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Prussian white material capable of being used for sodium ion battery positive electrode and preparation method of Prussian white material

A technology of Prussian white and sodium ions, which is applied in the field of batteries, can solve the problems of limiting volume energy density and mass energy density, reducing cycle life, and reducing compaction of material electrode density, so as to achieve volume energy density and mass energy density improvement, processing Improved performance and shortened response time

Pending Publication Date: 2022-04-22
DALIAN CBAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are following three major problems in this synthesis method: the one, the reaction process time is long, usually 6-10h; Deposition usually produces a large amount of Fe(CN) 6 4- The ultra-small grains and low crystallinity grains with vacancies, but these vacancies are occupied by coordination water that is difficult to remove, which reduces the electrochemical performance of the material, such as poor rate performance and reduced cycle life; at the same time, rapid deposition also As a result, the electrode density of the material is reduced and the processing performance of the material is deteriorated, which limits its volumetric energy density and mass energy density.

Method used

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  • Prussian white material capable of being used for sodium ion battery positive electrode and preparation method of Prussian white material

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Embodiment 1

[0037] The present embodiment provides a kind of Prussian white material, and its preparation method is as follows:

[0038] 1. Configuration solution A: Na +Concentration is the inorganic sodium salt aqueous solution of 6mol / L, and sodium salt is sodium carbonate, sodium bicarbonate, and the molar ratio of the two is 2:1;

[0039] 2. Configuration solution B: Fe(CN) 6 4- Na at a concentration of 0.10mol / L 4 Fe(CN) 6 solution;

[0040] 3. Configuration solution C: Mn 2+ Concentration is the inorganic salt aqueous solution of 0.15mol / L, manganese dichloride, manganese sulfate, the molar ratio of the two is 3:1;

[0041] 4. Add 3L of solution A into a 10L autoclave, seal the autoclave, and pour protective gas into it. The gas pressure is set at 3MPa. The protective gas is a mixed gas of nitrogen and hydrogen, and the molar ratio of nitrogen to hydrogen is 9:1. ;

[0042] 5. Set the temperature of the autoclave to 60°C, add 2L of solution B and 2L of solution C into the a...

Embodiment 2

[0045] The present embodiment provides a kind of Prussian white material, and its preparation method is as follows:

[0046] 1. Configuration solution A: Na + Concentration is the inorganic sodium salt aqueous solution of 6mol / L, and sodium salt is sodium carbonate, sodium bicarbonate, and the molar ratio of the two is 2:1;

[0047] 2. Configuration solution B: Fe(CN) 6 4- Na at a concentration of 0.10mol / L 4 Fe(CN) 6 solution;

[0048] 3. Configuration solution C: Fe 2+ The concentration is 0.15mol / L inorganic salt solution, ferric chloride, ferric sulfate, the molar ratio of the two is 3:1;

[0049] 4. Add 3L of solution A into a 10L autoclave, seal the autoclave, and pour protective gas into it. The gas pressure is set at 3MPa. The protective gas is a mixed gas of nitrogen and hydrogen, and the molar ratio of nitrogen to hydrogen is 9:1. ;

[0050] 5. Set the temperature of the autoclave at 60°C, add 2L of solution B and 2L of solution C into the autoclave through a...

Embodiment 3

[0053] The present embodiment provides a kind of Prussian white material, and its preparation method is as follows:

[0054] 1. Configuration solution A: Na + Concentration is the inorganic sodium salt aqueous solution of 6mol / L, and sodium salt is sodium carbonate, sodium bicarbonate, and the molar ratio of the two is 2:1;

[0055] 2. Configuration solution B: Fe(CN) 6 4- Na at a concentration of 0.10mol / L 4 Fe(CN) 6 solution;

[0056] 3. Configuration solution C: Mn 2+ Concentration is the inorganic salt aqueous solution of 0.15mol / L, manganese dichloride, manganese sulfate, the molar ratio of the two is 3:1; Cu 2+ The concentration is 0.01mol / L, the copper salt is CuCl 2 ;

[0057] 4. Add 3L of solution A into a 10L autoclave, seal the autoclave, and pour protective gas into it. The gas pressure is set at 3MPa. The protective gas is a mixed gas of nitrogen and hydrogen, and the molar ratio of nitrogen to hydrogen is 9:1. ;

[0058] 5. Set the temperature of the au...

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Abstract

The invention relates to the field of batteries, in particular to a Prussian white material capable of being used for a sodium ion battery positive electrode and a preparation method of the Prussian white material, and the Prussian white material is prepared by reacting an inorganic sodium salt aqueous solution, a Na4Fe (CN) 6 solution and an inorganic metal salt aqueous solution in an anaerobic or anaerobic atmosphere at the pressure of 0.2-10 MPa and the temperature of 50-100 DEG C. Compared with the traditional process, the technical scheme of the invention has the advantages that the reaction time is greatly shortened; the Prussian white material is high in crystallinity and less in coordinated water, the sodium content is close to a theoretical value, the electrical performance of the corresponding battery is remarkably improved, and particularly the cycle life is prolonged; the Prussian white material is high in compaction density and good in processability, and the volume energy density and the mass energy density are remarkably improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a Prussian white material that can be used for the positive electrode of a sodium ion battery and a preparation method thereof. Background technique [0002] In the 21st century, lithium batteries are used in many fields such as mobile phones, computers, wearable devices, electric vehicles, two-wheeled bicycles, electric tools, and street lamps. In recent years, the consumption of lithium resources has shown a large amount of use and a fast consumption rate, and the increase in lithium production cannot meet the increase in consumption: this is because first, lithium resources are limited, mainly in the state of spodumene ore and salt lake lithium Second, lithium cannot be extracted from salt lakes in winter. [0003] In contrast, sodium has a wide range of sources and abundant reserves. The reserve of sodium is 420 times that of lithium, and the price is much lower than that of lithium...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M10/054
CPCH01M4/36H01M4/485H01M10/054Y02E60/10
Inventor 王元杰薄晋科曹仕良田秀君王文武
Owner DALIAN CBAK POWER BATTERY CO LTD
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