Nitrogen-Doped Graphene-Supported Straw-Like CoSe<sub>2</sub> for Rapid and Stable Sodium-Ion Storage.
basic_science · Level V
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- Record sourced from PubMed, PMID 40614228.
- Also identified by DOI 10.1021/acs.nanolett.5c01717.
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Abstract
Cobalt diselenide (CoSe<sub>2</sub>) materials exhibit significant potential in sodium-ion batteries (SIBs) owing to their high theoretical specific capacity and excellent cycling stability. However, the conductivity and volume expansion of CoSe<sub>2</sub> limit its rate performance and cycling stability. Herein, a nitrogen-doped reduced graphene oxide (N-rGO) supported straw-like CoSe<sub>2</sub> anode material (CoSe<sub>2</sub>/N-rGO) is synthesized via a hydrothermal method. Experimental results show that nitrogen doping improves the conductivity and structural stability of CoSe<sub>2</sub>/N-rGO, enabling excellent rate performance (311.75 mAh g<sup>-1</sup> at 10 A g<sup>-1</sup>) and high cycling stability (356.78 mAh g<sup>-1</sup> after 1000 cycles at 1 A g<sup>-1</sup>). Notably, the CoSe<sub>2</sub>/N-rGO||NVP full cell exhibits a capacity of 117.4 mAh g<sup>-1</sup> at 0.1 C, approaching 98.7% of the calculated maximum for NVP (118 mAh g<sup>-1</sup>). This approach offers new insights and valuable guidance for the structure of efficient electrode materials for energy storage systems.