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Prussian blue transition metal cyanide, preparation method thereof, and positive pole piece, secondary battery, battery pack and device related to prussian blue transition metal cyanide

A technology of transition metals and Prussian blue, applied in metal cyanide, secondary batteries, battery electrodes, etc., can solve the problems of poor energy density and low gram capacity of sodium-ion batteries, which affect the commercial application of sodium-ion batteries, and achieve improvement The effect of active ion transport performance and electronic conductivity, increasing particle size and powder compaction density, and high energy density

Active Publication Date: 2021-01-22
JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the commonly used cathode materials for lithium-ion batteries, Prussian blue transition metal cyanides still have the problem of low gram capacity, resulting in poor energy density of sodium-ion batteries, which affects the commercialization of sodium-ion batteries. application

Method used

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  • Prussian blue transition metal cyanide, preparation method thereof, and positive pole piece, secondary battery, battery pack and device related to prussian blue transition metal cyanide
  • Prussian blue transition metal cyanide, preparation method thereof, and positive pole piece, secondary battery, battery pack and device related to prussian blue transition metal cyanide
  • Prussian blue transition metal cyanide, preparation method thereof, and positive pole piece, secondary battery, battery pack and device related to prussian blue transition metal cyanide

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preparation example Construction

[0088] The second aspect of the present application provides a method for preparing a Prussian blue-like transition metal cyanide, according to which the above-mentioned Prussian blue-like transition metal cyanide can be prepared. The preparation method of Prussian blue transition metal cyanide comprises the following steps:

[0089] S1, providing a first solution containing transition metal cations, where the concentration of transition metal cations in the first solution is ≥0.1 mol / L.

[0090] S2, providing the second solution comprising the A salt of transition metal cyanate, the concentration of transition metal cyanate anion in the second solution is ≥0.1mol / L, and A is selected from one of alkali metal ions and alkaline earth metal ions or Several kinds.

[0091] S3, adding one of the first solution and the second solution to the other at a flow rate of 10cm / s~100m / s and within 0.5h~48h under stirring conditions Mixing, co-precipitation chemical reaction occurs, and a...

Embodiment 1

[0162] S1, under the condition of 25°C, disperse 6.292g of manganese chloride, 35g of sodium chloride, and 2.48g of sodium thiosulfate (antioxidant) in 100mL of deionized water to obtain the first solution.

[0163] S2, under the condition of 25° C., disperse 19.203 g of sodium ferrocyanide in 100 mL of deionized water to obtain a second solution.

[0164] S3, after heating the first solution to 80°C, inject the second solution at 25°C into the first solution within 10 hours at a flow rate of 2m / s using an injection needle with an inner diameter of 0.6mm to cause a co-precipitation chemical reaction, At the same time, magnetic stirring was carried out at a speed of 800 rpm / min. The needle of the injection needle is inserted below the liquid level to ensure the mixing effect.

[0165] S4, the obtained suspension was aged at 80°C for 24 hours with stirring, so that the small grains were dissolved and the large grains continued to grow.

[0166] S5, after suction filtration, wa...

Embodiment 2、11

[0168] Similar to Example 1, the difference is that the antioxidant in the first solution is 1 g of ascorbic acid, and the remaining parameters are shown in Table 1.

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Abstract

The invention belongs to the technical field of energy storage devices, and provides a prussian blue transition metal cyanide, a preparation method thereof, and a positive pole piece, a secondary battery, a battery pack and a device related to the prussian blue transition metal cyanide. The prussian blue transition metal cyanide comprises secondary particles, wherein the secondary particles comprise a plurality of primary particles; and the primary particles are in a spherical shape or a sphere-like shape. The prussian blue transition metal cyanide has the problem of relatively low gram volume, so that the energy density of the sodium ion battery is relatively poor, and the commercial application of the sodium ion battery is influenced. The secondary particles can increase the particle granularity and the powder compaction density, can further increase the compaction density of the positive pole piece, and improve the active ion transmission performance and the electronic conductivityof a positive pole piece, so that the energy density and the rate capability of the secondary battery adopting the secondary particles can be improved.

Description

technical field [0001] The application belongs to the technical field of energy storage devices, and in particular relates to a Prussian blue transition metal cyanide, a preparation method thereof, and related positive electrode sheets, secondary batteries, battery modules, battery packs and devices. Background technique [0002] In recent years, with the large-scale promotion of lithium-ion batteries in emerging fields such as new energy vehicles and electrochemical energy storage around the world, the abundance of lithium and other precious metal resources such as cobalt and nickel has gradually aroused people's concerns. This is due to the rapid increase in demand that can reduce the reserves of these resources, or significantly increase the cost of extraction or mining. Therefore, the development of new electrochemical energy storage systems with high resource abundance to achieve low energy storage costs has received more and more attention. [0003] Secondary batterie...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/136H01M10/054C01C3/08
CPCH01M4/58H01M4/136H01M10/054C01C3/08H01M2004/028H01M2004/021C01P2004/03C01P2002/72C01P2006/40C01P2004/61Y02E60/10C01C3/11H01M4/36C01P2006/11C01P2004/32
Inventor 田佳瑞郭永胜欧阳楚英张欣欣黄丽婷苏硕剑林文光张金余
Owner JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED
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