Journal
ADVANCED SCIENCE
Volume 6, Issue 8, Pages -Publisher
WILEY
DOI: 10.1002/advs.201802002
Keywords
hierarchical micro-nano sheet arrays; high rate capability; nickel-cobalt double hydroxides; Ni-Zn batteries
Categories
Funding
- Singapore Ministry of Education [R284-000-146-112]
- Zhejiang Provincial Key Research AMP
- Development Project [2019C02037]
- National Natural Science Foundation of China [51403190, 21561012]
- Fundamental Research Funds for the Central Universities
- Young Talent Cultivation Project of Zhejiang Association for Science and Technology [2016YCGC019]
- State Scholarship Fund of China Scholarship Council (CSC) [201708330113]
- Youth Top-notch Talent Development and Training Program Foundation of Zhejiang AF University
- 151 Talent Project of Zhejiang Province
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The rational design of nickel-based cathodes with highly ordered micro-nano hierarchical architectures by a facile process is fantastic but challenging to achieve for high-capacity and high-rate Ni-Zn batteries. Herein, a one-step etching-deposition-growth process is demonstrated to prepare hierarchical micro-nano sheet arrays for Ni-Zn batteries with outstanding performance and high rate. The fabrication process is conducted at room temperature without any need of heating and stirring, and the as-grown nickel-cobalt double hydroxide (NiCo-DH) supported on conductive nickel substrate is endowed with a unique 3D hierarchical architecture of micro-nano sheet arrays, which empower the effective exposure of active materials, easy electrolyte access, fast ion diffusion, and rapid electron transfer. Benefiting from these merits in combination, the NiCo-DH electrode delivers a high specific capacity of 303.6 mAh g(-1) and outstanding rate performance (80% retention after 20-fold current increase), which outperforms the electrodes made of single Ni(OH)(2) and Co(OH)(2) , and other similar materials. The NiCo-DH electrode, when employed as the cathode for a Ni-Zn battery, demonstrates a high specific capacity of 329 mAh g(-1) . Moreover, the NiCo-DH//Zn battery also exhibits high electrochemical energy conversion efficiency, excellent rate capability (62% retention after 30-fold current increase), ultrafast charge characteristics, and strong tolerance to the high-speed conversion reaction.
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