Evaluation method of stability of lithium ion battery slurry

A technology of lithium ion battery and evaluation method, which is applied in the field of evaluation of the stability of lithium ion battery slurry, can solve the problems of low rigor and complexity of results, and achieve the effects of easy operation, easy mastery, and rapid detection process.

Pending Publication Date: 2018-11-20
余姚市海泰贸易有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems that the existing lithium-ion battery slurry stability evaluation method is too complicated and the results are not rigorous, and to provide a slurry stability evaluation method with simple operation, strong practicability and rigorous test results

Method used

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  • Evaluation method of stability of lithium ion battery slurry
  • Evaluation method of stability of lithium ion battery slurry
  • Evaluation method of stability of lithium ion battery slurry

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Embodiment

[0041] According to the operation steps of the above invention, nickel-cobalt lithium manganese oxide, ultrafine carbon powder and polyvinylidene fluoride are weighed, the mass percentages are 95.5%, 2.5% and 2.0% respectively, and the solvent is N-methylpyrrolidone. The above materials were stirred for 10 hours in a double planetary vacuum mixer to prepare positive electrode slurry.

[0042]Take about 450mL of slurry in a 500mL beaker, insert the piezoresistive pressure sensor probe vertically 1cm from the upper surface of the slurry, record the pressure value on the display screen, move the horizontal position, and record the pressure value on the display screen at this time, the same , continue to move the probe horizontally, and take 5 measurements on the same horizontal plane; continue to insert the pressure sensor probe vertically down 1cm, record the pressure value on the display screen, move the horizontal position, record the pressure value on the display screen at thi...

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Abstract

The invention provides an evaluation method of the stability of lithium ion battery slurry. Pressures of different positions in the slurry are detected by adopting a piezoresistive pressure sensor; the stability of the slurry is evaluated by using a pressure value difference caused by a density difference before and after the standing of the slurry. The evaluation method comprises the following steps: preparing the slurry; recording a depth value and a pressure value; recording multiple groups of depth values and pressure values; performing sealed standing and making a record; performing sealed standing and making records for multiple times; calculating a pressure value change rate; calculating a change rate of the pressure values of the slurry subjected to standing for different number oftimes relative to the pressure value of the freshly measured slurry, and evaluating the stability of the lithium ion battery slurry according to the change rate. The evaluation method provided by theinvention can reflect the stability of the lithium ion battery slurry comprehensively, accurately and objectively, saves resources, and is easy to operate, quick in detection process and high in efficiency.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a method for evaluating the stability of a lithium-ion battery slurry. Background technique [0002] Lithium-ion batteries have many advantages such as high specific energy, long cycle life, environmental protection and no pollution, and have become the new favorite in the field of new energy, and the preparation of lithium-ion batteries with excellent performance has become the goal of people in the lithium battery industry. When lithium-ion batteries are used in new energy vehicles such as electric vehicles, they are usually assembled with multiple sets of batteries, which puts high demands on the consistency of the batteries. In the manufacturing process of lithium-ion batteries, in view of the complex composition and system of the slurry, the stability and consistency of the slurry have a great impact on the performance of the battery, so looking for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/36
CPCG01N9/36
Inventor 贺泽跃易四勇
Owner 余姚市海泰贸易有限公司
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