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- Title
Facile Fabrication of Co<sub>9</sub>S<sub>8</sub> Embedded in a Boron and Nitrogen Co‐Doped Carbon Matrix as Sodium‐Ion Battery Anode.
- Authors
Zhang, Tianwei; Qu, Hong; Sun, Kuangzheng; Li, Shaochun
- Abstract
A unique composite (Co9S8@BNC) consisting of cobalt sulfide (Co9S8) embedded in a boron and nitrogen co‐doped carbon matrix (BNC) is successfully synthesized as anode material for sodium‐ion batteries (SIBs). The BNC matrix was demonstrated to improve the electronic and ion diffusion speed, as well as help buffer the dramatic volumetric expansion during the repeated cycling processes. Benefited from the advantages of BNC matrix, Co9S8@BNC delivered a high initial reversible capacity of 494 mAh ⋅ g−1 at 100 mA ⋅ g−1 and could remain 388 mAh ⋅ g−1 after 100 cycles. Apart from that, it exhibited an excellent rate performance (258 mAh ⋅ g−1 at the current density of 2 A ⋅ g−1) and was demonstrated as pseudocapacitive charge storage. As a consequence, the as‐prepared Co9S8@BNC possesses an exceptional electrochemical performance and could be utilized as a potential anode material candidate for SIBs. A composite of cobalt sulfide embedded in a B, N co‐doped carbon matrix (Co9S8@BNC) is synthesized as anode material for sodium‐ion batteries. The BNC matrix improves the electronic and ion diffusion speed and buffers the dramatic volumetric expansion during battery cycling. Co9S8@BNC thus delivers a high reversible capacity, stable cycling behavior and excellent rate performance.
- Subjects
COBALT spectra; BORON spectra; NITROGEN spectra; LITHIUM-ion batteries; ANODES
- Publication
ChemElectroChem, 2019, Vol 6, Issue 6, p1776
- ISSN
2196-0216
- Publication type
Article
- DOI
10.1002/celc.201801843