Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 17, Pages 14716-14726Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b01888
Keywords
CoSe2/C; Co-O-C bond; sodium-ion batteries; ultralong cycling stability; kinetics behaviors
Funding
- National Key Research and Development Program of China [2017YFB0102000]
- National Natural Science Foundation of China [51622406, 21673298, 21473258]
- National Postdoctoral Program for Innovative Talents [BX00192]
- China Postdoctoral Science Foundation [2017M6203552]
- Young Elite Scientists Sponsorship Program by CAST [2017QNRC001]
- Innovation Mover Program of Central South University [2017CX004, 2018CX005]
- Hunan Provincial Science and Technology Plan [2017TP1001]
- Provincial Natural Science Foundation of Hunan [2016TP1009]
- Hunan Provincial Natural Science Foundation of China [2018JJ3633]
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Sodium-ion batteries (SIBs), as the promising commercial energy system, are restricted by their sluggish kinetics and low sodium-ion storage. Metal selenide possesses good conductivity and capacity but still suffers from the stacked problem and volume expansion. Significantly, CoSe2/C is successfully prepared with the assistance of citric acid as both a chelating agent and carbon precursor, displaying that cobblestone-like nanospheres with the radii (<25 nm) distribute uniformly in the carbon matrix. It is expected that the established Co-O-C bonds enhance the stability of the structure with faster ion shuttling. With the available electrolyte (NaCF3SO3/diethylene glycol dimethyl ether) in a potential window range from 0.5 to 3.0 V, the as-obtained sample shows the ultralong lifespan at 4.S A g(-1), retaining a capacity of 345 mA h g(-1) after 10 000 cycles. From the detailed kinetic analysis, it is clear that the surface controlled electrochemical behavior mainly contributes to the excellent large-current cycling stability and Na storage capacity. The ex situ results support that the crystal and morphological structure remains stable. This work is anticipated to enhance the in-depth understanding of the CoSe2/C anode and supply a facile manner to obtain electrode materials for SIBs.
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