Negative electrode material and lithium ion battery containing same

A negative electrode material and negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of slow bulk electron transport and increased side reactions

Pending Publication Date: 2022-05-10
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, silicon oxide is an insulator, and the electron transport in the bulk phase is slow, and the abundant micropores in amorphous carbon will increase the side reactions of the electrolyte at high temperatures.

Method used

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  • Negative electrode material and lithium ion battery containing same
  • Negative electrode material and lithium ion battery containing same
  • Negative electrode material and lithium ion battery containing same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0068] [Preparation method of negative electrode material]

[0069] The present invention also provides a method for preparing the above-mentioned negative electrode material, the method comprising the steps of:

[0070] (1) In an inert atmosphere, the graphite is ball milled to obtain the first intermediate product;

[0071] (2) In an inert atmosphere, the silicon oxide block is ball-milled to obtain a second intermediate product;

[0072] (3) dissolving the aromatic polymer into the solvent, and mixing uniformly to obtain the first mixture;

[0073] (4) mixing the first intermediate product, the second intermediate product and the first mixture to obtain a second mixture;

[0074] (5) drying the second mixture to obtain a third intermediate product;

[0075] (6) The third intermediate product is put into a high-speed fusion machine, fully fused to obtain the fourth intermediate product;

[0076] (7) Sintering the fourth intermediate product at high temperature in an iner...

Embodiment 1～8

[0096] The preparation method, parameters and physical and chemical properties of the negative electrode material are exemplarily given below.

[0097] Embodiments 1-8 adopt the following steps to prepare the negative electrode material:

[0098] (1) Under an inert atmosphere, the graphite is ball-milled to obtain a first intermediate product.

[0099] Described graphite is the artificial graphite that does not do coating treatment, obtains by commercial purchase, and its Dv50 is about 17.45 μ m, and BET is about 3.03m 2 / g, the Dv50 of the first intermediate product is about 11.8 μm.

[0100] (2) Dilute silica powder and silicon powder by SiO 2 / Si mass ratio is 1.15 (corresponding to embodiment 1~4) or 3.38 (corresponding to embodiment 5~8) to mix, obtain mixture;

[0101] at 10 -5 Under the pressure of MPa and the temperature of 1150 ° C, the mixture was reacted for 6 hours to generate gas;

[0102] condensing the gas to obtain silicon oxide blocks;

[0103] In an ine...

Embodiment 9-18 and comparative example 6-10

[0160] The lithium ion batteries of Examples 9-16 and Comparative Examples 6-10 were prepared by using the negative electrode materials of Examples 1-8 and Comparative Examples 1-5, respectively.

[0161] The full battery production method is as follows:

[0162] The negative electrode materials, sodium carboxymethylcellulose, styrene-butadiene rubber, and Super P of Examples 1-8 and Comparative Examples 1-5 were mixed according to a mass ratio of 96.5:1.6:1.6:0.3, deionized water was added, and The negative electrode slurry is obtained under the action of a stirrer. The negative electrode slurry is evenly coated on a copper foil with a thickness of 8 μm, and the surface density of the negative electrode slurry coated on the surface of the negative electrode current collector is about 5.0 mg / cm 2 . The copper foil was transferred to an oven at 80° C. to dry for 12 hours, and then rolled and cut to obtain a negative electrode sheet.

[0163] Lithium cobaltate (LCO), polyviny...

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Abstract

The invention discloses a negative electrode material and a lithium ion battery containing the negative electrode material. The negative electrode material comprises graphite and silicon oxide particles attached to the surface of the graphite, the surface of the graphite contains unsaturated bonds; the silicon oxide particles are composed of a substance with a general formula of SiOx (x is greater than or equal to 0 and less than or equal to 2) and have an amorphous structure, and the maximum particle size of the silicon oxide particles is less than 0.5 [mu] m; at least one part of the surfaces of the graphite and the silicon oxide particles contains a coating, and the coating is a high-temperature carbonization product of an aromatic polymer. The graphite and the silicon oxide particles are coated with the high-temperature carbonized product of the aromatic polymer, so that the lithium intercalation kinetics of the negative electrode material can be improved, and the prepared lithium ion battery has high constant-current charge ratio, low cyclic lithium precipitation risk and good high-temperature storage performance.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a negative electrode material and a lithium ion battery containing the negative electrode material. Background technique [0002] In recent years, the requirements for the charging rate of lithium-ion batteries have been continuously improved, and correspondingly higher requirements have been put forward for the lithium intercalation speed of negative electrode materials. How to increase the lithium intercalation speed of the negative electrode material and make it have high structural stability during the cycle is one of the key technical issues facing the research and development of fast-charge lithium-ion batteries. [0003] Graphite has a sheet structure, and its adjacent carbon atoms in the same layer are sp 2 The form of hybridization forms covalent bonds, and the different layers are combined by weak van der Waals force, and the distance between the sheets...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/48H01M4/36H01M10/0525
CPCH01M4/62H01M4/628H01M4/366H01M4/583H01M4/483H01M10/0525
Inventor 范洪生李素丽刘春洋陈若凡李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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