Journal
MATERIALS CHEMISTRY FRONTIERS
Volume 1, Issue 12, Pages 2656-2663Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7qm00419b
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Funding
- National Natural Science Foundation of China [21373081, 51771236]
- Innovation-Driven Project of Central South University [2017CX002]
- Program for Shenghua Overseas Talents from Central South University
- State Key Laboratory of Powder Metallurgy
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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) (Co-0.67) 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 Co-0.67 electrode achieved a superior rate performance of 413.1 mA h g(-1), even at 2 A g(-1). Furthermore, the Co-0.67 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 Co-0.67 electrode's fast charge/ion transport ability and increased electrode kinetics.
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