Dual Carbon Design Strategy for Anodes of Sodium-Ion Battery: Mesoporous CoS2/CoO on Open Framework Carbon-Spheres with rGO Encapsulating

Sui, Ran, Zan, Guangtao, Wen, Ming, Li, Weina, Liu, Zihui, Wu, Qingsheng and Fu, Yong Qing (2022) Dual Carbon Design Strategy for Anodes of Sodium-Ion Battery: Mesoporous CoS2/CoO on Open Framework Carbon-Spheres with rGO Encapsulating. ACS Applied Materials & Interfaces, 14 (24). pp. 28004-28013. ISSN 1944-8244

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Official URL: https://doi.org/10.1021/acsami.2c06551


Transition metal sulfides and oxides with high theoretical capacities have been regarded as promising anode candidates for a sodium-ion battery (SIB); however, they have critical issues including sluggish electrochemical kinetics and poor long-term stability. Herein, a dual carbon design strategy is proposed to integrate with highly active heterojunctions to overcome the above issues. In this new design, CoS2/CoO hollow dodecahedron heterojunctions are sandwiched between open framework carbon-spheres (OFCs) and a reduced graphene oxide (rGO) nanomembrane (OFC@CoS2/CoO@rGO). The CoS2/CoO heterojunctions effectively promote electron transfer on their surface and provide more electrochemical active sites through their hierarchical hollow structures assembled by nanodots. Meanwhile, the dual-carbon framework forms a highly conductive network that enables a better rate capability. More importantly, the dual carbon can greatly buffer volume expansion and stable reaction interfaces of electrode material during the charge/discharge process. Benefitting from their synergistical effects, the OFC@CoS2/CoO@rGO electrode achieves a high reversible capacity of 460 mAh g–1 at 0.05 A g–1 and still maintains 205.3 mAh g–1 even when current density is increased by 200 times when used as an anode material for SIBs. Their cycling property is also remarkable with a maintained capacity of 161 mAh g–1 after 3500 charging/discharging cycles at a high current density of 1 A g–1. The dual-carbon strategy is demonstrated to be effective for enhanced reaction kinetics and long-term cycling property, providing siginificant guidance for preparing other high-performance electrode materials.

Item Type: Article
Additional Information: Funding information: This work was financially supported by the National Natural Science Foundation (NSFC Nos: 22171212), Science and Technology Committee of Shanghai Municipality (21160710300, 19DZ2271500) by China, International Exchange Grant (IEC/NSFC/201078) through Royal Society UK and NSFC.
Uncontrolled Keywords: CoS2 CoO open framework carbon-sphere graphene heterojunctions dual carbon strategy anode sodium-ion battery
Subjects: F200 Materials Science
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 22 Jun 2022 08:11
Last Modified: 10 Jun 2023 08:00
URI: https://nrl.northumbria.ac.uk/id/eprint/49390

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