Liu, Chenguang, Zhao, Yinchao, Yi, Ruowei, Sun, Yi, Li, Yinqing, Yang, Li, Mitrovic, Ivona ORCID: 0000-0003-4816-8905, Taylor, Stephen ORCID: 0000-0002-2144-8459, Chalker, Paul ORCID: 0000-0002-2295-6332 and Zhao, Cezhou
(2019)
Alloyed Cu/Si core-shell nanoflowers on the three-dimensional graphene foam as an anode for lithium-ion batteries.
ELECTROCHIMICA ACTA, 306.
pp. 45-53.
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Abstract
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.
Item Type: | Article |
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Uncontrolled Keywords: | Silicon-based lithium-ion batteries, Three-dimensional graphene foam, Alloyed Cu/Si nanoflowers, Core-shell structure |
Depositing User: | Symplectic Admin |
Date Deposited: | 27 Mar 2019 08:17 |
Last Modified: | 19 Jan 2023 00:56 |
DOI: | 10.1016/j.electacta.2019.03.071 |
Related URLs: | |
URI: | https://livrepository.liverpool.ac.uk/id/eprint/3035021 |