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High-energy lithium battery cathode slurry and preparation method thereof

A negative electrode slurry and lithium battery technology, which is applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems that the adhesive cannot achieve the expected effect, the slurry is not uniform enough, and the viscosity of the negative electrode slurry is poor. Ensure slurry stability, improve cycle performance, and stabilize performance

Inactive Publication Date: 2019-06-14
山东高质新能源检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The negative electrode slurry of lithium batteries mainly includes active materials, conductive agents, binders and other additives. As part of the negative electrode slurry, the binder can make the negative electrode active materials bond together more uniformly, which is beneficial to improve the cycle of the battery. properties, while making the slurry viscous and evenly applied, but in the prior art, the binder in the negative electrode slurry of the battery cannot achieve the expected effect and the stability is poor, resulting in poor viscosity of the negative electrode slurry produced, so in the prior art The slurry is not evenly applied, which directly affects the performance of the battery

Method used

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Examples

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Embodiment 1

[0030] In an embodiment of the present invention, a negative electrode slurry for a high-energy lithium battery includes the following raw materials by weight percentage: negative electrode active material 40%, conductive agent 0.2%, binder 1%, defoamer 0.2%, polymer 2% additive, 2% dispersant additive, 0.6% thickener, 1% flame retardant, 5% buffer, and the balance is solvent.

[0031] Wherein, the negative electrode active material is composed of natural graphite, artificial graphite, and mesocarbon microspheres in a mass ratio of 1:2:1.

[0032] The conductive agent is composed of conductive carbon black, conductive graphite, graphene, acetylene black, conductive fiber, and carbon nanotubes in a mass ratio of 1:1:1:1:1:1.

[0033] The binder is sodium alginate, and the defoamer is ethylene carbonate EC.

[0034] The high polymer additive is alkanes, and the dispersing aid additive includes Tween 80 and Span 60, wherein the mass ratio of Tween 80 to Span 60 is 0.8:1.

[003...

Embodiment 2

[0045] In an embodiment of the present invention, a negative electrode slurry for a high-energy lithium battery includes the following raw materials by weight percentage: negative electrode active material 43%, conductive agent 0.4%, binder 2%, defoamer 0.3%, polymer 4% additive, 3% additive for dispersing, 0.8% thickener, 2% flame retardant, 8% buffer, and the balance is solvent.

[0046] Wherein, the negative electrode active material is natural graphite.

[0047] The conductive agent is composed of conductive carbon black, conductive graphite, and graphene in a mass ratio of 1:1:2.

[0048] The binder is sodium alginate, and the defoamer is ethanol.

[0049] The polymer additive is one of alkanes, olefins, and aromatics, and the dispersing additive includes Tween 80 and Span 60, wherein the mass ratio of Tween 80 to Span 60 is 1.2:1.

[0050]The thickener is formed by mixing styrene-butadiene rubber, polyacrylic acid, carboxymethyl cellulose, sodium carboxymethyl cellulos...

Embodiment 3

[0060] In an embodiment of the present invention, a negative electrode slurry for a high-energy lithium battery includes the following raw materials by weight percentage: negative electrode active material 46%, conductive agent 0.6%, binder 3%, defoamer 0.4%, polymer 6% additive, 4% additive for dispersing, 1% thickener, 3% flame retardant, 10% buffer, and the balance is solvent.

[0061] Wherein, the negative electrode active material is mesophase carbon microspheres.

[0062] The conductive agent is composed of acetylene black, conductive fibers and carbon nanotubes in a mass ratio of 1:1:1.

[0063] The binder is sodium alginate, and the defoamer is isopropanol.

[0064] The polymer additive is one of alkanes, olefins, and aromatics, and the dispersing additive includes Tween 80 and Span 60, wherein the mass ratio of Tween 80 to Span 60 is 1.6:1.

[0065] The thickener is formed by mixing styrene-butadiene rubber, polyacrylic acid, carboxymethyl cellulose, sodium carboxym...

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Abstract

The invention discloses high-energy lithium battery cathode slurry, and relates to the technical field of lithium battery production. The slurry mainly aims at solving the problems that the existing cathode slurry has poor viscosity, has insufficiently uniform smearing, and has a direct influence on the performance of a battery. The slurry comprises the following raw materials: a cathode active substance, a conductive agent, an adhesive agent, a defoaming agent, a high-polymer additive, a dispersing additive, a thickening agent, a flame retardant, a buffer solution and the balance of solvent.The invention further discloses a preparation method of the high-energy lithium battery cathode slurry. The high-polymer additive has ionic conductivity, so that the ionic conductivity of a cathode material can be improved; the charge transfer resistance can be reduced; and the rate capability of a lithium ion battery can be improved. The thickening agent is added by combination, so that various components can fully exert effects; the thickening agent can keep the stability of a molecular structure in a long-time standing process, and can keep the performance of the slurry stable; and agglomeration and sedimentation can be avoided.

Description

technical field [0001] The invention relates to the technical field of lithium battery production, in particular to a high-energy lithium battery negative electrode slurry and a preparation method thereof. Background technique [0002] "Lithium battery" is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. [0003] Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Li-ion batteries do not contain metallic lithium and are rechargeable. [0004] The negative electrode slurry of lithium batteries mainly includes active materials, conductive agents, binders and other additives. As part of the negative electrode slurry, the binder can make the negative electrode active materials bond together more uniformly, which is beneficial to improve the cycle of the battery. properties, while making the slurry viscous and evenly applied, but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M4/04H01M4/1393H01M10/0525
CPCY02E60/10
Inventor 周翔升王艺璇李知远王磊渐彬彬王珂袁伟
Owner 山东高质新能源检测有限公司
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