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Template-free synthesis of hollow Li2O–Fe2O3–Ag heterostructures for ultra-high performance Li-ion batteries

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Abstract

A carbon-free, three-dimensional hollow hybrid structure has been synthesized by a facile template free hydrothermal method and used as an ultra-high performance Li-ion battery anode. The heterostructure is composed of Fe2O3, Li2O and Ag, where the high theoretical capacity of Fe2O3 has been fully exploited by incorporating Ag and Li2O into the system. This strategy allows a strong synergistic effect leading to high reversible capacity, exceptional cycling stability and excellent rate capability. The addition of Li2O enhances the electrochemical performance of Fe2O3 by prohibiting its agglomeration. It further acts as an oxidant facilitating the recovery of Fe to Fe2O3 during the charge step and as a buffer matrix which effectively cushions the volumetric stresses generated during cycling. The addition of Ag aids in suppressing the irreversible capacity loss, improves the electrical conductivity and adds to the capacity via Li alloying. This smart hybrid composition coupled with a special hollow structure allows the heterostructure to deliver high initial coulombic efficiency (∼86%) and high reversible capacity (∼1350 mA h g−1 at 100 mA g−1) with almost no capacity fading. Furthermore it demonstrates an excellent rate performance delivering capacities of ∼950, 780 and 610 mA h g−1 at high current rates of 0.5, 1 and 2 A g−1.

Graphical abstract: Template-free synthesis of hollow Li2O–Fe2O3–Ag heterostructures for ultra-high performance Li-ion batteries

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Publication details

The article was received on 26 Feb 2017, accepted on 31 May 2017 and first published on 31 May 2017


Article type: Paper
DOI: 10.1039/C7TA01766A
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Template-free synthesis of hollow Li2O–Fe2O3–Ag heterostructures for ultra-high performance Li-ion batteries

    Shilpa and A. Sharma, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA01766A

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