期刊
ELECTROCHIMICA ACTA
卷 353, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136535
关键词
Microstructure optimization; Cobalt oxide; Zinc batteries; Electrochemical performance
资金
- CAS Pioneer Hundred Talents Program [KJ2090130001]
- USTC Research Funds of the Double First-Class Initiative [YD2090002006]
- Joint Laboratory for USTC [ES2090130110]
- USTC Tang Scholar
- Hong Kong Polytechnic University [G-YW2D]
- Research Grant Council, University Grants Committee, Hong Kong SAR [PolyU 152214/17E, PolyU 152064/18E]
- Yanchang Petroleum [ES2090130110]
The insufficient utilization of active material results in the poor performance of Zn-Co batteries. In this work, by adjusting the key parameters in the synthesis process, the Co3O4 electrodes with different pore size distributions, morphologies, and loadings are fabricated. The effects of the tuned microstructures on three-electrode and battery systems are compared carefully. In this way, a heterogeneous porous nanowire structure with reasonable loading is constructed for the first time, which shows the optimal performance. Particularly, a Zn-Co battery with this electrode exhibits a high capacity of 230.0 mAh g(-1) with a utilization ratio of 51.6% and a decent energy density of 308.8 Wh kg(-1) based on the weight of Co3O4 and Zn plate. Besides, with an increase of the current densities from 0.5 to 10 A g(-1), the capacity drops from 230.0 to 144.0 mAh g(-1) with the capacity retention of only 62.6%. Moreover, the battery can operate 3000 cycles (up to 547 h) with a retention ratio of 66.8%, illustrating excellent stability. This work gives an ultrahigh-capacity Co3O4 electrode benefiting from the novel-designed structure, which dramatically improves the utilization level of the active materials, leading to high and stable battery performance. (C) 2020 Elsevier Ltd. All rights reserved.
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