Method and system for detecting dispersity of coating slurry of coating film

• Main Authors: ZHUANG ZHI, CHENG YUE, HU YUANYUAN, BAO JINZHEN, YUAN KAIJIE, LIU QIANQIAN
• Format: Patent
• Language: Chinese; English
• Published: 22.06.2021
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention relates to the field of lithium battery diaphragm testing, in particular to a method for detecting dispersity of coating slurry of a coating film, which comprises the following steps: placing the coating film in an RC parallel circuit to serve as a resistor, establishing instantaneous voltage at two ends of the RC parallel circuit, monitoring a voltage drop [delta]U value in the RC parallel circuit, and judging the dispersity of the coating slurry according to a formula (1) and a formula (2), wherein [rho] is the resistivity of the coating film, [epsilon]0 is the absolute dielectric constant, [epsilon]r is the relative dielectric constant, d is the thickness of the coating, and S is the test area, the method evaluates the dispersity of the coating film slurry by measuring the value of the voltage drop of the coating film sample, and has the characteristics of simple method, good repeatability, accurate characterization effect, large test area and representative result. 本发明涉及锂电池隔膜测试领域，具体为一种涂布膜涂层浆