CUED Publications database

Carbon nanohorns/nanotubes: An effective binary conductive additive in the cathode of high energy-density zinc-ion rechargeable batteries

Huang, Y and Li, Z and Jin, S and Zhang, S and Wang, H and Hiralal, P and Amaratunga, GAJ and Zhou, H (2020) Carbon nanohorns/nanotubes: An effective binary conductive additive in the cathode of high energy-density zinc-ion rechargeable batteries. Carbon, 167. pp. 431-438. ISSN 0008-6223

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Abstract

Manganese oxide (MnO ) is proven to be an efficient cathode material in zinc-ion batteries (ZIBs). However, its poor electronic conductivity strongly limits the performance of Zn–MnO batteries. In order to improve performance beyond typical graphitic carbon additives, a binary conductive additive, a combination of carbon nanohorns (CNHs) and carbon nanotubes (CNTs), is added into the MnO electrode to establish high-speed electron-channels in the CNTs/CNHs network with an efficient “line-to-surface-to-point” microstructure. In this electrode, the high aspect-ratio CNTs create a conducting highway for the collected charges, while the CNHs provide extra surface area for electron transfer. Moreover, the specific surface area of the electrode increases due to the introduction of CNHs, which increases the Zn diffusion coefficient. As a result, the corresponding battery reaches a high specific capacity (343 mAh g at 0.3 A g ), excellent rate performance (191.3 mAh g at 3 A g ) and long-life cycle. Moreover, it achieves an admirable specific energy density of 466 W h kg , together with a peak power density of 9.4 kW kg (normalized to the weight of MnO ), the performance of which is among the best reported ZIBs. This work reveals new pathways to improve the performance of MnO cathodes for ZIBs. 2 2 2 2 2 2+ −1 −1 −1 −1 −1 −1

Item Type: Article
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Cron Job
Date Deposited: 23 Jul 2020 08:15
Last Modified: 15 Apr 2021 07:12
DOI: 10.1016/j.carbon.2020.05.056