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Prussian-blue type sodium ion battery positive electrode material and preparation method therefor

A sodium-ion battery and Prussian blue technology, which is applied in the field of sodium-ion battery cathode materials and its preparation, can solve problems such as capacity loss, and achieve the effects of reducing capacity fading, excellent performance, and low cost

Active Publication Date: 2017-07-04
湖州超钠新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the improvement of cycle stability or improvement of power performance, the uniform substitution of inactive elements often leads to a large loss of capacity.

Method used

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  • Prussian-blue type sodium ion battery positive electrode material and preparation method therefor
  • Prussian-blue type sodium ion battery positive electrode material and preparation method therefor
  • Prussian-blue type sodium ion battery positive electrode material and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Dissolve 0.968g of sodium ferrocyanide decahydrate in 100mL of deionized water to obtain a 20mmol / L sodium ferrocyanide solution.

[0032] 2) Dissolve 0.398g of ferrous chloride tetrahydrate in 100mL of deionized water to obtain a 20mmol / L ferrous chloride solution.

[0033] 3) Dissolve 0.285g of nickel dichloride hexahydrate and 0.159g of ferrous chloride tetrahydrate in 100mL of deionized water to obtain a mixed solution with a total cation concentration of 20mmol / L.

[0034] 4) Use as attached figure 1The shown device carries out co-precipitation reaction, and container A is mixed solution, and in container B is ferrous chloride solution, and container C is sodium ferrocyanide solution, and D is reaction vessel, and deionized water is filled in reaction vessel; A and container B, container B and reaction container, container C and reaction container are all connected by a catheter with a peristaltic pump; wherein, container A is connected at the beginning of the ...

Embodiment 2

[0039] 1) Dissolve 0.242g of sodium ferrocyanide decahydrate in 100mL of deionized water to obtain a 5mmol / L sodium ferrocyanide solution.

[0040] 2) Dissolve 0.099g of ferrous chloride tetrahydrate in 100mL of deionized water to obtain a 5mmol / L ferrous chloride solution.

[0041] 3) Dissolve 0.050 g of manganese dichloride tetrahydrate and 0.050 g of ferrous chloride tetrahydrate in 100 mL of deionized water to obtain a mixed solution with a total cation concentration of 5 mmol / L.

[0042] 4) same as embodiment 1, utilize as attached figure 1 The setup shown performs the co-precipitation reaction. Among them, container A is inserted at the beginning of the reaction. During the reaction process, the reaction vessel was filled with nitrogen gas, the flow rate was 20mL / min, the reaction vessel was heated to 25°C by a magnetic stirrer, and the flow rate of all peristaltic pumps was the same as 10mL / h, until the sodium ferrocyanide solution in vessel C was consumed When finis...

Embodiment 3

[0045] 1) Dissolve 4.84g of sodium ferrocyanide decahydrate in 100mL of deionized water to obtain a 100mmol / L sodium ferrocyanide solution.

[0046] 2) Dissolve 1.99g of ferrous chloride tetrahydrate and 0.5mg of vitamin C in 100mL of deionized water to obtain a 100mmol / L ferrous chloride solution.

[0047] 3) Dissolve 2.380 g of cobalt dichloride hexahydrate in 100 mL of deionized water to obtain a cobalt chloride solution with a total cation concentration of 100 mmol / L.

[0048] 4) same as embodiment 1, utilize as attached figure 1 The setup shown performs the co-precipitation reaction. Wherein, container A is inserted when the sodium ferrocyanide solution balance in container C is 10mL. During the reaction process, the reaction vessel was filled with argon gas at a flow rate of 100mL / min. The reaction vessel was heated to 90°C by a magnetic stirrer, and the flow rate of all peristaltic pumps was the same as 10mL / h. After consumption, turn off all peristaltic pumps and st...

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Abstract

The invention discloses a prussian-blue type sodium ion battery positive electrode material and a preparation method therefor. According to the material, iron ions in iron-nitrogen octahedron in prussian-blue crystal lattices are substituted by transitional metal elements from the interiors to the surfaces of crystal particles based on concentration gradient; the molecular formula of the positive electrode material is Na<x>M<y>Fe<1-y>[Fe(CN)<6>]<z>.nH<2>O, wherein M is a substituting element. The preparation method comprises the following steps of dissolving sodium ferrocyanide, ferrous chloride, and a mixture of substituting element chloride and ferrous chloride into deionized water separately to obtain each precursor solution; then performing a co-precipitation reaction to obtain a prussian-blue turbid liquid, wherein the substituting element is distributed from the interiors to the surfaces of the crystal particles based on concentration gradient; and performing centrifuging, washing and vacuum drying to prepare the positive electrode material. The positive electrode material has the characteristics of high capacity, high cycling stability, simple preparation and the like.

Description

technical field [0001] The invention relates to a positive electrode material of a sodium ion battery and a preparation method thereof, belonging to the field of energy materials. Background technique [0002] In recent years, with the gradual development and application of lithium-ion batteries from portable electronic devices to high-power electric vehicles, large-scale energy storage power stations and smart grids, the demand for lithium-ion batteries is increasing, but limited lithium resources limit the use of lithium-ion batteries. The sustainable development of Na-ion batteries with abundant reserves and relatively low price will have greater advantages in large-scale energy storage applications. Sodium and lithium are in the same main group and have similar chemical properties, so it is feasible to construct a sodium-ion battery that works similarly to a lithium-ion battery. [0003] Sodium-ion battery is a battery with a difference in sodium ion concentration. When...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/50H01M4/52H01M4/48H01M4/36H01M10/054
CPCH01M4/362H01M4/483H01M4/502H01M4/523H01M4/58H01M10/054Y02E60/10
Inventor 姜银珠王宝琦
Owner 湖州超钠新能源科技有限公司
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