Silicon-carbon negative electrode material slurry and preparation method thereof

A technology of negative electrode materials and silicon carbon materials, which is applied in the field of silicon carbon negative electrode material slurry and its preparation, can solve the problems of silicon carbon particle damage, poor graphite wrapping, and uneven dispersion, so as to prevent secondary agglomeration and improve the dispersion effect , Improve the effect of cycle life

Active Publication Date: 2020-02-28
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The uniformity of dispersion when silicon carbon is mixed with graphite will have a crucial impact on the performance of silicon carbon materials and the overall performance of the battery. It is easy to agglomerate, and there is a huge volume change when the silicon carbon material is charged and discharged, the dispersion is uneven, the graphite is not well wrapped, and the electrode sheet is prone to powder drop phenomenon. At the same time, the dispersion process will cause damage to the silicon carbon particles, resulting in the exposure of the silicon particles. Affect battery cycle performance

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  • Silicon-carbon negative electrode material slurry and preparation method thereof
  • Silicon-carbon negative electrode material slurry and preparation method thereof
  • Silicon-carbon negative electrode material slurry and preparation method thereof

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preparation example Construction

[0026] The preparation method of the silicon carbon negative electrode material slurry of the present invention comprises the following steps:

[0027] 1) According to the pulping ratio, add part of the CMC glue, all the conductive agent and all the silicon carbon particles, mix and wet at a low speed of 10-100 rpm for 10-100 minutes, and then disperse at a high speed of 2000-3000 rpm for 60- 180 minutes, obtain slurry 1;

[0028] 2) Add all the graphite materials to the slurry 1, mix and wet at a low speed of 10-100 rpm for 10-100 minutes, then disperse at a high speed of 2000-3000 rpm for 60-180 minutes to obtain slurry 2;

[0029] 3) Add the remaining CMC glue and part of the deionized water to the slurry 2, vacuumize, and disperse at a high speed of 2000-3000 rpm for 60-180 minutes to obtain the slurry 3;

[0030] 4) Add SBR binder with a solid content of 45% to the slurry 3, disperse at a high speed of 2000-3000 rpm for 20-90 minutes, add deionized water to adjust the vi...

Embodiment 1

[0040] 1) According to the mass ratio of silicon carbon, graphite, conductive agent, sodium carboxymethyl cellulose (CMC), and SBR 10:85:1:1.5:2.5, add carboxymethyl with a solid content of 1% accounting for 30% of the total glue amount Base cellulose sodium (CMC) glue 720g, conductive agent SP16g and core-shell silicon carbon particles 160g (900mAh / g), wherein the silicon carbon particle D50 is 15μm, first mix and wet at low speed at 10 rpm for 10 minutes, and then 2000 rpm high-speed dispersion for 60 minutes to obtain slurry 1;

[0041] 2) Then add 1360g of all graphite materials to the slurry 1, wherein the graphite particle D50 is 10 μm, mix and wet at a low speed of 10 rpm for 10 minutes, and then disperse at a high speed of 2000 rpm for 60 minutes, slurry 2;

[0042] 3) Add 1680g of remaining glue and deionized water to slurry 2, vacuumize at 2000 rpm and disperse at high speed for 60 minutes, slurry 3;

[0043] 4) Add 88g of binder SBR to the slurry 3, disperse at a h...

Embodiment 2

[0045] 1) According to the mass ratio of silicon carbon, graphite, conductive agent, sodium carboxymethylcellulose (CMC), and SBR of 20:70:6:2:2, add carboxymethyl, which accounts for 35% of the total glue amount and has a solid content of 1.5%. Cellulose sodium (CMC) glue 778g, conductive agent Ketjen black 100g and embedded silicon carbon negative electrode material 333g (600mAh / g), in which the silicon carbon particle D50 is 19μm, mixed and wetted at low speed at 10 rpm for 30 minutes , and then dispersed at a high speed of 2200 rpm for 100 minutes, slurry 1;

[0046] 2) Then add 1166g of all graphite materials to the slurry 1, wherein the graphite particle D50 is 10 μm, mix and wet at a low speed of 10 rpm for 30 minutes, and then disperse at a high speed of 2200 rpm for 100 minutes, slurry 2;

[0047] 3) Add 1444g of remaining glue solution and deionized water to slurry 2, vacuumize at 2200 rpm and disperse at high speed for 100 minutes, slurry 3;

[0048] 4) Add 74.07g ...

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Abstract

The invention provides silicon-carbon negative electrode material slurry and a preparation method thereof. The method comprises steps of 1) dividing CMC glue solution into two parts, and mixing a first part of the CMC glue solution with conductive agent and a silicon carbon material to obtain slurry 1; 2) adding a graphite material into the slurry 1, and dispersing the material to obtain slurry 2;3) adding a second part of CMC glue solution and the water into the slurry 2, vacuumizing, and dispersing the material to obtain slurry 3; and 4) adding SBR binder into the slurry 3, dispersing, sieving the slurry, and discharging bubbles to obtain silicon-carbon negative electrode material slurry. The method is advantaged in that the agglomeration phenomenon of the silicon-carbon particles in the pulping process is eliminated, that the graphite material uniformly wraps the silicon-carbon particles is guaranteed, and the overall cycle life of a battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a silicon-carbon negative electrode material slurry and a preparation method thereof. Background technique [0002] With the increasing demand for battery energy density in the current market, conventional graphite anode materials are no longer able to meet the growing requirements. Therefore, in recent years, silicon-carbon anode materials have been considered as anode materials for next-generation high-energy-density lithium-ion batteries due to their higher gram capacity, environmental friendliness, and abundant reserves. The uniformity of dispersion when silicon carbon is mixed with graphite will have a crucial impact on the performance of silicon carbon materials and the overall performance of the battery. It is easy to agglomerate, and there is a huge volume change when the silicon carbon material is charged and discharged, the dispersion is uneve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 范瑞娟田占元邵乐沈晓辉曹国林
Owner SHAANXI COAL & CHEM TECH INST
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