摘要
The enhancement of energy density and cycling stability is in urgent need for the widespread applications of aqueous rechargeable Ni-Zn batteries.Herein,a facile strategy has been employed to construct hierarchical Co-doped NiMoO4nanosheets as the cathode for high-performance Ni-Zn battery.Benefiting from the merits of substantially improved electrical conductivity and increased concentration of oxygen vacancies,the NiMoO4with 15%cobalt doping(denoted as CNMO-15)displays the best capacity of 361.4 m A h g-1at a current density of 3 A g-1and excellent cycle stability.Moreover,the assembled CNMO-15//Zn battery delivers a satisfactory specific capacity of 270.9 mA h g-1at 2 A g-1and a remarkable energy density of 474.1 W h kg-1at 3.5 kW kg-1,together with a maximum power density of 10.3 kW kg-1achieved at 118.8 W h kg-1.Noticeably,there is no capacity decay with a 119.8%retention observed after 5000 cycles,demonstrating its outstanding long lifespan.This work might provide valuable inspirations for the fabrication of high-performance Ni-Zn batteries with superior energy density and impressive stability.
提高能量密度和循环稳定性对推广水系可充电镍锌电池的广泛应用至关重要.我们采用一种简易的合成方法构建了Co掺杂NiMoO4纳米片,并将其作为正极材料用于高性能镍锌电池.得益于导电性和氧空位浓度的大幅度提升,钴掺杂量为15%的电极材料(CNMO-15)表现出突出的比容量及循环稳定性,在3 A g-1的电流密度下其容量高达361.4 mA h g-1.此外,以CNMO-15为正极组装的镍锌电池(CNMO-15//Zn)也展现了优异的比容量(在2 A g-1的电流密度下高达270.9 mA h g-1),以及高能量密度(在3.5 kW kg-1的功率密度下高达474.1 W h kg-1)和功率密度(在118.8 W h kg-1的能量密度下高达10.3 kW kg-1).值得注意的是,该电池在循环5000圈后容量没有损失,保留了初始容量的119.8%,表现出优异的循环稳定性.本研究可以为未来构建高能量密度和优异循环稳定性的镍锌电池提供非常有价值的参考.
作者
Yuenian Shen
Ke Zhang
Fang Yang
Zhihao Li
Zhe Cui
Rujia Zou
Qian Liu
Junqing Hu
Kaibing Xu
沈越年;张可;杨方;李志豪;崔哲;邹儒佳;刘倩;胡俊青;徐开兵(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China;Research Center for Analysis and Measurement,Donghua University,Shanghai 201620,China;Department of Applied Physics,Donghua University,Shanghai 201620,China;College of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;College of Health Science and Environmental Engineering,Shenzhen Technology University,Shenzhen 518118,China)
基金
financially supported by the National Natural Science Foundation of China(51602049)
the Fundamental Research Funds for the Central Universities(2232017D-15,GSIF-DH-M-2020002)
China Postdoctoral Science Foundation(2017M610217 and 2018T110322)。
