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Cathode slurry for improving overbaking defect of high areal density cathode pole plate of lithium battery

A technology of negative pole piece and negative electrode slurry, which is used in battery electrodes, secondary batteries, and secondary battery repair/maintenance, etc. It is not easy to volatilize and other problems, and achieves the effect of improving overbaking defects, improving kinetic process, and reducing uneven tension

Inactive Publication Date: 2019-03-26
上海力信能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the additive ethylene carbonate in this method has a melting point of 35-38°C and a boiling point of 248°C. It is solid at room temperature. It needs to be melted at high temperature in advance as an additive, and it is not easy to volatilize. Re-condensation affects the flexibility and uniformity of the pole piece
In addition, this method does not mention the surface density information of the coating, and the cracking and edge curling of the pole pieces are often more likely to occur during the high surface density coating process

Method used

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  • Cathode slurry for improving overbaking defect of high areal density cathode pole plate of lithium battery
  • Cathode slurry for improving overbaking defect of high areal density cathode pole plate of lithium battery
  • Cathode slurry for improving overbaking defect of high areal density cathode pole plate of lithium battery

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Embodiment 1

[0028] The invention discloses a negative electrode slurry for improving the over-baking defect of a high surface density negative electrode sheet of a lithium battery, comprising a basic slurry and a surface tension regulator. The basic slurry includes solid components and liquid components. The solid components are graphite (ie, negative electrode active material), SP (ie, conductive agent), SBR (ie, binder), and CMC (ie, thickener). The ratio is 96.5:0.5:1.8:1.2, and the liquid component is water. The surface tension regulator is dimethyl carbonate, and the addition amount is 1% of the mass of the solid component.

[0029] Mix CMC and water evenly to make an aqueous solution with a mass concentration of 1.2%, add it to the mixed powder of graphite and SP, stir and disperse evenly according to the process regulations, then add dimethyl carbonate to continue stirring, and adjust the viscosity of the slurry with water to SBR was added after 4000-5000 mPa·s to obtain negative ...

Embodiment 2

[0033] The invention discloses a negative electrode slurry for improving the over-baking defect of a high surface density negative electrode sheet of a lithium battery, comprising a basic slurry and a surface tension regulator. The basic slurry includes solid components and liquid components. The solid components are graphite (ie, negative electrode active material), SP (ie, conductive agent), SBR (ie, binder), and CMC (ie, thickener). 97:0.5:1.5:1.0 ratio, the liquid component is water. The surface tension regulator is diethyl carbonate, and the addition amount is 3% of the mass of the solid component.

[0034] Mix CMC and water evenly to make an aqueous solution with a mass concentration of 1.2%, add it to the mixed powder of graphite and SP, stir and disperse evenly according to the process regulations, then add diethyl carbonate to continue stirring, and adjust the viscosity of the slurry with water to SBR was added after 4000-5000 mPa·s to obtain negative electrode slurr...

Embodiment 3

[0038] The invention discloses a negative electrode slurry for improving the over-baking defect of a high surface density negative electrode sheet of a lithium battery, comprising a basic slurry and a surface tension regulator. The basic slurry includes solid components and liquid components. The solid components are graphite (ie, negative electrode active material), SP (ie, conductive agent), SBR (ie, binder), and CMC (ie, thickener). The ratio is 96.0:1.0:1.8:1.2, and the liquid component is water. The surface tension regulator is diethyl carbonate, and the addition amount is 7% of the mass of the solid component.

[0039] Mix CMC and water evenly to make an aqueous solution with a mass concentration of 1.2%, add it to the mixed powder of graphite and SP, stir and disperse evenly according to the process regulations, then add diethyl carbonate to continue stirring, and adjust the viscosity of the slurry with water to SBR was added after 4000-5000 mPa·s to obtain negative el...

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Abstract

The invention discloses cathode slurry for improving overbaking defect of a high areal density cathode pole plate of a lithium battery. The cathode slurry comprises basic slurry and a surface tensionadjustor. The basic slurry comprises a solid component and a liquid component. The solid component comprises a cathode active substance, a conducting agent, a binder and a thickener. The surface tension adjustor is one of or any combination of Cathode slurry for improving overbaking defect of high areal density cathode pole plate of lithium battery, diethyl carbonate and ethyl methyl carbonate. The adding amount of the surface tension adjustor is 1-10% by mass of the solid component. By improving the cathode slurry, the surface tension adjustor is added to adjust the interfacial tension in a homogenating process to improve the overbaking defect of the high areal density cathode pole plate of the lithium battery. The cathode slurry is still suitable for a process of raising the drying temperature in a high areal density cathode pole plate coating process, and the original production efficiency and coating speed are kept. The selected surface tension adjustor is stable in property, low in boiling point and small in residue amount. The yield of the pole plate is improved greatly and the electrochemical performance of a product battery cell is improved greatly.

Description

technical field [0001] The invention relates to a negative electrode slurry of a lithium ion battery, in particular to a negative electrode slurry for improving over-baking defects of a high surface density negative electrode sheet of a lithium battery. Background technique [0002] Due to its high specific capacity, small self-discharge, wide operating temperature range, high voltage platform, long cycle life, no memory effect, and environmental friendliness, lithium-ion batteries have been widely used in electric vehicles, energy storage, digital electronic products, etc. field. [0003] In recent years, with the continuous popularization of electric vehicles and the rapid development of the energy storage industry, this has put forward higher requirements for the performance of lithium-ion batteries, further improving battery capacity, and at the same time having good safety and long service life. common goals of the people. The most common way to increase the capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/42H01M10/0525
CPCH01M4/62H01M10/0525H01M10/4235Y02E60/10
Inventor 陈周昊高远鹏陈启多朱清程君
Owner 上海力信能源科技有限责任公司
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