Preparation device and preparation method of vertical structure electrode

Abstract

The invention belongs to the technical field of battery electrode preparation, and particularly relates to a preparation device and a preparation method of a vertical structure electrode. The preparation device comprises a bottom plate, a vertical stamping sheet and a horizontal pressing sheet, wherein the left side and the right side of the upper surface of the bottom plate are each provided witha supporting plate perpendicular to the upper surface of the bottom plate, a vertically-placed back plate is arranged on the rear surface of the bottom plate, the bottom plate, the supporting platesand the back plate are perpendicular to one another in pairs, a thickness adjusting plate capable of moving front and back is arranged between the two supporting plates, the thickness adjusting plateand the back plate are arranged in parallel, and the vertical stamping sheet and the horizontal pressing sheet are used for flattening a composite material placed between the back plate and the thickness adjusting plate. According to the invention, three methods of improving the energy density of the active substance, giving full play to the performance of the active substance and improving the proportion of the active substance are combined together to improve the energy density of the battery, and a wide application prospect is achieved in lithium ion battery preparation and other secondarybattery systems.

Description

technical field [0001] The invention belongs to the technical field of battery electrode preparation, and in particular relates to a preparation device and a preparation method of a vertical structure electrode. Background technique [0002] At present, the electrode sheets of lithium-ion batteries, including positive and negative electrodes, are mostly prepared by wet coating-drying-rolling-cutting process. Mix the powdered active material with the conductive agent and the binder in a certain proportion, grind it into a uniform slurry in a solvent, coat it on the current collector, remove the solvent by vacuum heating and drying, roll pressing and cutting to obtain the required electrode sheet . Inactive materials in electrode sheets, including conductive agents, binders and current collectors, account for 30-50% of the entire electrode mass, or even a higher proportion, which actually greatly reduces the energy density of the battery. [0003] Improving battery performan...

AI Technical Summary

Problems solved by technology

However, the use of this type of nano-array material must be used together with the base material, and the base material is generally a material with high density such as stainless steel plate, which accounts for a high proportion of the entire electrode.

In terms of increasing the proportion of active materials, the research on flexible electrodes has become a typical method, and the active materials are loaded on graphene, carbon nanotubes, carbon fibers or carbon cloth and used directly as electrode sheets. However, these loaded materials can also store lithium materials, but there are many The researchers did not take it into account, resulting in a falsely high energy density of the battery, and the serious voltage hysteresis of these loaded materials is not conducive to the practical application of flexible electrodes.

There are only one or two methods for improving the energy density of batteries in the research of the prior art, and there is no technology that combines the three to increase the energy density of batteries.

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