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Lithium ion battery slurry and assessment method of stability thereof

A lithium-ion battery and stability technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as inability to evaluate lithium-ion batteries, and achieve the effect of ensuring accuracy, reasonable stability, and accurate results

Inactive Publication Date: 2019-03-12
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot evaluate the positive and negative electrode pastes of Li-ion batteries separately

Method used

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  • Lithium ion battery slurry and assessment method of stability thereof
  • Lithium ion battery slurry and assessment method of stability thereof
  • Lithium ion battery slurry and assessment method of stability thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First weigh artificial graphite, acetylene black, CMC, and SBR according to the weight percentage of 93%: 2.5%: 1.0%: 3.5%, and then weigh the solvent deionized water according to the proportion of the glue solid content of 1.2%, and the stirring speed is 40 rpm Dispersion speed of 35 rpm, 3h to get a uniform and transparent glue; then add conductive agent acetylene black according to the stirring speed of 35 rpm, dispersion speed of 35 rpm, run for 1h; then add artificial graphite, according to the stirring speed of 35 RPM, dispersion speed 30 RPM, run for 4h; finally add SBR, according to stirring speed 35 RPM, disperse speed 40 RPM, run for 2h to get negative electrode slurry. The slurry viscosity is 4100mPa.s, and the solid content is 47%. After stirring, 0h, 3h, 6h, 9h, 12h, 15h, 18h, 21h, 24h, take out 150mL slurry from the upper and lower layers respectively, put them into numbered beakers, keep them sealed, and let them stand for 2h.

[0036] Ultrasonic ultraso...

Embodiment 2

[0044] First weigh artificial mixed natural graphite, acetylene black, CMC, SBR according to the weight percentage of 93%: 2.5%: 1.0%: 3.5%, and then weigh the solvent deionized water according to the proportion of the glue solid content of 1.2%, stirring speed 40 rpm, dispersion speed 35 rpm, 3h to get a uniform and transparent glue; then add conductive agent acetylene black according to stirring speed 35 rpm, dispersion speed 35 rpm, run for 1h; then add artificial graphite, stir according to The speed is 35 rpm, the dispersion speed is 30 rpm, and the operation is 4 hours; finally, SBR is added, and the stirring speed is 35 rpm, and the dispersion speed is 40 rpm, and the operation is 2 hours to obtain the negative electrode slurry. The slurry viscosity is 4200mPa.s, and the solid content is 46.5%. After stirring, 0h, 3h, 6h, 9h, 12h, 15h, 18h, 21h, 24h, take out 150mL slurry from the upper and lower layers respectively, put them into numbered beakers, keep them sealed, and...

Embodiment 3

[0050] First weigh nickel-cobalt-manganese (NCM111), SP-Li, PVDF according to the percentage by weight of 95%: 2.7%: 2.3%, and then take the solvent NMP according to the ratio of the glue solid content of 6.5%, stirring speed 40 rpm, The dispersion speed is 35 rpm, 3h to get a uniform and transparent glue; then add the conductive agent acetylene black according to the stirring speed of 35 rpm, the dispersion speed is 35 rpm, and run for 1h; then add nickel cobalt manganese (NCM111), according to the stirring The speed is 35 rpm, the dispersion speed is 30 rpm, and the positive electrode slurry is obtained by running for 4 hours. The slurry viscosity is 7500mPa.s, and the solid content is 68.2%. After stirring, 0h, 3h, 6h, 9h, 12h, 15h, 18h, 21h, 24h, take out 150mL slurry from the upper and lower layers respectively, put them into numbered beakers, keep them sealed, and let them stand for 2h.

[0051] Ultrasonic ultrasonic dispersion for 40s, the Zeta potential of the slurry ...

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Abstract

The invention discloses lithium ion battery slurry and an assessment method of stability thereof. The lithium ion battery slurry comprises battery negative slurry and battery positive slurry which arematched with each other; the battery negative slurry is prepared by adopting the following methods: respectively weighing artificial graphite or artificial mixed natural graphite, acetylene black, CMC and SBR, weighing solvent deionized water, firstly adding the CMC into the solvent deionized water, stirring and dispersing to obtain uniform and transparent glue solution; adding conductive agent acetylene black, stirring and dispersing; adding the artificial graphite to continuously stir; and finally adding SBR to stir to obtain the battery negative slurry. The method disclosed by the invention is simple in operation step, scientific, accurate in result, and capable of providing reference basis for the stability of the slurry.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion battery slurry and an evaluation method for its stability. Background technique [0002] Lithium-ion batteries have the characteristics of high specific capacity, high voltage platform, long-term cycle stability, safety and environmental friendliness, and have been gradually extended to the field of electric vehicles. Whether electric vehicles can achieve high energy density and long battery life depends largely on the performance of the lithium-ion batteries used. In the production process of lithium-ion batteries, the stability of positive and negative electrode pastes is an important factor in determining battery performance. [0003] The positive and negative electrode slurry is mainly a suspension dispersion system obtained by dispersing active materials, conductive agents, binders, solvents, etc. through high-speed stirring. The current commercial positive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/52H01M10/0525G01N15/02
CPCG01N15/0205H01M4/364H01M4/50H01M4/52H01M10/0525Y02E60/10
Inventor 伍成李文武周游胡阳鹏王耐清李小兵
Owner 桑顿新能源科技(长沙)有限公司
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