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Negative electrode active material, negative electrode sheet and battery

A negative electrode active material, silicon oxide technology, applied in the direction of active material electrodes, batteries, negative electrodes, etc., can solve the problems of large thickness rebound, affecting battery cycle stability and cycle life, volume expansion, etc., to achieve good electrical contact, Effect of improving cycle stability and cycle life

Active Publication Date: 2021-12-28
CONTEMPORARY AMPEREX TECH CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, silicon is valued because it has a theoretical gram capacity more than ten times higher than that of graphite, but silicon has a serious volume effect, and a huge volume expansion will occur during charging.
Therefore, the thickness of the negative electrode sheet made of silicon as the negative electrode active material rebounds greatly during battery use and the porosity of the negative electrode sheet is also high, so that the structure of the negative electrode sheet gradually changes from the initial dense state to loose and porous. state, the conductive network of the negative electrode sheet is damaged, and the electrical contact between the negative electrode active materials becomes poor, which seriously affects the cycle stability and cycle life of the battery.

Method used

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  • Negative electrode active material, negative electrode sheet and battery
  • Negative electrode active material, negative electrode sheet and battery

Examples

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preparation example Construction

[0058] (1) Preparation of positive pole piece

[0059] Mix positive electrode active material NCM811, conductive agent Super P, and binder polyvinylidene fluoride (PVDF) at a mass ratio of 96.8:2.2:1, add solvent N-methylpyrrolidone (NMP), and stir under the action of a vacuum mixer until The system is uniform, and the positive electrode slurry is obtained; the positive electrode slurry is evenly coated on the positive electrode current collector aluminum foil, and then the positive electrode current collector coated with the positive electrode slurry is dried at room temperature and then transferred to an oven to continue drying, and then cooled. Pressing and slitting to obtain the positive electrode sheet.

[0060] (2) Preparation of negative pole piece

[0061] Mix the negative electrode active material (see Table 1 for details), conductive agent Super P, thickener sodium carboxymethylcellulose (CMC), and binder styrene-butadiene rubber (SBR) in a mass ratio of 80:10:5:5 ...

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Abstract

The invention provides a negative electrode active material, a negative electrode sheet and a battery. The negative electrode active material includes a first silicon oxide and a second silicon oxide, wherein the ratio of the particle size Dn10 of the first silicon oxide to the particle size Dn10 of the second silicon oxide is 8-25, The particle size Dn10 of the first silicon oxide is 1.0 μm˜5.0 μm, and the particle size Dn10 of the second silicon oxide is 0.05 μm˜0.50 μm. In the present invention, two kinds of silicon oxides with a specific Dn10 range are selected for matching to control the thickness rebound of the negative electrode sheet, ensuring good electrical contact between the negative electrode active materials, thereby helping to improve the cycle stability and cycle life of the battery .

Description

technical field [0001] The invention relates to the field of batteries, in particular to a negative electrode active material, a negative electrode sheet and a battery. Background technique [0002] In recent years, due to the higher energy density requirements of the electric vehicle industry, a lot of research has been carried out around high-capacity negative electrode active materials. Among them, silicon has been valued because it has a theoretical gram capacity more than ten times higher than that of graphite, but silicon has a serious volume effect, and a huge volume expansion will occur during charging. Therefore, the thickness of the negative electrode sheet made of silicon as the negative electrode active material rebounds greatly during battery use and the porosity of the negative electrode sheet is also high, so that the structure of the negative electrode sheet gradually changes from the initial dense state to loose and porous. In this state, the conductive net...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/134H01M10/054H01M10/0525
CPCH01M4/364H01M4/483H01M4/134H01M10/054H01M10/0525H01M4/386H01M2004/021H01M2004/027H01M2220/20H01M10/052Y02E60/10
Inventor 曾毓群梁成都赵玉珍黄起森官英杰温严
Owner CONTEMPORARY AMPEREX TECH CO
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