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Positive electrode material precursor, preparation method thereof and positive electrode material

A cathode material and precursor technology, applied in the field of sodium-ion batteries, can solve the problems that the precipitation rate of metal elements cannot be maintained stably, the synergistic effect of elements cannot be fully exerted, and the specific capacity of the product is affected, so as to improve cycle stability and regular morphology , Improve the effect of tap density

Pending Publication Date: 2022-08-02
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, M is a doping element with a low molar weight. When the above four metal elements are added dropwise to the lye for co-precipitation reaction, the pH value of the solution is constantly changing, and the precipitation speed of iron atoms and manganese atoms is the same as that of manganese atoms. The precipitation rate of nickel atoms is very different, and the precipitation coefficient is 10 to 30 orders of magnitude different, which leads to the inability to maintain a stable precipitation rate of metal elements, which is not conducive to uniform co-precipitation, and cannot give full play to the synergistic effect of elements, affecting the specific capacity of the product

Method used

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  • Positive electrode material precursor, preparation method thereof and positive electrode material
  • Positive electrode material precursor, preparation method thereof and positive electrode material
  • Positive electrode material precursor, preparation method thereof and positive electrode material

Examples

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Embodiment 1

[0051] This embodiment provides a preparation method and precursor of a positive electrode material precursor:

[0052] (1) Weigh manganese sulfate and nickel sulfate, mix, and dissolve in water to obtain manganese sulfate (concentration of 0.90mol / L) and nickel sulfate (concentration of 0.60mol / L) mixed metal liquid. Weigh ferric sulfate and copper sulfate, mix, and dissolve in water to obtain a mixed metal solution of ferric sulfate (concentration: 0.45 mol / L) and copper sulfate (concentration: 0.60 mol / L). Weigh sodium hydroxide and add deionized water to prepare a 4 mol / L sodium hydroxide solution.

[0053] (2) In the above-mentioned mixed metal solution of iron sulfate and copper sulfate, sodium citrate was added to make the concentration in the solution 20g / L, and the complexation reaction was carried out. The reaction temperature was 25°C and the time was 1h.

[0054] (3) add 4L of water in the reaction kettle, add 5mL of hydrazine hydrate, add 30g of sodium citrate, t...

Embodiment 2

[0056] This embodiment provides a preparation method and precursor of a positive electrode material precursor:

[0057] (1) Weigh manganese sulfate and nickel sulfate, mix, and dissolve in water to obtain manganese sulfate (concentration of 0.90mol / L) and nickel sulfate (concentration of 0.60mol / L) mixed metal liquid. Weigh ferrous sulfate and copper sulfate, mix, and dissolve in water to obtain a mixed metal liquid of ferrous sulfate (concentration of 0.90 mol / L) and copper sulfate (concentration of 0.60 mol / L). Weigh sodium hydroxide and add deionized water to prepare a 4 mol / L sodium hydroxide solution.

[0058] (2) In the above-mentioned mixed metal solution of iron sulfate and copper sulfate, sodium citrate was added to make the concentration in the solution 20g / L, and the complexation reaction was carried out. The reaction temperature was 25°C and the time was 1h.

[0059] (3) add 4L of water in the reaction kettle, add 5mL of hydrazine hydrate, add 30g of sodium citrat...

Embodiment 3

[0061] This embodiment provides a preparation method and precursor of a positive electrode material precursor:

[0062] (1) Weighing manganese sulfate and nickel sulfate, mixing, and dissolving in water to obtain a mixed metal liquid of manganese sulfate (concentration of 0.60 mol / L) and nickel sulfate (concentration of 0.90 mol / L). Weigh ferric sulfate and copper sulfate, mix, and dissolve in water to obtain a mixed metal solution of ferric sulfate (concentration: 0.45 mol / L) and copper sulfate (concentration: 0.60 mol / L). Weigh sodium hydroxide and add deionized water to prepare a 4 mol / L sodium hydroxide solution.

[0063] (2) In the mixed metal solution of ferric sulfate and copper sulfate prepared in step (1), sodium citrate was added to make the concentration in the solution 20g / L, and a complexation reaction was carried out, the reaction temperature was 25°C, and the time was 1h .

[0064] (3) add 4L of water in the reaction kettle, add 5mL of hydrazine hydrate, add 3...

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Abstract

The invention relates to the technical field of sodium ion batteries, in particular to a positive electrode material precursor, a preparation method thereof and a positive electrode material.The preparation method comprises the following steps that S1, an iron source, a copper source and a first complexing agent are mixed and subjected to a complexing reaction, and a mixed solution is obtained; s2, a reducing agent, a second complexing agent and water are mixed to obtain a base solution, a manganese source, a nickel source, the mixed solution and an alkaline solution are added into the base solution for precipitation reaction, and the positive electrode material precursor is obtained.By means of the method, the four elements of manganese, iron, nickel and copper can be evenly distributed in an atomic scale, the synergistic effect of manganese, iron, nickel and copper is fully exerted, and the positive electrode material is obtained. And the specific capacity of the positive electrode material formed by the precursor is remarkably improved by controlling the molar ratio of four elements of manganese, iron, nickel and copper in the molecular formula.

Description

Technical field [0001] The invention relates to the technical field of sodium ion batteries, and in particular to a positive electrode material precursor, a preparation method thereof and a positive electrode material. Background technique [0002] In recent years, with the development of renewable resources such as solar energy, wind energy, and tidal energy, there is an urgent need to build large-scale, low-cost, and high-security battery energy storage systems to meet future needs. The lithium-ion battery industry is taking advantage of the opportunity to take off. However, lithium-ion batteries also have some inherent problems, such as capacity attenuation and gas production problems caused by the mixed discharge of lithium and nickel. It has been proven that the global reserves of cobalt resources are limited and have a great impact on the environment. Lithium-ion batteries also have some inherent problems. The problem of sharp price increases caused by the mismatch bet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/485H01M4/505H01M4/525H01M10/054
CPCC01G53/006C01G53/44H01M4/525H01M4/505H01M4/485H01M10/054H01M2004/028Y02E60/10
Inventor 张宁万江涛李子郯杨红新张勇杰
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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