Double-roller extrusion coating production method of energy storage electrode

Abstract

The invention discloses a double-roller extrusion coating production method of an energy storage electrode. The method comprises an extrusion coating process. According to the extrusion coating process, an electrode material layer is extruded and formed on at least one side surface of a current collector strip by using an extrusion roller group. In the extrusion coating process, a roll gap betweentwo extrusion rolls is adjusted to a set range, and a stirred and dispersed electrode material to is added to the feeding sides of the two extrusion rolls; and the two extrusion rollers are driven torotate, the tangential speed of the extrusion rollers is made to be equal to the speed of the current collector strip passing through the space between the two extrusion rollers; the electrode material is extruded and applied on the current collector strip by utilizing the extrusion rollers to form an electrode material layer, so that the electrode strip can be obtained. According to the double-roller extrusion coating production method of the energy storage electrode, a simultaneous extrusion and coating forming mode is adopted, the extrusion thickness of the electrode material can be effectively controlled, the binding force between the electrode material and a strip is better, and the quality of a produced energy storage electrode is more stable.

Description

technical field [0001] The invention relates to a production method of an energy storage electrode, in particular to a production method of a double-roll extrusion coating of an energy storage electrode. Background technique [0002] The interior of a lithium battery is generally composed of positive electrode materials and their current collectors, negative electrode materials and their current collectors, electrolytes, separators, and casings. Among them, the content of the positive electrode material and the content of the negative electrode material are paired in a certain proportion to jointly determine the capacity of the battery, while other components only play the role of constituting the battery system and do not provide capacity itself. Under the premise that each component of the lithium battery has been determined, the only way to increase its energy density is to increase the proportion of the positive electrode material and the negative electrode material in t...

AI Technical Summary

Problems solved by technology

[0010] The lithium-ion battery positive electrode extrusion coating method uses extrusion to coat the positive electrode material on the current collector. Although it can meet the production requirements of the energy storage positive electrode, it is difficult to control the coating thickness of the positive electrode material in the extrusion process. That is to say, the amount of positive electrode material per unit area coated on the current collector is too much, exceeding the amount corresponding to the negative electrode material, which not only wastes materials, but also increases the weight of the battery and reduces the energy density of the battery.

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