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A kind of laminated flexible electrode sheet and preparation method thereof

A flexible electrode and pole piece technology, applied in the field of electrochemistry, can solve the problems of low capacity and insufficient cycle of lithium batteries, and achieve the effects of improving flexibility, improving thickness and increasing energy density

Active Publication Date: 2020-05-15
柔电(武汉)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium battery is an energy storage device that provides power for wearable devices. It must be able to be folded and bent arbitrarily, and can be made into various shapes and sizes. It is light in weight, high in energy density, easy to use and easy to carry. Physical and chemical properties, structure, size, quality (weight), etc. have all put forward special requirements. At present, the capacity of lithium batteries used in wearable devices is generally low, and the cycle performance is insufficient.

Method used

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  • A kind of laminated flexible electrode sheet and preparation method thereof
  • A kind of laminated flexible electrode sheet and preparation method thereof
  • A kind of laminated flexible electrode sheet and preparation method thereof

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preparation example Construction

[0034] The preparation method of the laminated flexible electrode sheet in the present invention includes the following steps:

[0035] (1) Dispersion: Use organic solvent or deionized water as the solvent for the conductive agent, and ultrasonically disperse at a dispersion concentration of 0.1-2mg / ml to form a conductive agent slurry; use organic solvent or deionized water as the solvent for the fiber body, high speed Stirring dispersion, the dispersion concentration is 0.5-3mg / ml; among them, the organic solvent is ethanol, ethylene glycol, propanol, N-methylpyrrolidone, isopropanol.

[0036] (2) Stir and homogenize: add the binder to the conductive agent slurry in step (1) and disperse for 2 to 3 minutes, then add the active material, mix thoroughly, and then add the fibers dispersed in step (1) And then mix thoroughly to form a suspension slurry.

[0037] (3) Pour the suspended slurry obtained in step (2) into a suction filter device containing filter paper. The filter paper is...

Embodiment 1

[0042] In this embodiment, the active material is lithium cobalt oxide, the fiber material is nanocellulose, the conductive agent is carbon nanotubes, the mass ratio of the three is 99.7:0.1:0.2, and the area density of the active material is 20 mg / cm. 2 . First, disperse nanocellulose in isopropanol at high speed, disperse carbon nanotubes in isopropanol ultrasonically for 20 minutes, with a volume ratio of 0.6 mg / ml. After dispersion, add lithium cobalt oxide to the conductive agent slurry and disperse at high speed for 10 minutes. After mixing uniformly, add the dispersed nano cellulose, and continue to stir at high speed to form a uniform suspension slurry. Then, pour the suspension slurry into a cellulose filter paper with a pore size of 2 microns for vacuum filtration. Remove the isopropanol to form a film. The sample after the film is baked in a 130 degree oven to remove the remaining isopropanol, and the dried self-supporting pole piece substrate can be easily transferre...

Embodiment 2

[0045] In this embodiment, the active material is lithium manganate, the fibrous material is nanocellulose, the conductive agent is graphene, and the cushion material is nanocellulose. The mass ratio is 89:5:5:1. The surface of the active material is The density is 15mg / cm 2 . First, disperse the fibrous material at high speed in N-methyl-2-pyrrolidone (NMP). The carbon nanotubes are dispersed in NMP ultrasonically for 10 minutes at a volume ratio of 0.5mg / ml. Add lithium manganate to the conductive agent slurry and disperse it at high speed for 6 minutes until uniformly mixed, then add the dispersed fiber material, and continue to stir at high speed to form a uniform suspension slurry; secondly, combine the cushion material and N-methylpyrrolidone at high speed Disperse for 5min, with an areal density of 1mg / cm 2 Prepare the cushion suspension, then pour the cushion suspension into a cellulose filter paper with a pore size of 50 microns for vacuum filtration. When the cushion ...

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Abstract

The invention provides a laminated type flexible electrode plate. The laminated type flexible electrode plate comprises a plurality of layers of electrode plate substrates, wherein the multiple layers of electrode plate substrates are laminated; the two adjacent electrode plate substrates are adhered and fixed by conductive silver glue; each electrode plate substrate comprises a fiber body, an active matter, an adhesive and a conductive agent; each fiber body is nanometer fiber or polydendritic crystal fiber, and the diameter of each fiber body is in nanometer level or sub-micrometer level; each active matter, each adhesive and each conductive agent are dispersed into the corresponding fiber body; each active matter is positive electrode material or negative electrode material of a lithium ion battery. The laminated type flexible electrode plate has the advantages that the fiber body is used as a support body of the active matter, so that the flexibility of the electrode plate is improved, the stress types, such as bending, tension and deformation, can be endured, the capacity reduction and voltage mutation due to bending are avoided, the damage to the internal structure of the battery is avoided, and the potential safety hazards are avoided; the multiple layers of electrode plate substrates are rolled into a whole structure, so that the surface density of the electrode plate is greatly increased, and the energy density of the lithium battery is further greatly improved.

Description

Technical field [0001] The invention belongs to the technical field of electrochemistry, and specifically relates to a laminated flexible electrode sheet and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery with high energy density, high reliability, good processing performance and excellent environmental performance. It has been widely used in various portable electronic devices. The existing lithium ion battery includes a positive electrode sheet, a separator, a negative electrode sheet, and an electrolyte that are superimposed and wound on each other. The separator is spaced between adjacent positive and negative electrodes to insulate the positive and negative sheets and to maintain the electrolyte. The outer layer is packaged with aluminum plastic film. [0003] In the preparation process, the positive and negative electrodes are first prepared into slurry, and then respectively coated on aluminum foil and copper foil to f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/04
CPCH01M4/0435H01M4/13H01M4/139Y02E60/10
Inventor 熊红波胡韬解明
Owner 柔电(武汉)科技有限公司