Precise grinding and polishing method for cathode roller

Abstract

The invention discloses a precise grinding and polishing method for a cathode roller. The method comprises the following steps of soaking a polishing wheel in pure water in a closed and dust-free grinding environment; sequentially carrying out surface rough grinding by adopting a polishing wheel with the particle size of 60 meshes and a polishing wheel with the particle size of 120 meshes; sequentially carrying out surface fine grinding by adopting a polishing wheel with the particle size of 320 meshes and a polishing wheel with the particle size of 600 meshes; cleaning the surface of the finely ground cathode roller; sequentially carrying out surface fine polishing on the cathode roller by adopting a polishing wheel with the particle size of 800 meshes and a polishing wheel with the particle size of 1000 meshes; and cleaning the surface of the cathode roller. The surface roughness of the cathode roller formed by the process is 0.2 <mu> m or below, the cathode roller has a certain mirror surface effect, the production operation period is long, and product crystals are compact.

Description

technical field [0001] The invention relates to the field of grinding and polishing, in particular to a method for precise grinding and polishing of a cathode roller. Background technique [0002] Lithium battery copper foil is the main material of lithium ion battery negative electrode current collector, its thickness, uniformity, physical properties, surface properties and other indicators directly affect the cycle performance, energy density and other indicators of lithium ion batteries. Since the surface of the cathode roll is the only substrate for copper foil crystal growth, the quality of the roll surface is not only directly related to the apparent quality of the smooth surface of the copper foil, but also indirectly affects the internal quality of the copper foil and the microscopic morphology of the rough surface, so the cathode The surface polishing quality and cleanliness of the roller are the key links in the production of copper foil. [0003] The traditional ...

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Problems solved by technology

[0003] The traditional grinding and polishing process is divided into two types. One uses pure water as the polishing liquid, uses PVA polishing wheels of different particle sizes (320 mesh, 600 mesh, and 800 mesh) as the working medium, and grinds and polishes under different pressures and different speeds. Although it can achieve a certain effect of smooth surface and low roughness of the cathode roller, in the copper foil production process, there are mainly problems such as rapid oxidation of the roller surface, short operating life, coarse crystallization of the copper foil, and difficulty in removing fine abrasives attached to the roller surface. Another kind of chemical polishing liquid is composed of an aqueous solution of organic matter, and the cathode roller is soaked in it, and the polishing brush of 1000 mesh abrasives is used to polish, and the grinding and polishing under a certain pressure and rotating speed mainly exist in the chemical polishing liquid to the titanium cathode roller. The surface wetting effect decreases, the ability to remove the oxide layer becomes weaker, the polishing effect is poor, the concentration of the chemical polishing solution is too high, it is easy to form residue on the cathode roller, it is difficult to clean, and it is easy to cause contamination of the raw foil solution system. The above two None of the methods can produce high-quality ultra-thin lithium battery copper foil products

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