Two-roll extrusion coating production method of energy storage electrode

Abstract

The invention discloses a double-roll extrusion coating production method of an energy storage electrode, comprising: an extrusion coating process, wherein an electrode material layer is extruded and formed on at least one side of a current collector strip by a extrusion roller group; In the extrusion coating process, the roller gap between the two extrusion rollers is adjusted to a set range, and the electrode material that has been stirred and dispersed is added to the feed side of the two extrusion rollers; the two extrusion rollers are driven to rotate. , and make the tangential velocity of the squeezing roll equal to the velocity of the current collector strip passing between the two squeezing rolls, and the electrode material is extruded and coated on the current collector strip by the squeezing roll and formed The electrode material layer is obtained to obtain an electrode strip. The double-roll extrusion coating production method of the energy storage electrode of the present invention adopts the method of extrusion and coating at the same time, which can effectively control the extrusion thickness of the electrode material, and the bonding force between the electrode material and the strip is better. The quality of the 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 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 shells. 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 the other components only play the role of constituting the battery system and do not provide capacity by themselves. On the premise that all components of a lithium battery have been determined, the only way to increase its energy density is to increase the proportion of positive electrode materials and negative electrode materials in the battery, an...

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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, the amount of positive electrode material per unit area coated on the current collector is too much, exceeding the amount required for the corresponding 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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