Method for measuring viscosity of lithium battery slurry online
A technology of slurry viscosity and lithium battery, which is used in measurement devices, viscometer maintenance, analysis of materials, etc., can solve problems such as inability to accurately reflect the viscosity characteristics of slurry, and achieve the effect of accurate response.
Inactive Publication Date: 2019-08-20
湖北锂诺新能源科技有限公司
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Problems solved by technology
However, the existing online viscosity measurement cannot accurately reflect the viscosity characteristics of the slurry due to the influence of online temperature and pressure. Taking temperature as an example, under normal temperature and pressure, a temperature change of 1°C can lead to a viscosity change of 5-10%, or even greater
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[0023] In order to better understand the present invention, the invention will be described in detail below in conjunction with the accompanying drawings and specific examples.
[0024] In order to solve the problem that there is a large deviation between the viscosity value of lithium battery slurry obtained by online measurement and the viscosity value measured offline, the present invention provides an online method for measuring the viscosity of lithium battery slurry, which is obtained through temperature compensation and viscosity correction. The viscosity of the lithium battery slurry has a high degree of coincidence with the viscosity value measured off-line, which can more accurately reflect the rheological properties of the lithium battery slurry. The preferred mode of the method for online measuring the viscosity of lithium battery slurry of the present invention will be described in detail below through specific examples.
[0025] The method for online measurement ...
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The invention relates to a method for measuring the viscosity of lithium battery slurry online. The method comprises the following steps that: 1) the measured viscosity f(T) of the lithium battery slurry and the temperature T DEG C of the lithium battery slurry are measured through a viscosity meter; 2) the online viscosity temperature compensation value delta eta of the lithium battery slurry iscalculated through a formula (1) and a formula (2), wherein the formula (1) delta eta=eta(25)-eta(T), and the formula (2) eta(T)=191443.5-15645.13T+439.62T<2>-4.315T<3>; 3) the temperature compensation viscosity eta'(T) of the lithium battery slurry is calculated, wherein the formula (3) eta'(T)=f(T)+delta eta; and 4) the temperature compensation viscosity is corrected through a formula (4), so that corrected viscosity eta'(T) is obtained, wherein the formula (4) eta'(T)=2.452 eta'(T)-1433.272. According to the method of the invention, a viscosity value obtained through temperature compensation and viscosity correction and a viscosity value obtained through offline measurement have a high coincidence degree.
Description
technical field [0001] The invention relates to the field of viscosity measurement, in particular to a method for online measurement of viscosity of lithium battery slurry. Background technique [0002] The pulping process is an important link in the production of lithium-ion batteries, which has a great impact on the final quality of the batteries. The lithium battery pulping process is to uniformly disperse electrode active materials, conductive agents, adhesives, thickeners, etc. in a solvent according to a certain formula, and make a slurry for coating process. Viscosity is an important performance index of lithium battery slurry. When the viscosity of the slurry is too high, it will cause coating difficulties, severe serrations on the edge of the aluminum foil, etc., and when the viscosity is too low, a stable coating layer cannot be formed. The slurry viscosity needs to be monitored in real time. In actual production, samples are usually taken regularly in the slurry...
Claims
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CPCG01N11/00G01N2011/0013
Inventor 马卫孙伟兵张天赐华诚陈刚杨梢江长清陈中华
Owner 湖北锂诺新能源科技有限公司