Fabrication of Si Nanoparticles Encapsulated into Porous N-Doped Carbon for Superior Lithium Storage Performances.

Author(s) Tang, Z.H.; Xie, J.F.; Bian, Z.X.; Zhang, J.H.; Liu, Y.J.; Guo, X.M.; Kong, Q.H.; Yuan, A.H.
Journal J Nanosci Nanotechnol
Date Published 2020 Feb 01
Abstract

To improve lithium storage performances of Si anode for lithium-ion batteries, Si nanoparticles encapsulated into porous N-doped carbon (Si@PNC) was devised and prepared by metal nitrate accelerated polymer blowing process. The Si@PNC composites have large specific surface area of 221.7 m² g and possess a great deal of mesopores and micropores, which are attributed to the carbonization of PVP and etching metallic nanoparticles. As anode for lithium ion battery, the initial discharge capacity of Si@PNC composites is high to 1626 mA h g, and the specific capacity still retains 1030 mA h g after 200 cycles at 200 mA g. Meanwhile, remarkably improved rate capability is achieved with an excellent reversible specific capacity of 375 mA h g at 5.0 A g. The excellent lithium storage performances benefit from the unique porous core-shell structure of Si@PNC composites, which improve electroconductivity, reduce volume dilatation and accelerate lithium ion transmission.

DOI 10.1166/jnn.2020.16927
ISSN 1533-4899
Citation Tang Z-, Xie J-, Bian Z-, Zhang J-, Liu Y-, Guo X-, et al. Fabrication of Si Nanoparticles Encapsulated into Porous N-Doped Carbon for Superior Lithium Storage Performances. J Nanosci Nanotechnol. 2020;20(2):949-956.

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