Alloyed Cu/Si core-shell nanoflowers on the three-dimensional graphene foam as an anode for lithium-ion batteries

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
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:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3035021