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Hollow double-layer carbon nanocage confined Si nanoparticles for high performance lithium-ion batteries

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Abstract

The huge volume variation and the unstable solid electrolyte interface (SEI) of Si (Si) during the lithiation and delithiation process severely obstruct its practical application as lithium-ion battery anodes. Here, we design and fabricate a hollow structure of double-layer hybrid carbon nanocage encapsulated Si nanoparticles to address these challenges. The double-layer hybrid carbon-Si nanoarchitecture is obtained by integrating electrostatic self-assembly, seed-induced growth and heterogeneous shrinkage. The internal layer of hollow N-doped carbon of the hybrid nanoarchitecture (Si@H-NC@GC) provides limited inner space for controlling volume changes of Si nanoparticles, while the outer graphite carbon layer facilitates the formation of a stable SEI. When evaluated as anode materials for LIBs, the Si@H-NC@GC nanoarchitecture exhibits greatly enhanced electrochemical performance compared with the bare Si, Si@NC and H-NC@GC electrodes. Notably, Si@H-NC@GC delivers a reversible capacity retention of 92.5% after 550 cycles at a high current density of 1 A g−1 and a high capacity of 1081 mA h g−1 after 500 cycles at 0.5 A g−1.

Graphical abstract: Hollow double-layer carbon nanocage confined Si nanoparticles for high performance lithium-ion batteries

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Supplementary files

Article information


Submitted
16 Apr 2020
Accepted
25 May 2020
First published
25 May 2020

This article is Open Access

Nanoscale Adv., 2020, Advance Article
Article type
Paper

Hollow double-layer carbon nanocage confined Si nanoparticles for high performance lithium-ion batteries

J. Lu, D. Wang, J. Liu, G. Qian, Y. Chen and Z. Wang, Nanoscale Adv., 2020, Advance Article , DOI: 10.1039/D0NA00297F

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