6 results about "Sodium ferrocyanide" patented technology

A method for preparing a Prussian blue-based sodium-ion battery cathode material with both high capacity and long cycle performance, belonging to the field of sodium-ion batteries, includes the following steps: Step 1, preparing a sodium ferrocyanide solution, denoted as solution A; Step 2, dissolving a transition metal divalent ferric salt, a doped metal salt, ascorbic acid, and a complexing agent in deionized water, denoted as solution B; Step 3, preparing an aqueous solution of the complexing agent, denoted as solution C; Step 4, simultaneously adding solutions A and B in equal molar amounts to solution C for a co-precipitation reaction, aging the solution to obtain a suspension, separating the suspension to obtain the Prussian blue-based sodium-ion battery cathode material with both high capacity and long cycle performance. This invention proposes a synthesis method that only requires co-precipitation through a combination of slow crystallization and ion doping to obtain a low-cost, non-toxic, harmless, simple preparation process, short production cycle, and Prussian blue-based sodium-ion cathode material with both high capacity and long cycle performance.

The application discloses a Prussian blue compound and a preparation method and application thereof, and the preparation method is as follows: (1) uniformly dispersing a carbon source / nitrogen source, an iron salt and a nickel salt in ethanol, drying, and calcining under an inert atmosphere to obtain FeNi@NCT; (2) dispersing the FeNi@NCT in a sodium ferrocyanide aqueous solution, adjusting pH, standing, washing with deionized water, and drying to obtain a Prussian blue compound, and the Prussian blue compound is also called FeNiPBA / NCT. The preparation method is simple, efficient, green, has strong component adjustability, strong process scalability and is easy to enlarge. The Prussian blue compound prepared by the application has high crystallinity and high conductivity, as a positive electrode material, significantly improves the rate performance and cycle life of a sodium ion battery, and the electrochemical performance far exceeds that of a conventional modified strategy for preparing a Prussian blue positive electrode material, and overcomes the technical defects of the Prussian blue positive electrode material in the sodium ion battery.

The application discloses a Prussian blue type positive material and a preparation method and application thereof. The preparation method mainly comprises the following steps: sequentially adding a manganese source, a nickel source, an iron source and a reducing agent into a sodium ferrocyanide solution, and heating to obtain the Prussian blue type positive material; wherein the sodium ferrocyanide solution comprises Na4Fe[CN]6 slow-release tablets and / or Na4Fe[CN]6 capsules. Through tabletting or surface coating of the raw material Na4Fe[CN]6 capsules, and by utilizing the difference in solubility product between manganese, nickel, iron and ferrocyanide, the adding sequence of the reaction raw materials is adjusted, the production efficiency of the Prussian blue type positive material is improved, and the prepared Prussian blue type positive material has excellent electrochemical performance.

The utility model relates to a drying device for sodium ferrocyanide production relates to sodium ferrocyanide production equipment technical field, including: tank body, tank body top is equipped with feeding hopper, and tank body lower part one side is opened has the discharge gate, the feeding hopper is arranged between the discharge gate with the tank body in the tank body, and the spiral structure is arranged, and the vibration subassembly is arranged between the tank body bottom with the feeding hopper, and the hot -blast subassembly is arranged in tank body lower part one side, and the hot -blast subassembly's air outlet end is linked with the tank body inside, the vibration subassembly drives the feeding hopper and vibrates in vertical direction to make sodium ferrocyanide even dry discharge along the track of feeding hopper, and the operation is simple and convenient, can carry out the continuous drying operation to sodium ferrocyanide, and under the action of vibration force still can make sodium ferrocyanide even lay in the feeding hopper and carry out the discharge under the action of vibration force, avoid its occurrence stick and agglomerate, guarantee the drying efficiency and drying quality.

The application discloses an armored vehicle low-temperature sodium ion battery positive electrode material and a preparation method thereof, and particularly relates to the technical field of electrochemistry, and relates to an armored vehicle low-temperature sodium ion battery positive electrode material and a preparation method thereof; the armored vehicle low-temperature sodium ion battery positive electrode material is prepared from ferric chloride hexahydrate, manganese chloride tetrahydrate, sodium ferrocyanide and carboxylated multi-walled carbon nanotubes through co-precipitation synthesis and dehydration, phosphating hydrothermal reaction, carbon nanotube winding and thermal reduction, and surface polymer coating; the manganese iron-based prussian white with an open three-dimensional ion channel is used as an active framework, the intrinsic electronic structure is optimized by using manganese doping, and the content of crystallization water hindering ion migration is effectively controlled by using an accurate low-temperature dehydration process in the synthesis, so that the sodium ion diffusion capacity and charge transfer efficiency of the material in a low-temperature environment are improved.

This invention discloses a graphite-coated Prussian blue and its analogues, their preparation method, and applications, belonging to the field of graphite material preparation technology. The method includes: mixing graphite with one or more of ferric chloride or transition metal chlorides at a mass ratio of 10-0.5, placing the mixture in a reaction apparatus, and purging the apparatus with a protective gas; heating the reaction apparatus to obtain a solid powder; mixing sodium ferrocyanide with the solid powder at a molar mass ratio of 4-1 and adding it to deionized water, with a solid-to-deionized water mass ratio of 1:50-500, and then stirring the reaction for 12-48 hours; filtering the solution after the reaction. This invention uses a protective gas atmosphere to vaporize ferric chloride or transition metal chlorides at high temperature, allowing the ferric chloride or transition metal to be perfectly incorporated into the interlayer spaces of graphite. Then, the sodium ferrocyanide aqueous solution reacts fully with the ferric chloride or transition metal chloride inside the graphite to obtain a graphite structure completely coated with Prussian blue.