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Issue 12, 2016
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To enhance the capacity of Li-rich layered oxides by surface modification with metal–organic frameworks (MOFs) as cathodes for advanced lithium-ion batteries

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Abstract

Li-rich layered oxides with a large discharge capacity have attracted considerable attention as cathodes for high energy lithium-ion batteries. To further enhance the discharge capacity and thermal stability of these Li-rich layered oxides, Mn-based metal–organic frameworks (MOFs) with high surface areas, large pore sizes, and stable architectures are employed as the active coating material. Herein, Mn-based MOFs can partially absorb or store oxygen gas originating from the oxidation of oxygen anions from the host lattice of Li-rich layered oxides in the initial charging stage to above 4.5 V (vs. Li/Li+). Moreover, the structure of the Li-rich layered oxide could be strengthened by the interconnection frameworks between the metal cations and organic ligands. As expected, the Li-rich layered Li(Li0.17Ni0.20Co0.05Mn0.58)O2 oxide modified with a MOF exhibits a large discharge capacity (323.8 mA h g−1 at 0.1C rate), high initial coulombic efficiency (91.1%), and good thermal stability without harming the cycle stability and high-rate capability. Surface modification with MOFs offers a new insight for further enhancing the discharge capacity of Li-rich layered oxides as cathodes for advanced lithium-ion batteries.

Graphical abstract: To enhance the capacity of Li-rich layered oxides by surface modification with metal–organic frameworks (MOFs) as cathodes for advanced lithium-ion batteries

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Publication details

The article was received on 29 Jan 2016, accepted on 25 Feb 2016 and first published on 25 Feb 2016


Article type: Paper
DOI: 10.1039/C6TA00882H
J. Mater. Chem. A, 2016,4, 4440-4447

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    To enhance the capacity of Li-rich layered oxides by surface modification with metal–organic frameworks (MOFs) as cathodes for advanced lithium-ion batteries

    Q. Qiao, G. Li, Y. Wang and X. Gao, J. Mater. Chem. A, 2016, 4, 4440
    DOI: 10.1039/C6TA00882H

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