Preparation and the diffusion kinetic investigation of Zn3(OH)2V2O7·2H2O nanosheets anode for high performance lithium-ion battery

In this paper, two dimensional nanosheet (2D) Zn₃(OH)₂V₂O₇·2H₂O has been synthesized by a facile hydrothermal method. The structure and morphology evolution of the resulting material are characterized by several technologies. Applied for anode of lithium-half cell, the as-synthesized sample delivers a high reversible capacity, long-cycling stability, and good rate capability due to intrinsically great area and the short diffusion distance. Notably, according to the equivalent electrical circuit and the non-linear least square regression method, the in-situ electrochemical impedance spectra during the initial discharge–charge cycle are simulated, which indicates that the kinetics property changes significantly when discharged to 0.5 V, and then keeps stability.