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Lithium ion battery negative electrode material and preparation method thereof

A lithium-ion battery and anode material technology, which is applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve the problems of affecting battery life, non-recoverable, high cost, etc., to promote lithium ion transmission, improve black Spot problem, improve the effect of negative electrode plate lithium precipitation phenomenon

Pending Publication Date: 2021-10-01
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when lithium-ion batteries work in a low-temperature environment, lithium deposition on the negative electrode often occurs, which will lead to a sharp decline in the capacity of the battery and cannot be recovered, which not only affects the life of the battery, but also brings great safety hazards. Based on this This phenomenon, researchers modify the surface of graphite by means of doping and coating to develop graphite materials with excellent low-temperature performance, but this method is costly and complicated

Method used

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  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof

Examples

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preparation example Construction

[0031] 2, a preparation method of lithium ion battery negative electrode material, comprises the following steps:

[0032] Step (A): Add the conductive agent in the above parts by weight into the stirrer and stir, add the active material in the above parts by weight and mix and stir, scrape the glue, add part of the thickener, stir, scrape the glue, add part of the deionized water to mix stirring to obtain the first mixed slurry;

[0033] Step (B): adding the binder, the remaining part of the thickener and the remaining part of deionized water in the above parts by weight into the first mixed slurry, stirring and mixing, and vacuumizing to obtain the second mixed slurry;

[0034] Step (C): adding the sizing agent in the above parts by weight into the second mixed slurry and stirring to obtain the lithium ion battery negative electrode material.

[0035] In the preparation method of the present invention, the conductive agent that is difficult to disperse is first stirred to m...

Embodiment 1

[0045] A lithium ion battery includes a positive electrode sheet, a negative electrode sheet, a diaphragm spaced between the positive electrode sheet and the negative electrode sheet, and an electrolyte; wherein, the negative electrode material of the lithium ion battery is coated on the negative electrode sheet.

[0046] (1) Preparation of positive electrode sheet

[0047] Mix NCM811 positive electrode active material, conductive agent superconducting carbon and carbon tubes, and binder polyvinylidene fluoride at a mass ratio of 96:2.0:0.5:1.5 to make positive electrode slurry, and coat the positive electrode slurry on the current collector aluminum foil On one surface of the aluminum foil, after drying and winding at 85°C, the positive electrode slurry is coated and dried on the other side of the aluminum foil according to the above method, and then the prepared aluminum foil is double-sided coated with the positive electrode active material layer. Cold pressing treatment; e...

Embodiment 2

[0068] The difference from Example 1 is the preparation of the lithium ion battery negative electrode material.

[0069] (2) Preparation method of negative electrode material

[0070] A lithium ion battery negative electrode material, comprising the following raw materials in parts by weight: 30 parts of active material, 0.01 part of conductive agent, 0.01 part of wetting agent, 1.0 part of binder, 5 parts of deionized water and 0.1 part of thickener.

[0071] The active material is a mixture of artificial graphite and hard carbon in a mass ratio of 2:3.

[0072] The conductive agent is a mixture of conductive carbon black and carbon nanotubes in a mass ratio of 1:5.

[0073] The binder is styrene-butadiene rubber, and the solid content of the binder is 20%.

[0074] The wetting agent is an oxide of main group III, the pore diameter of the wetting agent is 20nm, and the solid content is 15%.

[0075] The thickener is sodium carboxymethylcellulose, and the solid content of t...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery negative electrode material and a preparation method thereof. The lithium ion battery negative electrode material comprises the following raw materials by weight: 30-50 parts of an active substance, 0.01-1.5 parts of a conductive agent, 0.01-2 parts of an impregnating compound, 1.0-2.5 parts of a binder, 0.1-5 parts of deionized water and 0.1-1.0 part of a thickener. According to the lithium ion battery negative electrode material disclosed by the invention, the lithium separation phenomenon of a negative electrode plate of a battery in a low-temperature environment is improved by adding the impregnating compound, and the unique porous structure of the impregnating compound can promote lithium ion transmission so that the problem of black spots on a circulating interface is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] With the development of the economy, people's awareness of environmental protection has gradually increased, and lithium-ion batteries, as a clean energy source, are widely used in consumer electronics products. However, when lithium-ion batteries work in a low-temperature environment, lithium-ion deposition on the negative electrode often occurs, which will lead to a sharp decline in the capacity of the battery and cannot be recovered, which not only affects the life of the battery, but also brings great potential safety hazards. Based on this For this phenomenon, researchers modify the surface of graphite by means of doping and coating to develop graphite materials with excellent low-temperature performance, but this method is costly and co...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/42H01M10/0525
CPCH01M4/62H01M4/628H01M10/4235H01M10/0525Y02E60/10
Inventor 吴秋丽张凯马斌陈杰杨山李载波
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD