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A novel calendula-like MnNb2O6 anchored on graphene sheet as high-performance intercalation pseudocapacitive anode for lithium-ion capacitors

Abstract

To balance of electrochemical performance gap between Li+ insertion/deintercalation anode and the anion ions adsorption/desorption cathode, in this paper, we for the first time to investigate the MnNb2O6 as a new rate capability type anode material for lithium-ion capacitors (LICs). A novel calendula-like MnNb2O6 particles anchored on reduced graphene oxide (rGO) was prepared via a simple two-step hydrothermal route. The special three-dimensional structure and cross-linked conductive network constructed by graphene is able to shorten the lithium ion diffusion path and efficiently facilitating electron transmission, as well as adapt to the volume strain without shedding during long-term charge/discharge process, resulting in excellent charge storage capacity and reasonably superior cycling stability. MnNb2O6@rGO//AC LICs assembled with MnNb2O6@rGO as cathode and activated carbon (AC) as anode exhibits excellent performance with maximum energy density of 118 Wh kg-1 and a power density of 8000 W kg-1 based on the total mass loading of active material weight. Note that the initial capacity retention is up to 88% after 10000 charge/discharge cycles, which is higher than that of bimetallic oxide materials reported so far. To the end, this study might provide a novel rate capability anode material for LICs with high performance.

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Publication details

The article was received on 24 Oct 2018, accepted on 08 Jan 2019 and first published on 08 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA10233C
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript
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    A novel calendula-like MnNb2O6 anchored on graphene sheet as high-performance intercalation pseudocapacitive anode for lithium-ion capacitors

    X. Zhang, J. Zhang, S. Kong, K. Zhu, J. Yan, K. Ye, G. Wang, K. Cheng, L. Zhou and D. Cao, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA10233C

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