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A Rapid Method for Evaluating the Dispersibility of Lithium-ion Battery Slurries

A lithium-ion battery, dispersive technology, applied in analytical materials, instruments, measuring devices, etc., can solve problems such as strong experience dependence, poor data reliability, and many uncontrollable factors in evaluation data, and achieve the optimal batching process. Effect

Active Publication Date: 2018-12-14
ZHONGTIAN ENERGY STORAGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The literature survey found that the existing reported methods for evaluating the dispersion uniformity of lithium-ion battery slurry exist: (1) The time cost is long, and real-time monitoring is not possible; (2) There are many uncontrollable factors in the evaluation data, and the data reliability is poor ; (3) Strong experience dependence, unable to evaluate slurry dispersion uniformity with a quantitative index

Method used

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  • A Rapid Method for Evaluating the Dispersibility of Lithium-ion Battery Slurries
  • A Rapid Method for Evaluating the Dispersibility of Lithium-ion Battery Slurries
  • A Rapid Method for Evaluating the Dispersibility of Lithium-ion Battery Slurries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] It is used to evaluate the dispersion of a certain capacity lithium iron phosphate. The carbon content of lithium iron phosphate is 1.4%. The formula is: lithium iron phosphate: polyvinylidene fluoride: conductive carbon black: conductive graphite = 93:3:3:1 , the theoretical carbon content of the evenly dispersed slurry is: 6.39%

[0027] Sampling and testing the slurry dispersed for 2 hours: take four samples from the upper, middle and lower layers of the slurry tank respectively, then dry according to the above steps, and conduct a carbon content test. The test data are as follows:

[0028]

[0029] It can be seen from the above data that there are obviously data with a carbon content higher than or lower than 6.39% in the data, which can prove that there are a lot of agglomerated SP and KS-6 in the slurry that have not been dispersed, resulting in the dispersion of the slurry at different positions. Carbon content varies widely.

Embodiment 2

[0031] It is used to evaluate the dispersion of a certain capacity lithium iron phosphate. The carbon content of lithium iron phosphate is 1.4%. The formula is: lithium iron phosphate: polyvinylidene fluoride: conductive carbon black: conductive graphite = 93:3:3:1 , the theoretical carbon content of the evenly dispersed slurry is: 6.39%

[0032] Sampling test is carried out to this slurry after dispersing 6 hours, and data is as follows:

[0033]

[0034] It can be seen that the gap between the carbon content of the slurry after dispersing for 6 hours and the theoretical carbon content becomes smaller, and the dispersion between the data is also improved, and the standard deviation is reduced. The data shows that the dispersibility of the slurry dispersed for 4 hours is improved, but the agglomeration of the conductive agent still exists in the local area.

Embodiment 3

[0036] It is used to evaluate the dispersion of a certain capacity lithium iron phosphate. The carbon content of lithium iron phosphate is 1.4%. The formula is: lithium iron phosphate: polyvinylidene fluoride: conductive carbon black: conductive graphite = 93:3:3:1 , the theoretical carbon content of the evenly dispersed slurry is: 6.39%

[0037] Sampling test is carried out to this slurry after dispersing 8 hours, and data is as follows:

[0038]

[0039] It can be seen that the carbon content of the slurry dispersed for 8 hours is basically close to the theoretical carbon content, and the consistency between the data is also very good, the standard deviation is significantly reduced, and the slurry dispersion is basically uniform.

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Abstract

The invention discloses a method for rapidly evaluating dispersity of lithium-ion battery slurry. The dispersity of the lithium-ion battery slurry is evaluated rapidly through steps of sampling, a drying test and comparison with a parallel sample. The method has the advantages as follows: the method is used for evaluating the dispersity of the slurry without limitation to single carbon and is applicable to slurry dispersion uniformity detection and blending technology optimization in blending processes of any easy-to-measure elements. The method is applicable to evaluation of slurry dispersity in the blending processes of multiple materials, particularly applicable to slurry uniformity detection and blending technology optimization during blending of multiple materials including anode materials such as lithium iron phosphate, lithium ferromanganese phosphate, a nickel, cobalt and aluminum ternary material, a nickel, cobalt and manganese ternary material, a lithium-rich material, mixtures of lithium iron phosphate, lithium ferromanganese phosphate, the nickel, cobalt and aluminum ternary material, the nickel, cobalt and manganese ternary material and the lithium-rich material and the like as well as cathode materials such as lithium titanate, silica, alloy anodes and the like; the method is not limited to the lithium-ion battery industry and is suitable for slurry uniformity detection and blending technology optimization in the blending processes in any industries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery production, and in particular relates to a method for quickly evaluating the dispersibility of lithium ion battery slurry. Background technique [0002] In recent years, with the increasingly severe environmental problems, new energy technologies have ushered in the spring of development. Among many new energy technologies, lithium-ion batteries have developed vigorously due to their high specific energy, long life and many other advantages. However, in the actual manufacturing of lithium-ion batteries, there are still many problems that need to be solved urgently. The safety and consistency of batteries have always been difficult issues that plague the battery industry. To solve the problem of battery consistency, we must start with the source ingredients of battery production. Ingredients are the first step in the production of lithium-ion batteries, and they are also the basis for e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00
CPCG01N33/00
Inventor 连林靳承铀郑媛媛薛驰缪永华赵映军
Owner ZHONGTIAN ENERGY STORAGE TECH
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