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Method for making lithium ion cell positive electrode sheet, positive-electrode sheet and lithium ion cell

A lithium ion battery and a manufacturing method technology, applied in the field of material chemistry, can solve the problems of insufficient adhesion between positive electrode materials and aluminum foil, hard aluminum foil, and inability to obtain positive electrode sheets, so as to be beneficial to industrial application and promotion, and to achieve excellent sheet adhesion. The effect of bonding effect and excellent coating performance

Inactive Publication Date: 2009-07-01
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But, adopt the method that people such as R.Dominko proposes, there is following defect when producing positive pole piece by conventional large-scale production equipment: (1) the adhesive force between positive pole material and aluminum foil is not enough, especially when single-sided coating, material drop The phenomenon is serious; (2) Gelatin is used as a binder to make the aluminum foil with positive electrode slurry appear harder, which is not as soft as polyvinylidene fluoride (PVDF) binder; (3) Only gelatin cannot be used to obtain a positive electrode sheet with a qualified surface density , that is, a sufficiently thick positive electrode sheet cannot be obtained because the molecular weight of gelatin is too low (molecular weight ranges from 1 to 25,000)
Due to the presence of more emulsifiers in this type of polymer, it will have a certain impact on the performance of the battery to varying degrees; in addition, the viscosity of this type of polymer latex is low, which is a problem in the preparation of positive and negative electrode slurry and coating process. Unfavorable factors, resulting in low areal density of pole piece

Method used

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  • Method for making lithium ion cell positive electrode sheet, positive-electrode sheet and lithium ion cell
  • Method for making lithium ion cell positive electrode sheet, positive-electrode sheet and lithium ion cell
  • Method for making lithium ion cell positive electrode sheet, positive-electrode sheet and lithium ion cell

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1. Using SBR as auxiliary adhesive, PEO as thickener, LiCoO 2 : Conductive agent: Gelatin: SBR:PEO=100:2:1:1:0.5 Ingredients.

[0041] First, dissolve 10g of gelatin in 350ml of purified water to obtain a gelatin solution, then completely dissolve 5g of PEO (molecular weight: 250,000) in 350ml of purified water, mix the prepared 350ml of gelatin solution with 1000g of dried LiCoO 2 Pour the positive electrode material powder (manufactured by CITIC Guoan Company) into a small egg beater, stir at 2000 rpm for half an hour, then add 20g of conductive agent Super P to the above mixture in 3 batches, continue stirring at high speed for 2 hours, and wait for the slurry to After roughly mixing, add 10 grams of SBR and the prepared PEO solution, and stir for another 3 hours, then the slurry preparation is completed. After evacuating in a vacuum drying oven for 1 hour, and passing through a 150-mesh sieve, the coating can be carried out. Lithium-ion batteries contai...

Embodiment 2

[0042] Embodiment 2, each proportioning and preparation method are basically the same as Embodiment 1, except that the thickener is changed to polyvinylpyrrolidone with a molecular weight of 250,000. Lithium-ion batteries containing cathode sheets fabricated using the method described above performed essentially as well as conventional oil-phase-coated batteries.

Embodiment 3

[0043] Embodiment three, using acrylonitrile-butadiene latex as auxiliary adhesive, polyvinyl alcohol as thickener, press LiCoO 2 : conductive agent: gelatin: acrylonitrile-butadiene latex: polyvinyl alcohol = 100:2:1:6:0.1 ingredients.

[0044] First, 10g of gelatin was dissolved in 450ml of pure water to obtain a gelatin solution, then 1g of polyvinyl alcohol (molecular weight: 450,000) was completely dissolved in 220ml of pure water, and the prepared 450ml of gelatin solution and 1000g of dry LiCoO 2 Pour the positive electrode material powder (manufactured by CITIC Guoan Company) into a small egg beater, stir at 2000 rpm for half an hour, then add 20g of conductive agent Super P to the above mixture in 3 batches, continue stirring at high speed for 2 hours, and wait for the slurry to After roughly mixing, add the prepared polyvinyl alcohol solution and 60 grams of acrylonitrile-butadiene latex, and stir for another 3 hours, then the preparation of the slurry is completed. ...

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Abstract

The method includes working procedure for preparing pulp in water phase. The procedure includes step for mixing materials i.e. mixing materials of powder particles of active material of positive pole, current conducting agent, and binding material of current conducting agent evenly to produce pulp in paste form. The binding material is in use for adhering current conducting agent onto surface of powder particles of active material of positive pole. Thickening agent and assistant binding material are added to the mixing step. The thickening agent is in use for adjusting viscosity of mixed pulp. The assistant binding material is in use for raising adhesive bonding performance, as well as improving flexibility of pole pieces. The invention also discloses method for preparing positive pole pieces and lithium ion batteries. The invention reduces influence on electrochemistry capability of battery caused by binding material utilized in aqueous adhesive bonding in current technique.

Description

【Technical field】 [0001] The invention relates to the field of material chemistry and high-energy battery technology, in particular to a method for manufacturing a positive electrode sheet of a lithium ion battery, and also relates to a positive electrode sheet of a lithium ion battery manufactured by the method and a lithium ion battery using the positive electrode sheet. 【Background technique】 [0002] Lithium-ion battery is a high-performance secondary battery, which has the advantages of high working voltage, high volume and weight energy density, long life, low self-discharge rate, no memory effect and good for the environment. It is widely used in mobile communication equipment, Notebook computers, camcorders, personal digital assistants (PDA), digital cameras, electric tools, torpedoes, missiles and other fields. In recent years, lithium-ion battery manufacturing technology has made great progress, which has greatly improved the capacity of the battery. However, as f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/62H01M4/48H01M4/58H01M10/38H01M10/40H01M4/505H01M4/525H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 林云青陈泽伟任灿高旭
Owner ZHENGZHOU BAK BATTERY CO LTD
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