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Intrinsic conductivity optimization of bi-metallic nickel cobalt selenides toward superior-rate Na-ion storage
- Source :
- Materials Chemistry Frontiers. 1:2656-2663
- Publication Year :
- 2017
- Publisher :
- Royal Society of Chemistry (RSC), 2017.
-
Abstract
- Enhancing the conductivity of electrode materials is critically important for improving the high-rate performance of Na-ion batteries (NIBs). Herein, we report a multifaceted strategy for optimizing the conductivity and electrochemical properties of nickel cobalt selenides via the combination of fine component regulation and C coating. The electrical conductivity of C@Ni0.33Co0.67Se2/C nanofiber (CNF) (Co0.67) hybrids achieved in this study was 0.3733 S mm−1, a conductivity five-fold higher than that of selenides with a Ni/Co ratio of 2 : 1. Coupled with desirable three-dimensional (3D) nanobrush morphology and the 1D conducting path of CNFs, the Co0.67 electrode achieved a superior rate performance of 413.1 mA h g−1, even at 2 A g−1. Furthermore, the Co0.67 electrode exhibited an impressive cycling performance of 499 mA h g−1 after 100 cycles (exhibiting an 89.5% capacity retention of the second cycle). Finally, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry analysis at different sweep rates were conducted to demonstrate the Co0.67 electrode's fast charge/ion transport ability and increased electrode kinetics.
- Subjects :
- Materials science
Inorganic chemistry
chemistry.chemical_element
02 engineering and technology
Conductivity
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
0104 chemical sciences
Dielectric spectroscopy
Nickel
chemistry
Electrical resistivity and conductivity
Electrode
Materials Chemistry
General Materials Science
Cyclic voltammetry
0210 nano-technology
Cobalt
Subjects
Details
- ISSN :
- 20521537
- Volume :
- 1
- Database :
- OpenAIRE
- Journal :
- Materials Chemistry Frontiers
- Accession number :
- edsair.doi...........7bac4902ec34567af412ca4baf7ce5ec