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Issue 8, 2019
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Coral-like NixCo1−xSe2 for Na-ion battery with ultralong cycle life and ultrahigh rate capability

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Abstract

Storage technology of electrical energy with ultrafast charge/discharge rates is in high demand for future electronics and electric vehicles. Among them, sodium ion batteries (SIBs) have received much attention, however, the exploration of electrode materials with a high rate capacity and long cycle life still faces great challenges. In this work, we have fabricated coralloid NixCo1−xSe2 with a hierarchical architecture for the first time, and it presents specific capacities of 321 mA h g−1 after 2000 cycles at 2 A g−1, corresponding to a capacity decay rate of 0.011% per-cycle, and 277 mA h g−1 even at the high rate of 15 A g−1, which could be attributed to the enhanced conductivity by Co-doping, the hierarchical architecture preventing the structure from collapsing or crushing, the accelerated electron transmission and the shortened diffusion distance of Na+. The extremely fast electron and Na ion transfer kinetics could be associated with the capacitive contribution. We further reveal the ultrastable and ultrahigh rate Na-ion storage mechanism through systematic analysis including compositional/structure evolution studies and comprehensive electrochemical characterizations. The presented strategy for the design and synthesis of coralloid, Co doped NiSe2 with a hierarchical architecture could enlighten researchers on the development of electrodes with an ultralong cycle life and ultrahigh rate capability.

Graphical abstract: Coral-like NixCo1−xSe2 for Na-ion battery with ultralong cycle life and ultrahigh rate capability

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Article information


Submitted
21 Oct 2018
Accepted
17 Jan 2019
First published
18 Jan 2019

J. Mater. Chem. A, 2019,7, 3933-3940
Article type
Paper

Coral-like NixCo1−xSe2 for Na-ion battery with ultralong cycle life and ultrahigh rate capability

Y. He, M. Luo, C. Dong, X. Ding, C. Yin, A. Nie, Y. Chen, Y. Qian and L. Xu, J. Mater. Chem. A, 2019, 7, 3933
DOI: 10.1039/C8TA10114K

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