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Issue 8, 2020
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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., 2020,2, 3222-3230
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, 2, 3222 DOI: 10.1039/D0NA00297F

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