Journal
CHEMICAL ENGINEERING JOURNAL
Volume 343, Issue -, Pages 78-85Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.02.111
Keywords
Three-dimensional hierarchical porous nitrogen-doped carbon; Silicon nanoparticles; High voltage sputtering; Void space; Lithium-ion batteries
Categories
Funding
- National Natural Science Foundation of China [21466036, 21666037, 21677171, U1403192]
- Nature Science Foundation of Xinjiang Province [2015211C286, 2017D01C074]
- Young Scholar Science Foundation of Xinjiang Educational Institutions [XJEDU2016S030]
- Xinjiang International Science and Technology Cooperation Project [20166010]
- West Light Foundation of The Chinese Academy of Sciences [2016-YJRC-1]
- 1000-Talent Program (Recruitment Program of Global Expert, In Chinese: Qian-Ren-Ji-Hua)
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Various kinds of efforts have been devoted to ameliorate the serious volume-expansion effect and low electron conductivity of silicon-based materials in lithium ion batteries. Here, we report a facile high voltage sputtering process to prepare three-dimensional hierarchical porous nitrogen-doped carbon coated Si microsphere to significantly improve the lithium storage performance. The structure and morphology of the as-obtained samples are characterized by X-ray diffraction, transmission electron microscope and scanning electron microscope. The results indicate that the as-prepared composite is composed of silicon nanoparticles (similar to 100 nm) coated with conductive thin carbon layer (similar to 8.5 nm). The composite shows excellent lithium storage performance with a reversible capacity of 1565 mAh g(-1) after 100 cycles at a current density of 0.5 A g(-1), as well as a long cycling performance at the high current density of 2 A g(-1). The facile preparation process and highly silicon-loading (similar to 78%) makes the prepared material be a great potential application in lithium-ion batteries.
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