Lithium ion battery silicon oxygen anode paste, preparation method thereof, battery anode and lithium ion battery

A lithium-ion battery and negative electrode slurry technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of small particle size, large specific surface area, and difficult dispersion, and achieve high first effect and good dispersion , the effect of cycle stability

Pending Publication Date: 2019-06-28
SVOLT ENERGY TECH (MAANSHAN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem in the prior art that the particle size of silicon-oxygen negative electrode active material is small and the specific surface area is large, so it is not easy to disperse, resulting in the difficulty of preparing negative electrode slurry, the present invention provides a silicon-oxygen negative electrode slurry for lithium ion batteries and a preparation method thereof , the components in the negative electrode slurry are evenly dispersed without settling, ensuring that the performance of the slurry meets the use standards of lithium-ion battery negative electrode slurry

Method used

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  • Lithium ion battery silicon oxygen anode paste, preparation method thereof, battery anode and lithium ion battery
  • Lithium ion battery silicon oxygen anode paste, preparation method thereof, battery anode and lithium ion battery
  • Lithium ion battery silicon oxygen anode paste, preparation method thereof, battery anode and lithium ion battery

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preparation example Construction

[0046] Such as figure 1 As shown, the present invention also provides a preparation method of silicon-oxygen negative electrode slurry for lithium-ion batteries, comprising the following steps:

[0047] 1) Preparation of glue: Add appropriate amount of deionized water (accounting for 40%-80% of the volume of the stirred tank) in the stirred tank, add 1.5-1.8% solid content CMC (solid content=CMC quality / (CMC quality+deionized Water quality)), first stir at low speed for 30min, open the stirring tank for scraping if necessary, scrape the undispersed CMC powder sticky on the paddle and the kettle wall into the kettle; then stir at high speed for 60-90min, until the CMC is completely dissolved In the deionized water, a transparent and viscous CMC glue is formed; in this process, in order to prevent the temperature from being too high, the water can be turned on to cool the circulating water so that the temperature in the stirring tank does not exceed 40°C; take out the prepared C...

Embodiment 1

[0057] The main material of negative electrode slurry: gram capacity 420mAh / g silicon oxide negative electrode active material; the weight ratio of each component is negative electrode active material: SP: CMC: SBR (solid part) = 96: 1.0: 1.2: 1.8, that is, the weight of all materials is 100 In terms of parts, the negative electrode active material accounted for 96 parts, SP accounted for 1 part, CMC accounted for 1.2 parts, and SBR (solid part) accounted for 1.8 parts.

[0058] The particle size of the silicon-oxygen negative electrode active material described therein includes D10: 5 microns, D50: 11 microns, D90: 25 microns, and the ratio of the three is 1:0.3:0.2, and the specific surface area is 3.0m 2 / g, the tap density is 1.2g / cm 3 . According to the conversion of the ratio of D10:D50:D90 to weight percentage, D10: 66.67%, D50: 20%, D90: 13.33%, the degree of substitution of CMC A=0.5*66.67% / (20%+13.33%)= 1.0, the value range of K here is 0.5.

[0059] Further, the ...

Embodiment 2

[0068] The main material of the negative electrode slurry: the gram capacity of 500mAh / g silicon oxide negative electrode active material; the weight ratio of each component is the negative electrode active material: SP: CMC: PAA (solid part) = 95.0: 1.1: 1.4: 3.5, that is, the weight of all materials is 100 In terms of parts, the negative electrode active material accounted for 95.0 parts, SP accounted for 1.1 parts, CMC accounted for 1.4 parts, and PAA (solid part) accounted for 3.5 parts.

[0069] The particle size of the silicon-oxygen negative electrode active material described therein includes D10: 8 microns, D50: 16 microns, D90≤30 microns, and the ratio of the three is 1:0.5:0.2, and the specific surface area is 1.5m 2 / g, the tap density is 0.98g / cm 3 . According to the conversion of the ratio of D10:D50:D90 to the percentage by weight, D10: 58.82%, D50: 29.41%, D90: 11.77%, the degree of substitution of CMC A=0.9*58.82% / (29.41%+11.77%)= 1.32, the value range of K ...

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Abstract

The invention discloses a lithium ion battery silicon oxygen anode paste, a preparation method thereof, a battery anode and a lithium ion battery, and belongs to the technical field of lithium ion battery manufacture. The lithium ion battery silicon oxygen anode paste comprises deionized water and a solid material. The solid materials comprises, with 100 total parts by weight, 93 to 97 parts of silicon-oxygen anode active material, 1 to 2 parts of CMC, binder of 1.2 to 2.0 times the CMC, and 1 to 2 parts of conductive agent SP. The solid material of the anode paste uses the 93 to 97 parts silicon-oxygen anode active material instead of the conventional graphite and the like. The prepared silicon-based anode has a much higher gram capacity than that of the graphite anode. The gram capacityof the anode active material can be greatly adjusted by adjusting the silicon content. The lithium ion battery silicon oxygen anode paste has stable later cycle stability, and high first effect.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery production, and in particular relates to a lithium-ion battery silicon-oxygen negative electrode slurry and a preparation method thereof, a battery negative electrode and a lithium-ion battery. Background technique [0002] The negative electrode slurry is one of the main parts of the lithium-ion battery structure, and the quality of the battery test results depends on the characteristics of the negative electrode material itself. The determination of the negative electrode slurry also has a high standard for the raw material itself, and its conditions are as follows: (1) During the charging and discharging process, lithium ions move back and forth, which will have a certain impact on the volume, so it should have a layered or tunnel structure, there is no big change in the volume of lithium ions when intercalating and extracting; (2) redox reactions occur during the back and forth int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525H01M4/131
CPCY02E60/10
Inventor 罗倩李航徐强赵飞彭浩宋元哲
Owner SVOLT ENERGY TECH (MAANSHAN) CO LTD
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