Journal
SCIENCE BULLETIN
Volume 65, Issue 18, Pages 1563-1569Publisher
ELSEVIER
DOI: 10.1016/j.scib.2020.05.018
Keywords
Lithium-ion battery; Silicon anode; Interface stability; In situ TEM; Dense and thick electrodes
Categories
Funding
- National Natural Science Foundation of China [51872195]
- National Science Fund for Distinguished Young Scholars of China [51525204]
- JSPS KAKENHI [20K05281]
- Beijing Natural Science Foundation [2192061]
- Grants-in-Aid for Scientific Research [20K05281] Funding Source: KAKEN
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Increasing the density and thickness of electrodes is required to maximize the volumetric energy density of lithium-ion batteries for practical applications. However, dense and thick electrodes, especially highmass-content (>50 wt%) silicon anodes, have poor mechanical stability due to the presence of a large number of unstable interfaces between the silicon and conducting components during cycling. Here we report a network of mechanically robust carbon cages produced by the capillary shrinkage of graphene hydrogels that can contain the silicon nanoparticles in the cages and stabilize the silicon/carbon interfaces. In situ transmission electron microscope characterizations including compression and tearing of the structure and lithiation-induced silicon expansion experiments, have provided insight into the excellent confinement and buffering ability of this interface-strengthened graphene-caged silicon nanoparticle anode material. Consequently, a dense and thick silicon anode with reduced thickness fluctuations has been shown to deliver both high volumetric (>1000 mAh cm(-3)) and areal (>6 mAh cm(-2)) capacities together with excellent cycling capability. (C) 2020 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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