Method for increasing solid content of Prussian blue and derivative thereof and sodium ion battery

Abstract

The invention relates to the technical field of sodium ion batteries, in particular to a method for increasing the solid content of Prussian blue and a derivative thereof and a sodium ion battery. The invention provides the method for increasing the solid content of Prussian blue and the derivative thereof, the method comprises the following steps: adding solid-phase potassium ferrocyanide and solid-phase soluble metal salt into a base solution for reaction to obtain a reaction solution containing Prussian blue and derivatives thereof, wherein the base solution is a solution containing soluble sulfate and / or chlorate. According to the method provided by the invention, the solid content of the reaction liquid containing the Prussian blue and the derivatives thereof can reach 50%, the generation of industrial wastewater is greatly reduced, and the method is economical and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a method for increasing the solid content of Prussian blue and its derivatives and a sodium ion battery. Background technique [0002] The molecular formula of Prussian blue material is A x m y M'1-y[Fe(CN) 6 ]1-z*nH 2 O, where A is Na or K; M, M' is one or more of Fe, Co, Mn, Ni, Cu; 0≤x≤2, 0<y≤1, 0≤z<1, 0≤ n≤3.5. Prussian blue materials have the characteristics of high specific capacity, high voltage platform, and low cost, and have outstanding advantages in terms of stability and power characteristics; at the same time, Prussian blue materials have a suitable open frame structure, which can provide fast transmission for sodium ions It is an excellent class of cathode materials for sodium-ion batteries. [0003] When the traditional process prepares the Prussian blue material as the positive electrode material of the sodium ion battery, it usually prepa...

AI Technical Summary

Problems solved by technology

Due to the difficulty in controlling the nucleation and crystal growth rate during the preparation process, there are many defects in the product

In order to prepare materials with fewer defects, it is generally necessary to use a low-solubility reaction solution. At the same time, limited by solubility, water is used as a solvent directly. At the end of the reaction, the solid content of the Prussian blue material in the reaction vessel is relatively low, generally around 10%. , producing a large amount of waste water, seriously restricting the capacity and efficiency of the reaction

In addition, the material particles prepared by the traditional process are small, the crystallinity is poor, and the fluidity is not good, resulting in low compaction of the battery pole piece and poor performance.

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