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A pole piece and its preparation method, lithium ion battery and preparation device

A technology for preparing devices and pole pieces, which is applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as increasing production costs, and achieve the effects of cost saving, uniform powder mixing, and simplification of processes

Active Publication Date: 2022-05-13
HUBEI JINQUAN NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solution is wet coating, which requires a long baking device to bake the coated electrode to remove the organic solvent and moisture in the electrode active material, which increases the production cost

Method used

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  • A pole piece and its preparation method, lithium ion battery and preparation device
  • A pole piece and its preparation method, lithium ion battery and preparation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The present embodiment prepares a cathode sheet according to the following method:

[0058] (1) The binder (polyvinylidene fluoride) is heated and liquefied at 150 °C to obtain a liquid binder;

[0059] (2) The liquid binder in step (1) with the electrode active material (lithium iron phosphate), conductive agent (conductive graphite) and auxiliaries (mass ratio 3: 7 dibutyl maleate and fat dibutyl carboxylate) gas flow rate of 320m / s high-speed gas flow to obtain a bonding product;

[0060] Wherein, the total mass of the liquid binder, electrode active material, conductive agent and auxiliary is 100%, the mass fraction of the liquid binder is 3%, the mass fraction of the electrode active material is 80%, the mass fraction of the conductive agent is 12%, and the mass fraction of the auxiliary is 5%;

[0061] (3) The bonding product of step (2) is multi-roller pressing (3 rollers, the size of each roller is increased successively from upstream to downstream along the trans...

Embodiment 2

[0067] The present embodiment prepares a cathode sheet according to the following method:

[0068] (1) The binder (hydroxymethyl cellulose CMC) is heated and liquefied at 200 °C to obtain a liquid binder;

[0069] (2) The liquid binder described in step (1) is mixed with the electrode active material (NCM811), conductive agent (carbon nanotubes) and auxiliaries (dibutyl maleicate with a mass ratio of 2:8 and dibutyl fatty dicarboxylate) to obtain a high-speed gas flow rate of 350m / s to obtain a bonding product;

[0070]Wherein, the total mass of the liquid binder, electrode active material, conductive agent and auxiliary is 100%, the mass fraction of the liquid binder is 1.5%, the mass fraction of the electrode active material is 98%, the mass fraction of the conductive agent is 0.3%, and the mass fraction of the auxiliary is 0.2%;

[0071] (3) The adhesive product of step (2) is multi-roller pressing (3 rollers, the size of each roller is increased successively from upstream to...

Embodiment 3

[0073] The present embodiment prepares a cathode sheet according to the following method:

[0074] (1) The binder (polyacrylic acid) is heated and liquefied at 50 °C to obtain a liquid binder;

[0075] (2) The liquid binder in step (1) with the electrode active material (NCM532), conductive agent (graphene) and auxiliaries (mass ratio 1:1 male butyl maleate dibutyl ester and fat dibutyl carboxylate) gas flow rate of 300m / s high-speed gas flow mixed granulation to obtain a bonding product;

[0076] Wherein, the total mass of the liquid binder, electrode active material, conductive agent and auxiliary is 100%, the mass fraction of the liquid binder is 5%, the mass fraction of the electrode active material is 70%, the mass fraction of the conductive agent is 15%, and the mass fraction of the additive is 10%;

[0077] (3) The adhesive product of step (2) is multi-roller pressing (4 rollers, the size of each roller is increased successively from upstream to downstream along the trans...

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Abstract

The invention discloses a pole piece, a preparation method thereof, a lithium ion battery and a preparation device. The method includes: 1) heating and liquefying the binder to obtain a liquid binder; 2) mixing and granulating the liquid binder with an electrode active material, a conductive agent and an auxiliary agent to obtain a bonded product; 3) The bonded product is subjected to multi-roll rolling to a set thickness, and then hot-pressed and solidified to the surface of the foil to obtain the pole piece, and the number of the multi-roll rolling is more than 2. The pole piece preparation method provided by the present invention is a method for preparing pole pieces by dry powder coating and solidification, which uses solvent-free mixing, reduces the use of organic solvents, and avoids environmental pollution; saves the process of drying the pole pieces in an oven, which can save costs; The dry process provided by the invention is beneficial to increase the capacity of the pole piece.

Description

Technical field [0001] The present invention belongs to the field of battery technology, relates to a polar plate and a preparation method thereof, a lithium-ion battery and a preparation apparatus. Background [0002] The coating of the existing lithium-ion electrode is wet coating, which is to mix the active material of the lithium-ion battery with the corresponding organic solvent, and then coat it to the substrate by direct coating or extrusion coating. In this way, a long baking device is required to bake the coated electrode to remove organic solvents and moisture from the electrode active substance. This organic solvent that is baked, if not recycled, is directly discharged into the air, which will cause pollution to the air, and if it is recycled, it will increase the cost of the user. [0003] The use of dry coating is conducive to increasing the content of active substances and is conducive to improving the battery capacity. There is a patent proposed, by adding additi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/13H01M4/139H01M10/0525B29C43/24
CPCH01M4/0435H01M4/13H01M4/139H01M10/0525B29C43/24Y02E60/10
Inventor 熊后高杜双龙师渝滔朱忠泗吕正中
Owner HUBEI JINQUAN NEW MATERIALS CO LTD