In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 9, No. 43 ( 2021), p. 24548-24559
Abstract:
Developing novel composite materials with delicate micro or nanoscale structures that enable fast lithium transport is crucial for high performance anode materials for lithium batteries. Herein, we developed a novel template-free synthesis method for a Co-based metal composite (amCoC) with a unique open yolk–shell structure, which uses an ionic liquid (IL) as a new structure-directing agent. Subsequently, the amCoC can be converted into a Co 3 O 4 /nitrogen-doped carbon composite (Co 3 O 4 /NDC) by thermal treatment. The morphology and phase transformation processes were investigated by in situ transmission electron microscopy ( in situ TEM). Atomic scale probe aberration-corrected STEM confirms that the cobalt content in the open yolk–shell Co 3 O 4 /NDC is in the form of spinel Co 3 O 4 . Density functional theory calculations indicate that the carbon can optimize the band structure and improve the lithium ion diffusion ability. When applied in lithium ion batteries, the open yolk–shell Co 3 O 4 /NDC shows excellent electrochemical performance with a reversible capacity of 1220 mA h g −1 at 0.5C after 100 cycles. This template-free synthesis method for yolk–shell Co 3 O 4 /NDC microstructures paves new paths for design of high performance energy storage materials.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
2702232-8
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