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Prussian white composite material as well as preparation method and application thereof

A technology of Prussian white and composite materials, applied in the field of energy storage batteries, can solve problems affecting product structure stability, cycle life electrode processing, affecting rate performance, high-temperature carbon inclusion difficulties, etc., to achieve good ion conductivity and thermal stability Effect

Pending Publication Date: 2022-03-15
SO-FUN TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The synthesis of Prussian white materials is generally carried out in the water phase, and the structure often contains crystal water, which affects the product structure stability, cycle life and electrode processing
In the existing methods, the crystallization water can only be released by baking at high temperature and high vacuum, which not only consumes high energy, but also causes damage to the microstructure of the material.
In addition, the electronic conductivity of Prussian white material is poor, which affects the performance of its rate performance, as well as the processing of thick pole pieces and the corresponding volumetric energy density
In addition, the existence of crystallization water leads to poor thermal stability of Prussian blue materials, which makes it extremely difficult for high-temperature carbon encapsulation
Therefore, the development of Prussian white materials with high electrical conductivity, high thermal stability, and no water of crystallization still faces great challenges

Method used

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  • Prussian white composite material as well as preparation method and application thereof
  • Prussian white composite material as well as preparation method and application thereof
  • Prussian white composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Potassium ferrocyanide trihydrate is dissolved in deionized water to obtain solution I with a concentration of 0.3mol / L, which is potassium ferrocyanide solution; manganese sulfate monohydrate, copper sulfate pentahydrate, and potassium citrate are dissolved in deionized water. Obtain solution A in the water, obtain manganese sulfate monohydrate and copper sulfate pentahydrate total concentration and be solution II (i.e. solution A) of 0.3mol / L, wherein the mol ratio of manganese sulfate monohydrate and copper sulfate pentahydrate is 8.5:1.5, citrate The ratio of the moles of potassium citrate to the total moles of manganese sulfate monohydrate and copper sulfate pentahydrate is 5:1; solution I is mixed with solution II, and a suspension is obtained by coprecipitation at 80°C; Aging at ℃ for 4 hours; finally centrifuged and vacuum-dried at 110℃ to obtain potassium-based Prussian white material; disperse the above-mentioned potassium-based Prussian white material in absol...

Embodiment 2

[0045] Potassium ferrocyanide trihydrate is dissolved in deionized water to obtain solution I with a concentration of 0.5mol / L, which is potassium ferrocyanide solution; manganese sulfate monohydrate, nickel sulfate hexahydrate, and potassium citrate are dissolved in deionized water. In the water, obtain manganese sulfate monohydrate and nickel sulfate hexahydrate total concentration and be solution II (i.e. solution A) of 0.5mol / L, wherein the mol ratio of manganese sulfate monohydrate and nickel sulfate hexahydrate is 8:2, potassium citrate The ratio of the number of moles to the total number of moles of manganese sulfate monohydrate and nickel sulfate hexahydrate is 4:1; solution I is mixed with solution II, and a suspension is obtained by coprecipitation at 80°C; the suspension is aged at 80°C After 4 hours; finally centrifuged and vacuum-dried at 110°C to obtain a potassium-based Prussian white material; the above-mentioned potassium-based Prussian white material was dispe...

Embodiment 3

[0047] Potassium ferrocyanide trihydrate was dissolved in deionized water to obtain solution I with a concentration of 0.4mol / L; manganese sulfate monohydrate, nickel sulfate hexahydrate, ferrous sulfate heptahydrate, and potassium citrate were dissolved in deionized water , Obtaining manganese sulfate monohydrate, nickel sulfate hexahydrate and ferrous sulfate heptahydrate total concentration is the solution II of 0.4mol / L, wherein the mol ratio of manganese sulfate monohydrate, nickel sulfate hexahydrate and ferrous sulfate heptahydrate is 7: 2:1, the ratio of the moles of potassium citrate to the total moles of manganese sulfate monohydrate, nickel sulfate hexahydrate and ferrous sulfate heptahydrate is 5:1; solution I and solution II are mixed and heated at 80°C Precipitation reaction to obtain a suspension; age the suspension at 80°C for 4 hours; finally centrifuge and vacuum dry at 110°C to obtain a potassium-based Prussian white material; disperse the above-mentioned pot...

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Abstract

The Prussian white composite material comprises an inner core and a carbon coating layer coating at least one part of the outer surface of the inner core, the general formula of the inner core is NaxMn1-yMy [Fe (CN) 6] z, M is selected from at least one of Fe, Co, Ni, Cu and Zn, x is larger than 1.5 and smaller than or equal to 2, y is larger than 0 and smaller than or equal to 0.3, and z is larger than 0.8 and smaller than or equal to 1. The Prussian white composite material provided by the invention is free of crystal water (including interstitial water and complexing water), has complete crystal lattices, has good ionic conductivity and thermal stability, and is almost not decomposed at 500 DEG C. The preparation method disclosed by the invention has the advantages of simple process, low cost, short period, low energy consumption and suitability for industrial production.

Description

technical field [0001] The invention belongs to the technical field of energy storage batteries, and in particular relates to a Prussian white composite material and its preparation method and application. Background technique [0002] With the rapid advancement of automobile electrification, the demand for lithium-ion power batteries is huge, resulting in increasingly tight supply of lithium resources and high prices. On the other hand, it is imperative to develop clean energy based on scenery. In order to improve the utilization efficiency of clean energy, it is necessary to configure energy storage batteries. In view of the current dominance of lithium-ion batteries in energy storage batteries, the rapid development of the energy storage industry has also exacerbated the rapid consumption of lithium resources. Therefore, it is imminent to develop new energy storage batteries. Sodium-ion batteries have comprehensive advantages such as good safety, low cost, abundant reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/054C01B32/05C01C3/12
CPCH01M10/054H01M4/13H01M4/625C01B32/05C01C3/12C01P2004/80C01P2004/62C01P2004/61Y02E60/10H01M4/366H01M4/58H01M4/36H01M4/1397H01M4/5825H01M2004/028
Inventor 徐雄文涂健谢健
Owner SO-FUN TECH CORP LTD
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