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Layered structure sodium ion battery positive electrode material precursor and preparation method thereof

A sodium-ion battery and cathode material technology, applied in battery electrodes, structural parts, secondary batteries, etc., can solve problems such as uneven distribution of sodium elements, increased surface alkali content, and impact on electrochemical performance, so as to improve diffusion speed, Reduce the dosage and solve the effect of excessive alkali content on the surface

Pending Publication Date: 2022-07-29
南通金通储能动力新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of preparing sodium ion cathode materials, due to the large atomic radius of sodium ions, their diffusion rate is relatively slow, which leads to uneven distribution of sodium elements inside and outside the cathode material, increased surface alkali content, and affects electrochemical performance.

Method used

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  • Layered structure sodium ion battery positive electrode material precursor and preparation method thereof
  • Layered structure sodium ion battery positive electrode material precursor and preparation method thereof
  • Layered structure sodium ion battery positive electrode material precursor and preparation method thereof

Examples

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Comparison scheme
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Embodiment 1

[0044] A method for preparing a layered structure sodium-ion battery cathode material precursor, comprising:

[0045] Step 1. Prepare a mixed solution of Ni, Mn, Cr, and acetylene glycol, wherein the total molar concentration of Ni, Mn, and Cr in the mixed solution is 2.0 mol / L, and the molar ratio is 55:42:3. The mass percentage is 0.2%;

[0046] The preparation molar concentration is 10mol / L sodium hydroxide or potassium hydroxide solution as precipitant;

[0047] Aqueous ammonia solution with a molar concentration of 0.2 mol / L was prepared as a complexing agent;

[0048] Step 2: Add pure water, acetylenic diol, the precipitating agent and the complexing agent to the closed reaction kettle to form a bottom liquid, the pH value of the bottom liquid is controlled by the precipitating agent to be 11.20-11.60, and the temperature is maintained at 60 ℃; the ammonia concentration in the bottom liquid is 0.08mol / L, and the mass percentage of acetylene glycol in the bottom liquid ...

Embodiment 2

[0067] A method for preparing a layered structure sodium-ion battery cathode material precursor, comprising:

[0068] Step 1: Prepare a mixed solution of Ni, Mn, Cr, and acetylene glycol, wherein the total molar concentration of Ni, Mn, and Cr in the mixed solution is 2.0 mol / L, and the molar ratio is 65:32:3. The mass percentage is 0.2%;

[0069] The preparation molar concentration is 10mol / L sodium hydroxide or potassium hydroxide solution as precipitant;

[0070] Aqueous ammonia solution with a molar concentration of 0.2 mol / L was prepared as a complexing agent;

[0071] Step 2: Add pure water, acetylenic diol, the precipitating agent and the complexing agent to the closed reaction kettle to form a bottom liquid, the pH value of the bottom liquid is controlled by the precipitating agent to be 11.20-11.60, and the temperature is maintained at 60 ℃; the ammonia concentration in the bottom liquid is 0.08mol / L, and the mass percentage of acetylene glycol in the bottom liquid ...

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Abstract

The chemical formula of the layered structure sodium ion battery positive electrode material precursor is NixMnyCrz (OH) 2. KNaOH, and the preparation method comprises the following steps: 1, preparing a mixed solution of Ni, Mn, Cr and alkynediol; preparing a sodium hydroxide or potassium hydroxide solution as a precipitator; preparing an ammonia water solution as a complexing agent; 2, adding pure water, alkynediol, a precipitator and a complexing agent to prepare a base solution; 3, introducing a mixed gas of oxygen and nitrogen, and continuously adding the mixed solution, a precipitant and a complexing agent into the kettle for coprecipitation; controlling the solid content in the kettle, and stopping the reaction when the material granularity reaches a target; and 4, carrying out filter pressing, washing and drying on the product to obtain the loose and porous sodium ion battery positive electrode material precursor. The precursor can improve the diffusion speed of sodium ions, the uniformity of sodium elements inside and outside the sintered positive electrode material is high, the dosage of an external sodium source can be reduced, and the problem that the alkali content of the surface of the positive electrode material is too high in the sintering process is effectively solved.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a layered structure sodium ion battery positive electrode material precursor and a preparation method thereof. Background technique [0002] The rapid development of new energy vehicles has triggered the battle for "lithium", and the relative shortage of lithium resources has led to the high cost of lithium-ion batteries. Compared with the scarcity of lithium resources, sodium has high reserves on earth and is cheap, so sodium-ion batteries have very broad application prospects. [0003] The performance of Na-ion batteries is mainly affected by the cathode material of Na-ion batteries. Among the cathode materials for Na-ion batteries, layered transition metal oxides have attracted much attention due to their high capacity and good cycling performance. However, in the process of preparing sodium ion cathode material, due to the larg...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M4/485H01M10/054
CPCC01G53/006C01G53/50H01M4/525H01M4/505H01M4/485H01M10/054C01P2004/61C01P2004/52C01P2006/11C01P2006/12C01P2006/40H01M2004/028Y02E60/10
Inventor 李加闯褚凤辉黄帅杰朱用王梁梁
Owner 南通金通储能动力新材料有限公司
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