Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 5, Pages 1624-1631Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta07696j
Keywords
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Funding
- Natural Science Fund for Distinguished Young Scholar of Heilongjiang Province [JC2015001]
- Program for New Century Excellent Talent at Heilongjiang Provincial University [1253-NCET-012]
- Natural Science Foundation of Heilongjiang Province [QC2013C008]
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The tailoring of materials into bio-inspired structures is triggering unprecedented innovations. Muscle tissue is composed of myofibrils and densely wired blood vessels; it is a perfect model for designing high-performance electrode materials that have the advantage of fast mass transport and superior durability. We design a top-down strategy as a facile approach to tailor the alluaudite Na2+2xFe2-x(SO4)(3) into a muscle-like spindle. A precipitation process is employed to prepare the hydrated top precursor, which is subjected to dehydration and phase transformation to obtain the down product. The alluaudite sulfate nanoparticles closely anchor on the single-wall carbon nanotubes (SWNT), and they together aggregate into microscale particles in the shape of spindles. The Na2+2xFe2-x(SO4)(3)/SWNT composite as a whole copies the morphology and function of muscle tissue. Taking advantage of its 3D conductive framework and porous structure, the composite achieves fast electron/ion transport and sodium intercalation. Moreover, the single-phase reaction mechanism during sodium intercalation is beneficial to its cycling property. It exhibits such desirable electrochemical performance as an operating potential as high as similar to 3.8 V and a high-rate capability, which achieves a capacity retention of 92% after 100 cycles at 5C. The muscle-inspired architecture makes electrode materials favorable for superior electrochemical performance.
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