Method for preparing lithium ion battery positive electrode material

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc. to achieve the effects of accelerating transmission speed, improving cycle performance, and refining material particles

Active Publication Date: 2017-05-31
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current commercial positive electrode active materials are still difficult to meet the requirements due to their own structural limitations, and are the bottleneck technology for the development of high energy density, high cycle life, high rate performance, and fast charge-discharge lithium-ion batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Adopt the inventive method to prepare LiFePO 4 / The steps of the graphene composite are as follows:

[0023] Step 1: Add 1g graphene to 200mL alcohol solution to prepare 0.5wt% graphene solution. After the glass rod is stirred evenly, a monodisperse graphene solution is prepared by ultrasonic oscillation;

[0024] Step 2: Move the graphene solution to a high-speed shear emulsification homogenizer for shear dispersion to obtain a uniform graphene solution. The frequency is set to 30HZ, and the cutting time is 30min;

[0025] Step 3:: Add 100g of positive electrode active material powder into the graphene solution, and put them into a zirconia ball mill jar and mix them by ball milling machine, and the mixing time is 24h;

[0026] Step 4: Take out the mixed slurry, put it into an oven for drying, and the temperature of the oven is 80°C;

[0027] Step 5: The dried material is crushed and passed through a 400-mesh sieve to obtain positive electrode active material / graph...

Embodiment 2

[0029] Adopt the inventive method to prepare LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 / The steps of the graphene composite are as follows:

[0030] Step 1: Add 1g graphene to 200mL alcohol solution to prepare 0.5wt% graphene solution. After the glass rod is stirred evenly, a monodisperse graphene solution is prepared by ultrasonic oscillation;

[0031] Step 2: Move the graphene solution to a high-speed shear emulsification homogenizer for shear dispersion to obtain a uniform graphene solution. The frequency is set to 30HZ, and the cutting time is 30min;

[0032] Step 3:: Add 100g of positive electrode active material powder into the graphene solution, and put them into a zirconia ball mill jar and mix them by ball milling machine, and the mixing time is 24h;

[0033] Step 4: Take out the mixed slurry, put it into an oven for drying, and the temperature of the oven is 80°C;

[0034] Step 5: The dried material is crushed and passed through a 400-mesh sieve to obtain positive electrode ...

Embodiment 3

[0036] Adopt the inventive method to prepare LiNi 0.8 co 0.15 Al 0.05 / The steps of the graphene composite are as follows:

[0037] Step 1: Add 1g graphene to 200mL alcohol solution to prepare 0.5wt% graphene solution. After the glass rod is stirred evenly, a monodisperse graphene solution is prepared by ultrasonic oscillation;

[0038] Step 2: Move the graphene solution to a high-speed shear emulsification homogenizer for shear dispersion to obtain a uniform graphene solution. The frequency is set to 30HZ, and the cutting time is 30min;

[0039] Step 3:: Add 100g of positive electrode active material powder into the graphene solution, and put them into a zirconia ball mill jar and mix them by ball milling machine, and the mixing time is 24h;

[0040] Step 4: Take out the mixed slurry, put it into an oven for drying, and the temperature of the oven is 80°C;

[0041] Step 5: The dried material is crushed and passed through a 400-mesh sieve to obtain positive electrode act...

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PUM

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Abstract

The invention discloses a method for preparing a lithium ion battery positive electrode material. The method comprises the following steps: preparing a monodisperse graphene solution with consistent flake diameter size and good dispersion in an ultrasonic oscillation manner; and transferring the graphene solution into a high-shear emulsifying homogenizer for performing shearing dispersion, and filling the sheared graphene solution and a positive active material into a zirconia ball milling tank together for performing ball milling and mixing. The graphene solution is mixed with the positive active material in a mechanical ball milling manner, so that the graphene can be inlaid into or coated with positive active material granules, an excellent bonding interface can be formed, and the positive active material granules are refined; and therefore, the material is uniform, and the rate capability and consistency of the material are improved. Finally, the positive slurry subjected to ball milling is dried, ground and screened so as to obtain the positive electrode material powder.

Description

technical field [0001] The invention relates to a preparation method of a cathode material of a lithium ion battery, belonging to the technical field of composite materials. Background technique [0002] During the charging process of lithium-ion batteries, Li + Come out from the positive electrode, releasing electrons, Li + After the electrolyte is embedded in the negative electrode, the compensation charge of the electrons is transferred from the external circuit to the negative electrode to maintain the charge balance; when the battery is discharged, the electrons go from the negative electrode to the positive electrode through the external circuit. Inside the battery, Li + Migrate to the positive pole, embed into the positive pole, and get electrons from the external circuit. Therefore, the charging and discharging process of the battery is accompanied by Li + and the diffusion and transport process of electrons, while Li + The diffusion and transmission speed of ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 燕绍九南文争王楠陈翔洪起虎
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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