Anhydrous Prussian white material, and preparation method and application thereof

A Prussian white and solution technology, used in electrical components, electrochemical generators, battery electrodes, etc., can solve problems affecting product structure stability and electrochemical performance, and achieve excellent rate performance, long cycle life, high capacity. Effect

Pending Publication Date: 2021-12-24
浙江宇钠科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis of Prussian blue materials is generally carried out in aqueous solution, and the crystals often contain crystal water, which affects the structural stability and electrochemical performance of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Potassium ferrocyanide trihydrate is dissolved in deionized water to obtain a solution I with a concentration of 0.5mol / L; manganese sulfate monohydrate, nickel sulfate hexahydrate, and potassium citrate are dissolved in deionized water to obtain manganese sulfate monohydrate and Solution II with a total concentration of nickel sulfate hexahydrate of 0.5 mol / L, wherein the molar ratio of manganese sulfate monohydrate and nickel sulfate hexahydrate is 9:1, and the moles of potassium citrate and the total moles of manganese sulfate monohydrate and nickel sulfate hexahydrate The ratio of numbers is 4:1; mix solution I and solution II, and obtain a suspension by co-precipitation reaction at 60°C; age the suspension at 60°C for 4 hours, and add potassium thiosulfate during the aging process , the ratio of the added molar amount to the total molar amount of manganese sulfate monohydrate and nickel sulfate hexahydrate is 1:1; finally, it is centrifuged and dried in vacuum at 11...

Embodiment 2

[0044] Potassium ferrocyanide trihydrate is dissolved in deionized water to obtain a concentration of solution I of 0.4mol / L; Manganese sulfate monohydrate, copper sulfate pentahydrate, and potassium citrate are dissolved in deionized water to obtain manganese sulfate monohydrate and Solution II with a total concentration of copper sulfate pentahydrate of 0.4mol / L, wherein the molar ratio of manganese sulfate monohydrate to copper sulfate pentahydrate is 8:1, the molar number of potassium citrate is equal to the total moles of manganese sulfate monohydrate and copper sulfate pentahydrate The ratio of numbers is 3:1; mix solution I and solution II, and obtain a suspension by co-precipitation reaction at 60°C; age the suspension at 60°C for 4 hours, add potassium iodide during the aging process, and add mole The ratio of the amount to the total molar amount of manganese sulfate monohydrate and copper sulfate pentahydrate is 1:1; finally, it is centrifuged and dried in vacuum at 1...

Embodiment 3

[0046] Potassium ferrocyanide trihydrate is dissolved in deionized water to obtain a solution I with a concentration of 0.3mol / L; manganese sulfate monohydrate, zinc sulfate heptahydrate, and potassium citrate are dissolved in river water to obtain manganese sulfate monohydrate and heptahydrate Solution II with a total concentration of zinc sulfate water of 0.3 mol / L, wherein the molar ratio of manganese sulfate monohydrate and zinc sulfate heptahydrate is 10:1, the moles of potassium citrate and the total moles of manganese sulfate monohydrate and zinc sulfate heptahydrate The ratio is 5:1; solution I and solution II are mixed, and the suspension is obtained by co-precipitation at 60°C; the suspension is aged at 60°C for 4 hours, and potassium tetrathionate is added during the aging process. The ratio of the added molar amount to the total molar amount of manganese sulfate monohydrate and zinc sulfate heptahydrate is 1:1; finally, it is centrifuged and dried in vacuum at 110°C...

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PUM

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Abstract

The invention discloses an anhydrous Prussian white material and a preparation method thereof. The preparation method specifically comprises the following steps: firstly, mixing potassium ferrocyanide with deionized water to obtain a solution I; mixing soluble bivalent transition metal salt, organic acid potassium salt and deionized water to obtain a solution II; then mixing the solution I and the solution II, and carrying out a co-precipitation reaction to obtain a low-crystal-water potassium-based Prussian white material; and carrying out ion exchange reaction in an organic solvent containing sodium salt to obtain the sodium-based Prussian white material without crystal water. The material is used as a sodium ion battery positive electrode and has excellent electrochemical performance.

Description

technical field [0001] The invention relates to the field of novel energy storage batteries, in particular to an anhydrous Prussian white material and its preparation method and application. Background technique [0002] Currently, common energy storage batteries include sodium-sulfur batteries, lithium-ion batteries, lead-acid batteries, and flow batteries. However, the overall performance of this type of energy storage battery is not ideal, and it faces problems such as cost, resources, environmental protection, low energy density, and poor safety. In contrast, sodium-ion batteries have comprehensive advantages such as good safety, low cost, abundant resources, and environmental friendliness, and are very suitable for large-scale energy storage. Prussian blue materials are suitable as anode materials for sodium-ion batteries due to the open framework structure in their structure, which is conducive to the deintercalation of large-sized sodium ions. However, the synthesis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/12H01M4/58H01M10/054
CPCC01C3/12H01M4/58H01M10/054C01P2002/88C01P2006/40Y02E60/10
Inventor 刘双宇李堃马昱吴可人谢健
Owner 浙江宇钠科技有限公司
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