Journal
ELECTROCHIMICA ACTA
Volume 306, Issue -, Pages 45-53Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.03.071
Keywords
Silicon-based lithium-ion batteries; Three-dimensional graphene foam; Alloyed Cu/Si nanoflowers; Core-shell structure
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21750110441]
- Suzhou Industrial Park Initiative Platform Development for Suzhou Municipal Key Lab for New Energy Technology [RR0140]
- Key Program Special Fund in XJTLU [KSF-A-04]
- EPSRC [EP/K018930/1] Funding Source: UKRI
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In this study, we demonstrate a facile method to fabricate a flexible alloyed copper/silicon core-shell nanoflowers structure anchored on the three-dimensional graphene foam as a current collector. This combination provides flexible and free-standing structure and three-dimensional conductive network, allowing unique properties for current collection and transmission. The copper oxide nanoflowers are synthesized on the three-dimensional graphene foam by a simple electrodeposition and etching, which serves as an outstanding template to retard the stress effects during the lithiation/delithiation of silicon. After the silicon coating uniformly deposited on the copper oxide nanoflowers, a simple hydrogen annealing was applied to reduce copper oxide nanoflowers and form the copper/silicon alloy, remarkably enhancing the conductivity of silicon. Moreover, this structure can be directly assembled without any conductive additive or binder. In electrochemical testing, the resulting copper/silicon core-shell nanoflowered electrode demonstrates a high initial capacity of 1869 mAh g(-1) at 1.6 A g(-1), with a high retention rate of 66.6% after 500 cycles. More importantly, at a high current density of 10 A g(-1), this anode still remains a high capacity retention >63% (compared with the highest capacity 679 mAh g(-1)), offering enormous potential for energy storage applications. (c) 2019 Elsevier Ltd. All rights reserved.
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