In situ construction of heterostructured bimetallic sulfide/phosphide with rich interfaces for high-performance aqueous Zn-ion batteries  

原位构筑富异质结界面的双金属硫/磷化合物提升水系锌电池性能

作　　者：Fang Yang Yuenian Shen Ze Cen Jie Wan Shijie Li Guanjie He Junqing Hu Kaibing Xu 杨方;沈越年;岑泽;万杰;李世杰;何冠杰;胡俊青;徐开兵(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Research Center for Analysis and Measurement&College of Materials Science and Engineering,Donghua University,Shanghai 201620,China;Institute of Innovation&Application,National Engineering Research Center for Marine Aquaculture,Zhejiang Ocean University,Zhoushan 316022,China;School of Chemistry,University of Lincoln,Brayford Pool,Lincoln LN67TS,UK;College of Health Science and Environmental Engineering,Shenzhen Technology University,Shenzhen 518118,China)

机构地区：[1]School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China [2]State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Research Center for Analysis and Measurement&College of Materials Science and Engineering,Donghua University,Shanghai 201620,China [3]Institute of Innovation&Application,National Engineering Research Center for Marine Aquaculture,Zhejiang Ocean University,Zhoushan 316022,China [4]School of Chemistry,University of Lincoln,Brayford Pool,Lincoln LN67TS,UK [5]College of Health Science and Environmental Engineering,Shenzhen Technology University,Shenzhen 518118,China

出　　处：《Science China Materials》2022年第2期356-363,共8页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(51602049 and 51708504);China Postdoctoral Science Foundation(2017M610217 and 2018T110322)。

摘　　要：It is still challenging to develop suitable cathode structures for high-rate and stable aqueous Zn-ion batteries.Herein,a phosphating-assisted interfacial engineering strategy is designed for the controllable conversion of NiCo_(2)S_(4) nanosheets into heterostructured NiCoP/NiCo_(2)S_(4) as the cathodes in aqueous Zn-ion batteries.The multicomponent heterostructures with rich interfaces can not only improve the electrical conductivity but also enhance the diffusion pathways for Zn-ion storage.As expected,the NiCoP/NiCo_(2)S_(4) electrode has high performance with a large specific capacity of 251.1 mA h g^(−1) at a high current density of 10 A g^(−1) and excellent rate capability(retaining about 76%even at 50 A g^(−1)).Accordingly,the Zn-ion battery using NiCoP/NiCo_(2)S_(4) as the cathode delivers a high specific capacity(265.1 mA h g^(−1) at 5 A g^(−1)),a long-term cycling stability(96.9%retention after 5000 cycles),and a competitive energy density(444.7W h kg^(−1) at the power density of 8.4 kW kg^(−1)).This work therefore provides a simple phosphating-assisted interfacial engineering strategy to construct heterostructured electrode materials with rich interfaces for the development of high-performance energy storage devices in the future.目前开发高倍率和稳定的水系锌离子电池电极材料仍然是一个挑战.本研究提出了一种磷化辅助界面工程策略,将NiCo_(2)S_(4)纳米片可控转化为NiCoP/NiCo_(2)S_(4)异质结构作为水系锌离子电池电极材料.具有丰富界面的多组分异质结构不仅提高了电极材料的电导率,而且增强了锌离子的扩散路径.和预期结果一样,NiCoP/NiCo_(2)S_(4)电极材料在10 A g^(−1)的电流密度下其容量高达251.1 mA h g^(−1),且具有优异的倍率性能(电流密度高达50 A g^(−1)时,其容量保持约为76%).此外,以NiCoP/NiCo_(2)S_(4)为正极组装的锌离子电池也展现了优异的比容量(在5 A g^(−1)的电流密度下高达265.1 mA h g^(−1)),长循环稳定性(经过5000圈循环后比容量保持率为96.9%)和高能量密度(在8.4 kW kg^(−1)的功率密度下高达444.7 W h kg^(−1)).因此,本研究为构建具有丰富界面的异质结电极材料提供了一种简单的磷化辅助界面工程策略,为未来开发高性能储能器件提供了理论基础.

关 键 词：PHOSPHATING HETEROSTRUCTURE NiCoP/NiCo2S4 Znion batteries high capacity 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]