Method for testing mixing uniformity of positive electrode materials of lithium battery

A technology of mixing uniformity and positive electrode material, which is applied in the field of testing the mixing uniformity of positive electrode materials of lithium batteries, can solve the problems of complex test process and insufficient accuracy, and achieve the effect of simple test process and high accuracy.

Active Publication Date: 2019-05-17
东莞维科电池有限公司
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Problems solved by technology

[0003] CN102661911A discloses a method for quickly detecting the mixing uniformity of powder materials. First, understand the various properties of the mixed materials, then take samples after mixing, and then calculate the deviation value through calculation, and then evaluate according to the size of the deviation value. When the deviation When the value is not greater than 10%, it is considered that the material has been mixed evenly. If it is greater than 10%, it is necessary to continue mixing again, and then re-sampling and testing until the required deviation is reached; this scheme has the problems of complicated testing process and insufficient accuracy.
[0004] CN106404584A discloses a method for evaluating the uniformity of dry-mixing of lithium-ion battery powder, specifically adding dry powder materials and magnetic iron powder in the lithium-ion battery slurry to the mixer in turn for stirring; randomly taking out n parts of powder samples, each Each powder sample is weighed separately, and the magnetic ir

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  • Method for testing mixing uniformity of positive electrode materials of lithium battery
  • Method for testing mixing uniformity of positive electrode materials of lithium battery
  • Method for testing mixing uniformity of positive electrode materials of lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) The test method for the volatility of polyvinylidene fluoride under the theoretical ratio is to weigh the theoretical ratio of lithium cobaltate and polyvinylidene fluoride into the crucible without mixing, heat treatment at 600 ° C for 3 hours, and weigh the residual mass m 残 , calculate the volatilization rate V of polyvinylidene fluoride, the calculation formula is as follows:

[0055]

[0056] Repeat the above steps for 3 times and take the average value to obtain the volatilization rate of polyvinylidene fluoride under the theoretical ratio;

[0057] (2) Lithium cobalt oxide with a theoretical mass ratio of 99.8% and polyvinylidene fluoride with a theoretical mass ratio of 0.2% are mixed to obtain a mixture;

[0058] (3) The mixture obtained in step (2) is heat-treated at 600°C for 3 hours, and the residual amount M of the sample after heat treatment is weighed R , and calculate the measured mass ratio C of polyvinylidene fluoride in the mixture in conjunc...

Embodiment 2

[0061] (1) The volatility test method of the polyvinylidene fluoride under the theoretical proportion is the same as that of Example 1;

[0062] (2) Lithium cobalt oxide with a theoretical mass ratio of 99.19% and polyvinylidene fluoride with a theoretical mass ratio of 0.81% are mixed to obtain a mixture;

[0063] (3) The measured mass ratio of polyvinylidene fluoride in the mixture is C p The test calculation method is exactly the same as that of Example 1.

Embodiment 3

[0065] (1) The volatility test method of the polyvinylidene fluoride under the theoretical proportion is the same as that of Example 1;

[0066] (2) Lithium cobalt oxide with a theoretical mass ratio of 98.98% and polyvinylidene fluoride with a theoretical mass ratio of 1.02% are mixed to obtain a mixture;

[0067] (3) The measured mass ratio of polyvinylidene fluoride in the mixture is C p The test calculation method is exactly the same as that of Example 1.

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Abstract

The invention relates to a method for testing mixing uniformity of positive electrode materials of a lithium battery. The method comprises the following steps: mixing lithium cobalt oxide with polyvinylidene fluoride and then carrying out heat treatment, and testing the volatilization rate of the polyvinylidene fluoride in a theoretical sample, so as to obtain the measured mass ratio of the polyvinylidene fluoride at any position in the mixture; comparing the measured mass ratio with a theoretical mass ratio of the polyvinylidene fluoride in an added raw material; and if the difference of thecomparison is within +/-0.05%, thus the positive electrode materials are uniformly mixed, and if the difference of the comparison is outside +/-0.05%, thus the positive electrode materials are not uniformly mixed. The method is simple in test process, good in repeatability and high in accuracy, is used for the lithium battery preparation process and can effectively improve the preparation efficiency, and can provide a guiding direction for the design of the mixing process.

Description

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Claims

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Application Information

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Owner 东莞维科电池有限公司
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