4.6 Article

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

Journal

JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 8, Pages 3933-3940

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta10114k

Keywords

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Funding

  1. Academy of Sciences large apparatus United Fund of China [U1832187]
  2. National Nature Science Foundation of China [21471091]
  3. Guangdong Province Science and Technology Plan Project for Public Welfare Fund and Ability Construction Project [2017A010104003]
  4. Shenzhen Science and Technology Research and Development Funds [JCYJ20170818104441521]
  5. Fundamental Research Funds of Shandong University [2018JC022]
  6. Taishan Scholar Project of Shandong Province [ts201511004]

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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.

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