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Method for judging specific surface area of lithium ion battery mixed slurry is qualified or not

A lithium-ion battery, specific surface area technology, applied in the direction of analysis of materials, instruments, etc., can solve the problems of uneven dispersion, affecting the battery process, plugging holes, etc., and achieve the effect of high feasibility, simple operation, and simple sample processing

Active Publication Date: 2018-02-02
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the battery material needs to be mixed before the subsequent process can be carried out. Conductive agents, binders and solvents are added to the slurry. If these materials are not properly processed in the slurry, agglomeration, uneven dispersion, and hole plugging may occur. Therefore, it is very important to test the specific surface area of ​​the battery material after mixing the slurry, but it is very difficult to test the specific surface area of ​​the slurry, and it is difficult to judge its ratio. Whether the surface area is qualified, how to invent a simple test method, which is very important for testing whether the specific surface area of ​​the slurry after the lithium-ion battery material is mixed is qualified or not

Method used

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  • Method for judging specific surface area of lithium ion battery mixed slurry is qualified or not

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Embodiment 1

[0020] A method for judging the qualified specific surface area of ​​a lithium-ion battery slurry is proposed by the present invention. The lithium-ion battery slurry includes lithium-ion battery powder materials and solvents, and the lithium-ion battery powder materials include positive or negative electrode materials and conductive agents. , binder, test the specific surface area data A and B of the lithium-ion battery slurry and the lithium-ion battery powder material respectively, and compare the ratio R with the qualified range R 0 Values ​​are compared to determine whether the specific surface area of ​​the lithium-ion battery slurry is qualified. To determine whether the specific surface area of ​​the lithium-ion battery slurry is qualified.

Embodiment 2

[0022] A method for judging the qualified specific surface area of ​​a lithium-ion battery slurry is proposed by the present invention. The lithium-ion battery slurry includes lithium-ion battery powder materials and solvents, and the lithium-ion battery powder materials include positive or negative electrode materials and conductive agents. , binder, comprise the following steps:

[0023] (1) Take the lithium-ion battery slurry and add it to a platinum crucible, then place it in a tube furnace, vacuum-dry it in an inert atmosphere, cool the tube furnace down to room temperature, obtain a dry sample, and take it out;

[0024] (2) vacuum degas the dry sample, detect its specific surface area, and record the test data A;

[0025] (3) Take lithium ion battery powder material, vacuum degassing, detect its specific surface area, record test data B;

[0026] (4) Calculate the R value according to the formula R=A / B*100%, and the qualified range R 0 The value is compared to judge wh...

Embodiment 3

[0028] The present invention proposes a method for judging that the specific surface area of ​​a lithium-ion battery slurry is qualified. The lithium-ion battery slurry is a lithium iron phosphate positive electrode slurry, including lithium-ion battery powder materials and a solvent. The judging method includes the following steps:

[0029] (1) Take the lithium iron phosphate positive electrode slurry of lithium ion battery and add it to a platinum crucible, then place it in a tube furnace, and carry out vacuum drying in an inert atmosphere. The drying temperature is 300 ° C, and the drying time is 3 hours. Cool down to room temperature to obtain a dry sample and take it out;

[0030] (2) Degas the dry sample in vacuum at 200°C, detect its specific surface area, and record the test data A;

[0031] (3) Take the lithium-ion battery powder material, degas it in vacuum at 300°C, detect its specific surface area, and record the test data B;

[0032] (4) Calculate the R value acc...

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Abstract

The invention discloses a method for judging the specific surface area of a lithium ion battery mixed slurry is qualified or not, and relates to the technical field of lithium ion batteries. The lithium ion battery mixed slurry comprises a lithium ion battery powder material and a solvent, and the lithium ion battery powder material comprises a positive or negative electrode material, a conductive agent and a binder. The method comprises the following steps: respectively testing the specific surface data A and B of the lithium ion battery mixed slurry and the lithium ion battery powder material, and judging the specific surface area of the lithium ion battery mixed slurry is qualified or not according to a ratio R. The change of the specific surface area of the lithium ion battery powder material before slurry mixing and the slurry after the slurry mixing is tested to roughly judge whether the raw material is abnormally clustered or not before and after the slurry mixing, so theimprovement of the slurry mixing and other related production technologies is facilitated. The judgment method has the advantages of simplicity in operation, simplicity in sample processing, and highfeasibility, and a preset qualified range R0 is obtained according to related technologic standards of lithium battery production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for judging the qualified specific surface area of ​​a lithium ion battery slurry. Background technique [0002] At present, the materials used in lithium-ion batteries mainly include: lithium iron phosphate positive electrode material, nickel-cobalt-manganese ternary positive electrode material, lithium titanate negative electrode material, graphite negative electrode material, etc. The specific surface area of ​​the battery material has a great influence on the battery performance, for example : The specific surface area of ​​lithium iron phosphate cathode material is too small, which may be caused by insufficient carbon coating, resulting in poor cycle performance of the battery. If the specific surface area is too large, it may be caused by excessive carbon coating or nano-scale particle size, resulting Materials are easy to agglomerate and difficult to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/00
CPCG01N15/00
Inventor 方婷婷王亚平
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY