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

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 NiCo2S4 nanosheets into heterostructured NiCoP/NiCo2S4 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/NiCo2S4 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/NiCo2S4 as the cathode delivers a high specific capacity (265.1 mA h g−1 at 5A g−1), a long-term cycling stability (96.9% retention after 5000 cycles), and a competitive energy density (444.7 W 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.