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Hierarchical CuO Octahedra Inherited from Copper Metal-Organic Frameworks: High-Rate and High-Capacity Lithium-Ion Storage Materials Stimulated by Pseudocapacitance

Abstract

Controllable synthesis and structure tailoring of metal oxide electrode for high rate ability and stability still remain the formidable challenge. In this paper, a room-temperature solid-solid transformation route was introduced for the fabrication of hierarchically-structured porous CuO octahedron (HPCO) electrode, by treating a copper metal-organic framework template Cu-BTC with alkali solution. The HPCOs greatly inherit the morphology and size of precursor Cu-BTC, and they are constructed by assembly of many ultrathin nanosheets with average lateral sizes of ca. 250 nm. When serving as the host for Li+ storage, the as-fabricated HPCOs exhibits an unprecedented performance benefiting from its advantageous structural features, with an ultra-high capacity of 1201 mA h g-1, and superb high-rate performance with excellent cycling stability (1062, 615, 423 mA h g-1 at 0.5, 2, and 5 A g-1, after repetitive 200, 400, and 400 cycles, respectively). It is noteworthy that the surface redox pseudocapacitive effect contributes significantly to the high capacity and high rate of Li-ion storage in HPCO electrode. This encouraging result may accelerate the further development of LIBs by smart micro-/nanoengineering strategy of the metal oxide-based electrode materials.

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Publication details

The article was received on 05 Apr 2017, accepted on 17 May 2017 and first published on 18 May 2017


Article type: Paper
DOI: 10.1039/C7TA02953E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Hierarchical CuO Octahedra Inherited from Copper Metal-Organic Frameworks: High-Rate and High-Capacity Lithium-Ion Storage Materials Stimulated by Pseudocapacitance

    X. Hu, C. Li, X. Lou, Q. Yang and B. Hu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02953E

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