Detecting method and device for lithium ion cell material

A lithium-ion battery and material testing technology, which is applied in the direction of measuring devices, material analysis through electromagnetic means, and material analysis, can solve the problems of large deviation of results, long cycle, and inaccuracy

Inactive Publication Date: 2006-11-08
王宏栋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Both of these test methods have flaws and cannot be suitable for testing real raw materials
The test method of the simulated battery can only roughly reflect the performance of the tested material, but not accurate; the test method of the finished battery is too long, laborious, and affected by the control of the manufacturing process, the deviation of each result is too large, it is difficult to Repeat experiment results

Method used

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  • Detecting method and device for lithium ion cell material
  • Detecting method and device for lithium ion cell material
  • Detecting method and device for lithium ion cell material

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0028] Electrode Preparation Method 2

[0029] see figure 1 , the conductive agent, the binder, and the solvent are formulated into a positive electrode slurry according to the required ratio, and coated on a single surface of the aluminum foil 4 to make the above negative electrode 12, and cut into the size shown in the figure. see figure 2 , the conductive agent, binder, and solvent are made into a negative electrode slurry according to the required ratio, and coated on a single surface of the copper foil 5 to make the above positive electrode 14, and cut into the size shown in the figure. These conductive agents, binders, and solvents will vary due to testing different technical indicators.

[0030] After the positive electrode slurry and the negative electrode slurry are dried under high temperature to remove the solvent, they become the positive electrode active material 15 and the negative electrode active material 17 respectively, and are attached to the surfaces of ...

Embodiment 1

[0040] Example 1: Testing the limit gram specific capacity of the negative electrode material

[0041] Definition: "Limited gram specific capacity" refers to the capacity charged per gram of pure negative electrode material when the negative electrode material of the lithium ion battery is completely filled with lithium ions in the interlayer space without dendrite lithium precipitation.

[0042]The manufacturing method of the research electrode (negative electrode): 10 g of polyvinylidene fluoride (PVDF) was dissolved in N-methyl-2-pyrrolidinedione (NMP), and 100 g of the tested negative electrode graphite powder was added. A slurry-like negative electrode slurry is uniformly prepared by high-speed stirring, and the negative electrode slurry is coated on a single surface of a copper foil with a thickness of 20 microns. Dry at 120°C to remove N-methyl-2-pyrrolidinedione (NMP), the thickness of the electrode strip is controlled at 160±10 microns, the thickness of the electrode ...

Embodiment 2

[0051] Example 2: Testing of Limit Failure Gram Specific Capacity of Lithium-ion Battery Cathode Material

[0052] "Limited failure gram specific capacity of positive electrode material" refers to the capacity released when each gram of pure positive electrode material is discharged when the lithium ions in the interlayer space of the positive electrode material of the lithium ion battery are completely released (the crystal structure of the positive electrode material is completely destroyed at this time). .

[0053] Manufacturing method of auxiliary electrode (negative electrode): Dissolve 10g polyvinylidene fluoride (PVDF) in N-methyl-2-pyrrolidinedione (NMP), then add 3g Super-P, and finally add 100g Negative electrode graphite powder. A slurry-like negative electrode slurry is uniformly prepared by high-speed stirring, and the negative electrode slurry is coated on a single surface of a copper foil with a thickness of 20 microns. Dry at 120°C to remove N-methyl-2-pyrrol...

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Abstract

This invention relates to a test method for Li ionic battery materials, which utilizes a test device including a battery-like device, a sampling system and a computer control analysis system and includes the following steps: 1, assembling and connecting the battery-like device, the sampling system and the computer control analysis system, in which, the sampling system can collect voltage and current variance data between the positive and negative, the voltage variance data between the positive, negative and the assistant poles, the computer analysis system can control the charge/discharge between the positive and the negative and analyze data got by the sampling system, 2, the computer system controls the operation of the charge and discharge, 3, the sampling system collects several test data and the computer system stops charging and discharging when the data reach to the close condition of the test, 4, the computer system analyzes data of the sampling system to get the necessary result.

Description

technical field [0001] The invention relates to a test method and a test device for the electrochemical performance of lithium ion battery materials, in particular to a test method and a test device for a three-electrode system using positive and negative auxiliary electrodes. Background technique [0002] For the production of lithium-ion batteries: the stability of raw materials is a prerequisite for stable product quality. From the perspective of production control conditions: the five factors of "man, machine, material, method, and environment" determine the overall quality of the product. "Ring" refers to the overall environment of production and manufacturing. With the guarantee of auxiliary equipment, the production environment can be relatively stable. "Person" refers to the operator, "machine" refers to the equipment required for production and the operation and use of the equipment, "material" refers to the raw material for product manufacturing, and "method" refe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/403G01R31/36
CPCH01M10/0525H01M10/48H01M12/085H01M2010/4271H01M2010/4278Y02E60/10
Inventor 王宏栋
Owner 王宏栋
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