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Prussian blue as well as preparation method and application thereof

A Prussian blue, reaction technology, applied in the direction of positive electrode, ferricyanide, electrical components, etc., can solve the problems of low reversible gram capacity, unsatisfactory reversible gram capacity and cycle performance, and unsatisfactory safety.

Pending Publication Date: 2021-10-22
EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, provide a kind of Prussian blue and its preparation method, to solve the existing Prussian blue crystal existing vacancies and structural water and the technical problems such as low reversible gram capacity
[0007] Another object of the present invention is to provide Prussian blue and secondary battery, to solve existing high-nickel positive electrode material existing high cost and unsatisfactory safety or take existing Prussian blue as the reversible gram capacity and existing of the secondary battery of positive electrode material Technical problems with unsatisfactory cycle performance

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  • Prussian blue as well as preparation method and application thereof
  • Prussian blue as well as preparation method and application thereof
  • Prussian blue as well as preparation method and application thereof

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preparation example Construction

[0048] Correspondingly, the embodiment of the present invention provides the preparation method of the above-mentioned Prussian blue of the embodiment of the present invention. The technical process of the preparation method of the embodiment of the present invention Prussian blue is as figure 1 As shown, it includes the following steps:

[0049] S01: Prepare citrate, antioxidant and ferrous salt into a mixed solution;

[0050] S02: adding ferricyanide to the mixed solution to react to generate the precipitation reaction of Prussian blue;

[0051] S03: After adding the ferricyanide salt, aging the reaction mixture solution, and then performing solid-liquid separation treatment to obtain Prussian blue.

[0052] Wherein, in step S01, citrate is added in the mixed solution, which plays a role in suppressing the precipitation reaction rate in step S02, reducing the generation rate of Prussian blue crystal nuclei, improving the crystallinity of Prussian blue, and reducing the con...

Embodiment 1

[0073] This embodiment provides a kind of Prussian blue and its preparation method. The present embodiment Prussian blue is prepared according to the steps comprising the following preparation method:

[0074] S1: Weigh 3mmol of potassium ferricyanide and dissolve it in 60ml of deionized solution, stir well to form a clear and transparent A solution;

[0075] S2: Weigh 4.5 mmol of ferrous chloride, 4.5 g of potassium citrate, and 0.22 g of ascorbic acid, and dissolve them in 80 ml of deionized water to form a clear and transparent B solution;

[0076] S3: Drop solution A into solution B at a rate of 1.2ml / min, and keep stirring solution B continuously. After A contacts with B, a white precipitate is rapidly formed;

[0077] S4: After the reaction is finished, place the reaction bottle containing the solution B in water at 45° C. for 16 hours.

[0078] S5: The centrifuge is adjusted to 8000r / min to collect the powder, and washed three times with water.

[0079] S6: After th...

Embodiment 2

[0081] This embodiment provides a kind of Prussian blue and its preparation method. The present embodiment Prussian blue is prepared according to the steps comprising the following preparation method:

[0082] S1: Weigh 3mmol of potassium ferricyanide and dissolve it in 60ml of deionized solution, stir well to form a clear and transparent A solution;

[0083] S2: Weigh 4.5 mmol of ferrous sulfate, 4.5 g of potassium citrate, and 0.22 g of ascorbic acid, and dissolve them in 80 ml of deionized water to form a clear and transparent B solution;

[0084] S3: Drop solution A into solution B at a rate of 1.2ml / min, and keep stirring solution B continuously. After A contacts with B, a white precipitate is rapidly formed;

[0085] S4: After the reaction is finished, place the reaction bottle containing the solution B in water at 45° C. for 16 hours.

[0086] S5: The centrifuge is adjusted to 8000r / min to collect the powder, and washed three times with water.

[0087] S6: After the...

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Abstract

The invention discloses Prussian blue as well as a preparation method and application thereof. The prussian blue is prepared by taking ferricyanide and ferrous salt as iron sources and carrying out complex reaction in the presence of citrate and an antioxidant. The Prussian blue crystal form is complete, vacancy and structural water are less or the Prussian blue does not contain vacancy and structural water, the crystal structure is stable in the ion intercalation and deintercalation process, high reversible gram volume is given to the Prussian blue crystal form, ion diffusion is facilitated, and the Prussian blue crystal form has a good capacity retention rate characteristic under large current. The preparation method of the Prussian blue can ensure that the prepared Prussian blue is stable in structure and electrochemical performance, is high in efficiency, saves the production cost, does not generate toxic and harmful components, and is high in safety. Therefore, the Prussian blue can be applied as a positive electrode material.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a Prussian blue and its preparation method and application. Background technique [0002] With the ternary cathode material (LiNi x co y mn z o 2 ,x+y+z=1) involves the continuous consumption of non-renewable lithium, cobalt, and nickel ores and the sharp rise in prices, resulting in a continuous increase in the cost of lithium-ion batteries, especially in new energy electric vehicles, where the cost of battery packs accounts for 40-60% of the vehicle cost. In addition, the safety of high-nickel cathode materials has always been a difficulty that plagues researchers. At high temperature, the oxygen in the lattice of the ternary cathode material will release oxygen, resulting in irreversible structural damage accompanied by thermal runaway and violent combustion of the battery. The above problems severely limit the application of lithium-ion batteries in the field of lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525H01M10/052C01C3/12
CPCH01M4/58H01M10/0525H01M10/052C01C3/12H01M2004/028Y02E60/10
Inventor 伍攀羽江辉邹美靓孔少锋
Owner EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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