phosphorus co-doping enlarges interlayer distance, modifies the electronic structure, as well as provides more effective active sites, thereby enabling hard carbon with a fast, complete charge transfer kinetics of sodium storage. (C) 2020 Elsevier B.V. All rights reserved.
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