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  • A hollow tubular NiCo layac...
    Xuan, Xiaoyang; Qian, Min; Pan, Likun; Lu, Ting; Gao, Yang; Han, Lu; Wan, Lijia; Niu, Yueping; Gong, Shangqing

    Journal of energy chemistry, July 2022, 2022-07-00, Volume: 70
    Journal Article

    A hollow tubular NiCo LDH@AgNW with improved conductivity and enhanced redox kinetics for high power density Ni//Zn battery. Display omitted Flexible aqueous Ni//Zn batteries have attracted much attention as promising candidates for energy storage in the field of flexible electronics. However, the Ni-based cathodes still face the challenges of poor conductivity, confined charge/mass transfer, and non-flexibility. In this work, we designed a hollow tubular structure consisting of a conductive silver nanowire (AgNW) wrapped by active NiCo layered double hydroxide (LDH), for enhancing the electrical conductivity, improving the charge/mass transfer kinetics, and facilitating the ion penetration. By optimizing the contents of Ni, Co and AgNW, the Ni4Co LDH@Ag1.5NW composite shows a maximum specific capacity of 115.83 mAh g−1 at 0.1 A g−1 measured in a two-electrode system. Highlightingly, the flexible aqueous Ni//Zn battery assembled by Ni4Co LDH@Ag1.5NW interwoven with multi-walled carbon nanotube cathode and Zn foil anode realizes a high power density of 160 μW cm−2 at the energy density of 23.14 μWh cm−2, which is superior compared with those of oxide/hydroxide based devices and even higher than those of many carbon-based supercapacitors, showing its promising potentials for flexible energy storage applications.