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Silicon-carbon negative electrode slurry and preparation method and application thereof

A technology of negative electrode slurry and silicon carbon, which is applied in the direction of electrode manufacturing, battery electrodes, electrical components, etc., can solve the problems of limited improvement effect of silicon carbon negative electrode cycle performance, unsatisfactory application effect of soft pack cells, and unsatisfactory application effect , to achieve good cycle performance, shortened time, and easy dissolution

Inactive Publication Date: 2019-06-28
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most mature silicon-carbon bonding system is CMC / SBR, but the actual application effect of this bonding system in high specific energy cells is not ideal.
[0003] Some progress has also been made in the exploration of new bonding systems, including polyvinylidene fluoride, polytetrafluoroethylene, polyacrylic acid, polyvinyl alcohol, gelatin, cyclodextrin, chitosan, etc. It is reported in the literature, but the application effect in the soft package battery is not ideal
At present, conventional binder systems have limited effect on improving the cycle performance of silicon-carbon anodes; at the same time, the synthesis procedures of binders in some literatures are cumbersome and costly

Method used

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

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preparation example Construction

[0035] The present invention provides a method for preparing silicon-carbon negative electrode slurry described in the above technical solution, comprising the following steps:

[0036] a) preparing konjac gum glue;

[0037] b1) mixing the konjac gum glue and the conductive agent to disperse, then adding silicon carbon for pre-dispersion, then mixing with the binder and dispersing, adding water to adjust the viscosity and then sieving to obtain the silicon carbon negative electrode slurry;

[0038] Or, b2) konjac glue, binder and conductive agent are mixed and dispersed, then silicon carbon is added for pre-dispersion, water is added to adjust the viscosity, and the viscosity is sieved to obtain silicon carbon negative electrode slurry.

[0039] The present invention at first prepares konjac glue liquid. The present invention uses water as a solvent; more preferably deionized water. The mass fraction of the konjac gum liquid is 0.5%-5%. In a specific embodiment of the prese...

Embodiment 1

[0066] Raw material ratio of slurry: silicon carbon (92.6%); conductive carbon black (2.4%); SWCNTS single-walled carbon nanotubes (0.1%); konjac gum (2.1%); SBR (2.8%);

[0067] Slurry preparation process:

[0068] Gluing: Konjac gum (Henan Xingyuan Chemical Products Co., Ltd.) is prepared into a 3% glue solution with deionized water to ensure that there is no dry material agglomeration in the glue solution;

[0069] Conductive agent premixing: Take 80% of the total weight of the above-mentioned konjac glue, add conductive carbon black and SWCNTs in turn, stirring speed 20rpm, stirring time: 150min; dispersion speed 5000rpm, dispersion time 150min;

[0070] Pre-dispersion of silicon carbon negative electrode material: add silicon carbon negative electrode material, stirring speed 10rpm, stirring time: 30min; dispersion speed 500rpm, dispersion time 30min;

[0071] Dispersion of silicon carbon negative electrode material: Add the remaining konjac gum colloid and increase the ...

Embodiment 2

[0077] Raw material ratio of slurry: silicon carbon (91%); conductive carbon black (3.4%); SWCNTS single-walled carbon nanotubes (0.1%); konjac gum (2.6%); SBR (2.9%);

[0078] Slurry preparation process:

[0079] Gluing: Konjac gum (Henan Xingyuan Chemical Products Co., Ltd.) is prepared into a 3% glue solution with deionized water to ensure that there is no dry material agglomeration in the glue solution;

[0080] Conductive agent premixing: Take 80% of the total weight of the above-mentioned konjac glue, add conductive carbon black and SWCNTs in turn, stirring speed 20rpm, stirring time: 150min; dispersion speed 5000rpm, dispersion time 150min;

[0081] Pre-dispersion of silicon carbon negative electrode material: add silicon carbon negative electrode material, stirring speed 10rpm, stirring time: 30min; dispersion speed 500rpm, dispersion time 30min;

[0082] Dispersion of silicon carbon negative electrode material: Add the remaining konjac gum colloid and increase the st...

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Abstract

The invention provides silicon-carbon negative electrode slurry and a preparation method and application thereof. The slurry contains silicon carbon, a conductive agent, konjac gum and a binder, wherein the mass ratio of the silicon carbon to the conductive agent to the konjac gum to the binder is (91-96.5): (0.3-4.2): (1-3.8): (1.5-3). The konjac gum is adopted as a binder in a negative electrodeslurry system, has the thickening effect, and is low in cost. Moreover, an electrode piece prepared from the negative electrode slurry has good cycle performances. The binder is environment-friendlyand pollution-free. The preparation method of the silicon-carbon negative electrode slurry is simple, the konjac gum is easy to disperse and dissolve in water, and the time of the homogenizing procedure can be shortened. The capacity retention rate of a high-specific-energy soft-packaged battery cell prepared from the negative electrode plate containing the negative electrode slurry in 100 cyclesat 0.1C is higher than 85%, and the capacity retention rate of a high-specific-energy soft-packaged battery cell prepared from the negative electrode plate containing the negative electrode slurry in50 cycles at 0.2 C is higher than 80%.

Description

technical field [0001] The invention belongs to the technical field of silicon-carbon negative electrode materials, and in particular relates to a silicon-carbon negative electrode slurry, a preparation method and application thereof. Background technique [0002] Silicon carbon anode material is a high-quality specific capacity (4200mAh / g) and low lithium extraction potential (0.02-0.6V vs Li + / Li) electrode material has been regarded as a new type of energy storage material that may replace the traditional graphite anode material. At present, silicon-carbon anode materials are subject to practical problems such as high irreversible capacity, serious volume expansion, and poor cycle performance, which hinder their application and promotion in high specific energy batteries. The binder is one of the important factors affecting lithium-ion batteries, and its matching with the electrode material is directly related to the energy storage performance of the entire battery cell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/583H01M4/38H01M10/0525H01M4/04
CPCY02E60/10
Inventor 彭小强云亮刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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