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Organic silicide modified hydrophobic positive electrode material and preparation method thereof

An organosilicon compound and cathode material technology, which is applied in battery electrodes, electrical components, circuits, etc., can solve problems such as alkali adsorption of moisture, achieve low cost, improve material interface stability and stability, and reduce electrolyte erosion.

Pending Publication Date: 2022-01-04
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is simple and easy to control, and can effectively solve the problem of moisture adsorption by trace residual alkali on the surface of positive electrode materials

Method used

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  • Organic silicide modified hydrophobic positive electrode material and preparation method thereof
  • Organic silicide modified hydrophobic positive electrode material and preparation method thereof
  • Organic silicide modified hydrophobic positive electrode material and preparation method thereof

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preparation example Construction

[0022] The preparation method of the organic silicide-modified hydrophobic positive electrode material involved in the present invention comprises the following steps:

[0023] S1. Co-doping the base positive electrode material with Mo / Al elements, washing with deionized water, and coating with Ce oxide;

[0024] S2, adding the organic silicon compound into the solvent to form a uniform solution; the organic silicon compound is octadecyltrichlorosilane (OTS), and the molecular structure is shown in figure 1 The solvent is one or more of alkanes, ketones, pyridine, ethers, preferably one or more of normal hexane, cyclohexane, acetone, pyridine, propylene glycol ether, ether, more preferably One or more of n-hexane, cyclohexane, and propylene glycol ether. Preferably, the volume ratio of the organic silicon compound to the solvent is 1:(100-300).

[0025] S3, adding the positive electrode material of the matrix into the mixed uniform solution, and stirring at a constant speed ...

Embodiment 1

[0028] A method for preparing an organosilicon compound-modified hydrophobic positive electrode material, comprising the steps of:

[0029] S1. Co-doping the base positive electrode material with Mo / Al elements, washing with deionized water, and coating with Ce oxide;

[0030] S2. Take octadecyltrichlorosilane and n-hexane separately, configure 200mL n-hexane solution of octadecyltrichlorosilane with a volume ratio of 1:200, and stir evenly;

[0031] S3. Weighing 100 g of the matrix positive electrode material, slowly adding the positive electrode material into the n-hexane solution of octadecyltrichlorosilane, stirring at a constant speed for 3 hours, to obtain a solid-liquid mixture;

[0032] S4. Use filtering equipment to filter the obtained solid-liquid mixture, transfer the filtered solid filter cake to a vacuum oven at 80°C for 12 hours, and the vacuum degree is (-0.1~-0.08) MPa to obtain a hydrophobic positive electrode Material.

Embodiment 2

[0034] S1. Co-doping the base positive electrode material with Mo / Al elements, washing with deionized water, and coating with Ce oxide;

[0035] S2. Weigh octadecyltrichlorosilane and n-hexane respectively, configure 200mL n-hexane solution of octadecyltrichlorosilane with a volume ratio of 1:300, and stir evenly;

[0036] S3. Weighing 100 g of the matrix positive electrode material, slowly adding the positive electrode material into the n-hexane solution of octadecyltrichlorosilane, stirring at a constant speed for 3 hours, to obtain a solid-liquid mixture;

[0037] S4. Use filtering equipment to filter the obtained solid-liquid mixture, transfer the filtered solid filter cake to a vacuum oven at 80°C for 12 hours, and the vacuum degree is (-0.1~-0.08) MPa to obtain a hydrophobic positive electrode Material.

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Abstract

The invention belongs to the technical field of lithium ion battery positive electrode materials, and particularly relates to an organic silicide modified hydrophobic positive electrode material and a preparation method thereof. The hydrophobic positive electrode material is obtained by modifying a matrix positive electrode material through organic silicide, and the matrix positive electrode material is of a core-shell structure and is prepared through a coprecipitation-high-temperature sintering method. The preparation method of the hydrophobic positive electrode material comprises the following steps: co-doping Mo / Al elements on a matrix positive electrode material, washing the matrix positive electrode material with deionized water, and coating the matrix positive electrode material with Ce oxide; adding organic silicide into a solvent to form a uniform solution, wherein the volume ratio of the organic silicide to the solvent is 1: (100-300); adding the treated matrix positive electrode material into the uniform solution, and stirring at a constant speed for 0.5-6 hours to obtain a solid-liquid mixed solution; and performing post-treatment to obtain the hydrophobic positive electrode material. The method is simple and easy to control, and can effectively solve the problem that trace residual alkali on the surface of the positive electrode material adsorbs moisture.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a hydrophobic positive electrode material modified with organic silicides and a preparation method. Background technique [0002] In recent years, with the stringent requirements for high specific capacity put forward by some electric energy systems, cathode materials have gradually developed in the direction of high nickel. The purpose is to increase the specific capacity of the material by increasing the nickel content, so that the material can meet the performance index requirements of high specific capacity. . However, the increase of nickel content will increase the total alkali content on the surface of the material, that is, more lithium residues on the surface. Lithium residues can easily absorb moisture and carbon dioxide in the air to form Li 2 CO 3 And LiOH, the total alkalinity on the surface of the materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCH01M4/628H01M4/505H01M4/525Y02E60/10
Inventor 裴东李文升李婧许国峰刘攀张冉
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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