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Facile Fabrication of CuS micro-flower as High Durable Sodium-ion battery Anode


Sodium ion batteries (SIBs) have been considered as the promising substitution for the lithium ion batteries (LIBs) due to the abundant resource of sodium. Metal sulfides have been demonstrated as a prospective anode materials for SIBs based on a conversion mechanism. However, the insufficient ionic transportation and low conductivity in discharge electrode prohibit their practival applications. Herein, a new micro-flower CuS, have been prepared by a facile dealloying method and applied as anode for SIBs. The micro-flowers are composed of nanosheets, which can provide more Na+ diffusion admittances and more inter-space to accommodate volumetric change. When applied as anode in SIBs, it delivered the highest discharge capacity (325.6 mAh g-1 at 0.1 A g-1) and excellent rate performance. It also displayed a ultra-stable cycle performance and almost no capacity decay even after 5000 cycles (at a current density of 5 A g-1). Ex-situ XRD has been carried out to disclose the sodium ions storage mechanism. It first experienced an intercalation and then conversion mechanisms with the successive sodiation process, while vice versa for the charging process. The superior electrochemical performance is associated with the nano-micro structure and the controlled reaction mechanism. The current work states briefly that the simple and efficient dealloying method will provide more choices for fabrication anodes of SIBs.

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Publication details

The article was received on 07 Feb 2018, accepted on 09 Mar 2018 and first published on 12 Mar 2018

Article type: Research Article
DOI: 10.1039/C8QI00117K
Citation: Inorg. Chem. Front., 2018, Accepted Manuscript
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    Facile Fabrication of CuS micro-flower as High Durable Sodium-ion battery Anode

    C. An, Y. Ni, Z. Wang, X. Li and X. Liu, Inorg. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QI00117K

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