Method for assessing settleability and uniformity of lithium ion battery cathode slurry

Abstract

The invention discloses a method for assessing settleability and uniformity of lithium ion battery cathode slurry. The method comprises the following steps of taking samples from different positions of lithium ion battery cathode slurry, detecting solid contents of upper and lower layers in a centrifuge tube by a centrifugation method and assessing settleability and uniformity of the lithium ion battery cathode slurry according to relative standard deviation of the solid contents. The method has the advantages of simple processes, convenient operation, good reappearance, accurate data and high analysis efficiency and can be widely used in industries.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a method for evaluating the sedimentation and uniformity of the negative electrode material slurry of the lithium ion battery. Background technique [0002] Especially in today's period when new energy vehicles are attracting much attention, lithium-ion batteries are more and more widely used; the preparation method of lithium-ion battery negative electrode material slurry is to use the main components, such as graphite, conductive agent, binder, Solvents are added to the mixer in turn. Due to the large differences in physical properties such as specific gravity and specific surface among various materials, it is difficult to prepare the lithium-ion battery negative electrode material slurry uniformly even if it is pre-mixed with a mixer, and sedimentation and unevenness are prone to occur. As a result, the consistency of the coated pole piece is very poor, result...

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Problems solved by technology

[0002] Especially in today's period when new energy vehicles are attracting much attention, lithium-ion batteries are more and more widely used; the preparation method of lithium-ion battery negative electrode material slurry is to use the main components, such as graphite, conductive agent, binder, Solvents are added to the mixer in turn. Due to the large differences in physical properties such as specific gravity and specific surface among various materials, it is difficult to prepare the lithium-ion battery negative electrode material slurry uniformly even if it is pre-mixed with a mixer, and sedimentation and unevenness are prone to occur. As a result, the consistency of the coated pole piece is very poor, resulting in inconsistent internal resistance inside the cell, which in turn affects the performance of the lithium-ion battery, and the performance of a small lithium-ion battery is related to the product's performance, service life and Safety, etc., so strengthening the control from the source of lithium-ion battery production is the top priority

[0003] At present, most of the methods for testing the sedimentation and uniformity of the negative electrode material slurry of lithium-ion batteries adopt the visual method or take a certain amount of negative electrode material slurry of lithium-ion batteries and put them for a period of time to observe their sedimentation and uniformity. The test results are not accurate. Reliable, and the test takes a long time, so a better method is needed to evaluate the settling and uniformity of the negative electrode material slurry of lithium-ion batteries

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