Interlayer Modification of Pseudocapacitive Vanadium Oxide and Zn(H2O)n2+ Migration Regulation for Ultrahigh Rate and Durable Aqueous Zinc‐Ion Batteries

Advanced Science

Lei Song¹  Shulai Lei²  Hangda Chen³  Shanglong Peng³  Li Liu³  Yanan Zhang³  Juanjuan Huang³  Shuhao Tian³  Xiaogang Wu³  Yanpeng Liu³  Tianfeng Qin³ 

[1] Department of Applied Physics Eindhoven University of Technology Eindhoven 5600 MB the Netherlands;Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science Xiangyang Hubei 441053 China;National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology School of Physical Science and Technology Lanzhou University Lanzhou 730000 P.R. China;

关键词: aqueous zinc‐ion batteries;    high‐rate performance;    hydrated vanadium oxide;    hydrated zinc‐ion;    pseudocapacitance;   

DOI  :  10.1002/advs.202004924

来源: DOAJ

【 摘 要 】

Abstract The interlayer modification and the intercalation pseudocapacitance have been combined in vanadium oxide electrode for aqueous zinc‐ion batteries. Intercalation pseudocapacitive hydrated vanadium oxide Mn1.4V10O24·12H2O with defective crystal structure, interlayer water, and large interlayer distance has been prepared by a spontaneous chemical synthesis method. The inserted Mn2+ forms coordination bonds with the oxygen of the host material and strengthens the interaction between the layers, preventing damage to the structure. Combined with the experimental data and DFT calculation, it is found that Mn2+ refines the structure stability, adjusts the electronic structure, and improves the conductivity of hydrated vanadium oxide. Also, Mn2+ changes the migration path of Zn2+, reduces the migration barrier, and improves the rate performance. Therefore, Mn2+‐inserted hydrated vanadium oxide electrode delivers a high specific capacity of 456 mAh g−1 at 0.2 A g–1, 173 mAh g–1 at 40 A g–1, and a capacity retention of 80% over 5000 cycles at 10 A g–1. Furthermore, based on the calculated zinc ion mobility coefficient and Zn(H2O)n2+ diffusion energy barrier, the possible migration behavior of Zn(H2O)n2+ in vanadium oxide electrode has also been speculated, which will provide a new reference for understanding the migration behavior of hydrated zinc‐ion.

【 授权许可】

Unknown