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Modified prussian blue material, sodium ion battery positive electrode plate and preparation method

A Prussian blue, modified technology, applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of reduced discharge capacity and cycle performance, poor high-rate performance, and low corresponding yield, so as to improve cycle performance and rate performance, good environmental stability, and low-cost effects

Inactive Publication Date: 2017-07-18
SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of preparing Prussian blue materials using cyano-transition metal complexes as a single iron source is high, and the corresponding yield is too low; and the Prussian blue materials prepared by direct mixed precipitation have high crystal water content, which will greatly reduce the discharge capacity and cycle performance, and ex-situ recombination with conductive materials can lead to poor high-rate performance

Method used

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  • Modified prussian blue material, sodium ion battery positive electrode plate and preparation method
  • Modified prussian blue material, sodium ion battery positive electrode plate and preparation method
  • Modified prussian blue material, sodium ion battery positive electrode plate and preparation method

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Embodiment 1

[0045] The preparation method of the modified Prussian blue material of this embodiment includes the following steps:

[0046] (1) Weigh methyl orange, ferric chloride hexahydrate and pyrrole in a molar ratio of 1:10:10. The mass of methyl orange is 0.392g, dissolved in deionized water, and 3.243g ferric chloride hexahydrate is added. Stir thoroughly to dissolve, and obtain solution A according to the concentration of ferric chloride hexahydrate as 0.05M;

[0047] (2) Add 0.84 mL of pyrrole dropwise to solution A, mix ultrasonically for 30 minutes, and place in an ice bath with magnetic stirring for 12 hours to obtain solution B;

[0048] (3) According to the molar ratio of sodium ferrocyanide to ferric chloride of 1:0.5, dissolve 0.24M sodium ferrocyanide in a solution containing 0.24M hydrochloric acid, and stir thoroughly to dissolve to obtain solution C;

[0049] (4) Drop solution C into the solution B drop by drop through a peristaltic pump, at 40 drops / min, and the volume of eac...

Embodiment 2

[0052] (1) Weigh methyl orange, ferric chloride hexahydrate and pyrrole in a molar ratio of 1:10:5. The mass of methyl orange is 0.392g, dissolved in deionized water, and 3.243g ferric chloride hexahydrate is added. Stir thoroughly to dissolve, and obtain solution A according to the concentration of ferric chloride hexahydrate as 0.05M;

[0053] (2) Add 0.42 mL of pyrrole dropwise to solution A, mix ultrasonically for 20 minutes, place in an ice bath and stir magnetically for 10 hours to obtain solution B;

[0054] (3) According to the molar ratio of sodium ferrocyanide to ferric chloride of 1:1, dissolve 0.12M sodium ferrocyanide in a solution containing 0.12M sulfuric acid, stir thoroughly to dissolve, and obtain solution C;

[0055] (4) Drop solution C into the solution B drop by drop through a peristaltic pump, at 20 drops / min, the volume of each drop is about 0.53 cm 3 The speed of mixing is dropwise, while the magnetic stirring speed is 500r / min, stirring for 10h, to obtain sol...

Embodiment 3

[0058] (1) Weigh methyl orange, ferric chloride hexahydrate and pyrrole in a molar ratio of 1:10:20. The mass of methyl orange is 0.392g, dissolved in deionized water, and 3.243g ferric chloride hexahydrate is added. Stir thoroughly to dissolve, and obtain solution A according to the concentration of ferric chloride hexahydrate as 0.05M;

[0059] (2) Add 1.68 mL of pyrrole dropwise to solution A, mix ultrasonically for 40 minutes, place in an ice bath and stir magnetically for 15 hours to obtain solution B;

[0060] (3) According to the molar ratio of sodium ferrocyanide to ferric chloride of 1:2, dissolve 0.06M sodium ferrocyanide in a solution containing 0.06M nitric acid, stir thoroughly to dissolve, and obtain solution C;

[0061] (4) Drop solution C into the solution B drop by drop through a peristaltic pump, at 50 drops / min, the volume of each drop is about 0.53 cm 3 The speed of mixing is drop by drop, while the magnetic stirring speed is 700r / min, stirring for 15h, to obtain ...

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Abstract

The invention discloses a modified prussian blue material, a sodium ion battery positive electrode plate and a preparation method. The preparation method for the modified prussian blue material at least comprises the steps of performing a reaction on methyl orange, ferric chloride and pyrrole based on a certain proportion to obtain a solution, then performing a reaction on the obtained solution with a mixed solution of sodium ferrocyanide and inorganic acid, and next, performing processing of centrifuging, washing, drying and the like to obtain the modified prussian blue material. Compared with the conventional synthesis method, the prepared modified prussian blue material is lower in crystal water content, less in defects, high in tubular polypyrrole conductivity and relatively high in environment stability, so that an electrolyte can permeate rapidly, and rapid diffusion of Na+ can be promoted to form a three-dimensional conductive network with prussian blue nanoparticles; therefore, the material conductivity is improved, and the material is novel and unique; in addition, the cycling performance and the rate capability of the material are greatly improved; and the modified prussian blue material is more suitable for application of an energy storage material, such as the positive electrode material of the sodium ion battery.

Description

Technical field [0001] The invention relates to a modified Prussian blue material, a sodium ion battery positive electrode sheet and a preparation method. Background technique [0002] In recent years, the application of lithium-ion batteries in the market has gradually increased. However, the cost is relatively high and the safety is relatively poor, which will bring inconvenience to daily life. Compared with lithium-ion batteries, sodium-ion batteries have abundant raw material resources, low cost, environmentally friendly, high energy density, and have more advantages as energy storage devices. However, due to the large size of sodium ions, it is difficult to move quickly in the crystal lattice, resulting in the suppression of the cycle life and rate performance of sodium ion batteries, and the choice of battery materials is also greatly restricted. [0003] Prussian blue and its analogues (Prussian Blue analogues, PBA for short) have an open-frame structure. This type of mater...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/136H01M4/1397H01M10/054
CPCH01M4/136H01M4/1397H01M4/58H01M10/054Y02E60/10
Inventor 闫小舍王红马紫峰
Owner SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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