Negative electrode material, preparation method thereof and multilayer electrode

A negative electrode material, multi-layer electrode technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of reducing the cycle life of the negative electrode, affecting the interface stability, and wrinkling the electrode surface.

Active Publication Date: 2020-08-14
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem of wrinkling on the electrode surface of the single-layer electrode sheet of the traditional silicon-based anode material, which affects the stability of the interface and reduces the cycle life of the anode.

Method used

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  • Negative electrode material, preparation method thereof and multilayer electrode

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preparation example Construction

[0030] A preparation method of a negative electrode material is one of the preparation methods of the above-mentioned negative electrode material, and the preparation method of the negative electrode material comprises the following steps:

[0031] Step S110: Mix SiOx, graphite, porous carbon and pitch, and then granulate at 400°C-600°C to obtain a negative electrode material precursor, wherein x is 0.1-2.

[0032] Among them, the bitumen has good fluidity at 400°C to 600°C, which is conducive to the full and uniform dispersion of raw materials.

[0033] Wherein, the granulation time is 0.5h-5h.

[0034] Among them, SiO x The mass of the negative electrode material is 5wt%-80wt% of the total mass of the negative electrode material. Furthermore, SiO x The mass of the negative electrode material is 20wt%-60wt% of the total mass of the negative electrode material. Specifically, SiO x The median particle size D 50 1 μm to 10 μm. More specifically, SiO x The median particle...

Embodiment 1

[0106] The preparation steps of the multilayer electrode of the present embodiment are as follows:

[0107] (1) 20g SiO, 80g artificial graphite (single particle), 1g pitch, 0.1g carbon black, 0.1g porous carbon, 0.1g single-arm CNT slurry (wherein CNT content 0.2wt%, CMC content 0.3wt%, solvent Nitromethylpyrrolidone (NMP 99.5wt%) was mechanically stirred and mixed for 2h, then calcined at 500°C for 4h, cooled and then dispersed, and then calcined at 1000°C for 3h to obtain the negative electrode material.

[0108] (2) Get 97.8g artificial graphite (secondary particle, D50 12 μm), get 1g carbon black, get 0.1g porous carbon, get 10g polyimide binder (content 10wt%), add 60g NMP to stir, and coat Distributed on the current collector to obtain the first material layer, the coating surface density is 45mg / 1540.25mm 2 .

[0109] (3) Take 95g of negative electrode material, 1g of carbon black, 0.1g of porous carbon, 0.1g of single-arm CNT slurry, 30g of polyimide binder, add 60g...

Embodiment 2

[0113] The preparation steps of the multilayer electrode of the present embodiment are as follows:

[0114] (1) 20g SiO, 80g artificial graphite (single particle), 1g pitch, 0.1g carbon black, 0.1g porous carbon, 0.1g single-arm CNT slurry (wherein CNT content 0.2wt%, CMC content 0.3wt%, solvent Nitromethylpyrrolidone (NMP 99.5wt%) was mechanically stirred and mixed for 2h, then calcined at 500°C for 4h, cooled and then dispersed, and then calcined at 1000°C for 3h to obtain the negative electrode material.

[0115] (2) Get 90g artificial graphite (secondary particle, D50 12 μ m), get 1g carbon black, get 4g porous carbon, get 40g polyimide binding agent (content 10wt%), add 60g NMP to stir, and coat on The current collector obtains the first material layer, and the coating surface density is 61mg / 1540.25mm 2 .

[0116] (3) Take 70g of negative electrode material, 1g of carbon black, 10g of porous carbon, 50g of single-arm CNT slurry, 100g of polyimide binder, add 60g of NMP...

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Abstract

The invention relates to a negative electrode material, a preparation method thereof and a multilayer electrode. The negative electrode material is prepared from the following raw materials: SiOx, graphite, porous carbon and asphalt, and x is 0.1-2. The negative electrode material comprises SiOx, graphite, porous carbon and amorphous carbon, a low-expansion graphite layer and the porous carbon cover the surface of SiOx, the graphite layer can buffer volume expansion of SiOx, and meanwhile, the porous carbon has a certain pore volume, so that SiOx expansion is reduced, the electrode surface wrinkling phenomenon is overcome, the interface stability is improved, and the cycle life of the negative electrode is prolonged; and meanwhile, SiOx has relatively high gram volume, so that the energy density of the electrode can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a negative electrode material, a preparation method thereof and a multilayer electrode. Background technique [0002] As people's requirements for the cruising range of electric vehicles are getting higher and higher, the energy density of passenger car battery systems needs to be continuously improved. Traditional graphite anodes can no longer meet the current energy density requirements of power batteries. Due to the high gram capacity of silicon-based anodes, silicon-based anodes have become key research materials. However, there is a problem of wrinkling on the electrode surface of the single-layer electrode sheet of the traditional silicon-based anode material, which affects the stability of the interface and reduces the cycle life of the anode. Contents of the invention [0003] Based on this, it is necessary to provide an anode material that can improve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M4/62H01M4/13H01M10/0525
CPCH01M4/366H01M4/483H01M4/583H01M4/621H01M4/13H01M10/0525H01M2004/027Y02E60/10
Inventor 陈鹏褚春波张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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