70% of the battery quality is related to the quality of the pole piece, and 70% of the quality of the pole piece is related to the quality of the slurry. Therefore, a good slurry is equivalent to half of a battery. Homogenization is the first and core task of battery manufacturing. There is also a well-known domestic expert who said: The battery process in the laboratory is often more refined than the commercial battery process, except for the homogenization process. This also shows that homogenization is also a difficulty in battery manufacturing.
The main purpose of lithium ion battery slurry dispersion is to uniformly disperse active materials, conductive agents, adhesives, etc. in a solvent according to a certain mass ratio to form a stable slurry with a certain viscosity for the coating of pole pieces. The purpose of the lithium-ion battery pulping process is to prepare for film production. The requirements of the pole piece for the ideal slurry: (i) The particles of the active material are small and uniformly dispersed without agglomeration, and the conductive agent particles form a thin layer to disperse into a conductive network, and interlock and connect the particles of the active material on the current collector to the greatest extent (ii) The material particles are best to be small to ensure that the battery has a high current density.
At present, the mainstream homogenization equipment used by lithium-ion battery manufacturers is a double planetary mixer. The dual planetary mixer used in the lithium battery industry, also called PD mixer, is equipped with a low-speed stirring component, a planetary mixer and a high-speed dispersion plate. The low-speed mixing components are two bending frame-type mixing paddles, which are driven by planetary gears. The paddles also rotate when they revolve, so that the material can move up and down and around, so as to achieve the ideal mixing effect in a short time. The high-speed dispersing part is generally a dentition dispersing disc, which revolves together with the planet carrier, and at the same time rotates at a high speed, so that the material is subjected to strong shearing and dispersion. Its effect is several times that of ordinary mixers. The dispersing parts are divided into single-dispersion shaft and double-dispersing shaft. Disperse axis.
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