Zheng Jun, Zhan Chenyang, Zhang Kai, Fu Wenwu, Nie Qiaojun, Zhang Ming, Shen Zhongrong
CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, P. R. China.
Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, 361021, P. R. China.
ChemSusChem. 2022 Apr 22;15(8):e202200075. doi: 10.1002/cssc.202200075. Epub 2022 Mar 23.
Aqueous Zn-ion batteries (ZIBs), with the advantages of low cost, high safety, and high capacity, have great potential for application in grid energy storage and wearable flexible devices. However, their commercial application is still restricted by their inferior long-term cycling stability, Zn dendrite formation, and the decomposition of aqueous electrolyte. In this study, a Zn|Zn(CF SO ) +LiTFSI|V O @C cell is constructed to address the above issues. The V O @C electrode can be fully oxidized into amorphous V O @C simultaneously with Zn and H O co-insertion. The cell delivers a high specific capacity of more than 240 mAh g at 3 A g , with extraordinary coulombic efficiency and capacity retention. The excellent electrochemical performances are attributed to synergistic effects between the V O @C electrode and the water-in-salt electrolyte with enhanced stability and improved interface reaction kinetics. Systematic improvements of this architecture indicate much promise for application.
水系锌离子电池（ZIBs）具有成本低、安全性高和容量大等优点，在电网储能和可穿戴柔性设备中具有巨大的应用潜力。然而，其商业应用仍受到长期循环稳定性差、锌枝晶形成以及水系电解质分解的限制。在本研究中，构建了Zn|Zn(CF₃SO₃)₂+LiTFSI|V₂O₅@C电池以解决上述问题。V₂O₅@C电极可在锌和水共嵌入的同时完全氧化为非晶态V₂O₅@C。该电池在3 A g⁻¹时具有超过240 mAh g⁻¹的高比容量，具有出色的库仑效率和容量保持率。优异的电化学性能归因于V₂O₅@C电极与盐水电解质之间的协同效应，稳定性增强且界面反应动力学得到改善。这种结构的系统改进显示出很大的应用前景。
