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Preparation process of lithium battery electrode plate

An electrode pole piece and preparation process technology, applied in the field of lithium battery electrode pole piece preparation technology, can solve problems such as uneven mixing, pole piece cracking, complex process, etc., to improve safety, reduce proportion, and save workshop area effect

Active Publication Date: 2021-11-05
CHINA AUTOMOTIVE INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention solves the problems of uneven mixing of positive electrode materials and cracking of the electrode sheet, the positive electrode material needs to be coated with carbon first, and there is a problem of complicated process

Method used

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  • Preparation process of lithium battery electrode plate
  • Preparation process of lithium battery electrode plate
  • Preparation process of lithium battery electrode plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Batching 100g, wherein at first 92g ternary 523 (LiNi 0.5 co 0.2 mn 0.3 o 2), 4g conductive agent (graphene and SP mass ratio 1:1) were added to the mixer, stirred at low speed (600rpm) for 8-10min, mixed evenly, then added 4g polytetrafluoroethylene, stirred at high speed (20000rpm) for 10-20s, stopped 1-2min, and then stir for 10-20s to fully fiberize PTFE; add 5g (mass ratio 20:1) auxiliary isoparaffin solvent oil (commercially available, boiling point 114°C), stir at high speed (20000rpm) for 10s to fluffy (like marshmallow). Put the mixed flocculent mixture into a mortar and roll it into shape, then put it into a roller press, roll it hot at 80°C to form a film, and roll it to a certain compaction density to form a self-supporting pole piece film ( see figure 1 ), dried in a vacuum oven at 120°C for 8 hours to remove additives, and finally hot-pressed with a current collector to obtain a positive electrode sheet.

[0034] like figure 1 , is a self-supporting...

Embodiment 2

[0037] Ingredients 100g, among which first add 94g ternary 523, 4g conductive agent (graphene and Ketjen black mass ratio 1:1) into the mixer, stir at low speed (800rpm) for 8-10min, mix well, then add 2g polytetrafluoroethylene , stir at high speed (25000rpm) for 10-20s, stop for 1-2min, and then stir for 10-20s to fully fiberize the polytetrafluoroethylene; add 5g (mass ratio 20:1) of petroleum ether, stir at high speed (25000rpm) for 10s until the flocculation shape. Put the mixed flocculent mixture into a mortar and roll it into shape, then put it into a roller press, roll it hot at 80°C to form a film, and roll it to a certain compaction density to form a self-supporting pole piece film. Dry in a vacuum oven at 120°C for 8 hours to remove additives, and finally hot press with a current collector to obtain a positive electrode sheet.

Embodiment 3

[0039] The ingredients are 100g, among which 96g of ternary 523 and 2g of conductive agent (SP) are first added to the mixer, stirred at a low speed (800rpm) for 8-10min, mixed evenly, then added 2g of polytetrafluoroethylene, stirred at a high speed (25000rpm) for 10-20s, Stop for 1-2min, then stir for 10-20s to fully fiberize the PTFE; add 5g of absolute ethanol, stir at high speed (25000rpm) for 10s until flocculent. Put the mixed flocculent mixture into a mortar and roll it into shape, then put it into a roller press, roll it hot at 80°C to form a film, and roll it to a certain compaction density to form a self-supporting pole piece film. Dry in a vacuum oven at 120°C for 8 hours to remove additives, and finally hot press with a current collector to obtain a positive electrode sheet.

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Abstract

The invention discloses a preparation process of a lithium battery electrode plate. The preparation process comprises the following steps: firstly, uniformly mixing an electrode active material, a conductive agent and a binder to obtain a mixture; adding an auxiliary agent into the mixture, and mixing to obtain a flocculent mixture, wherein the auxiliary agent is absolute ethyl alcohol, petroleum ether, cyclohexanone or solvent oil, or a mixture of the absolute ethyl alcohol, the petroleum ether, the cyclohexanone and the solvent oil and the flocculent mixture is prepared into a self-supporting pole piece membrane through hot rolling; and drying the pole piece film to remove the auxiliary agent, and performing hot-pressing compounding on the pole piece film and a current collector to obtain the electrode pole piece. According to the invention, the powder is directly mixed, a proper auxiliary agent is added to form a flocculent mixture, then the flocculent mixture is rolled, the electrode material is uniformly mixed, and the binder is fiberized sufficiently, so that a uniform, flexible and compact self-supporting membrane is obtained, and the self-supporting membrane is compounded with the current collector to obtain the electrode plate.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a preparation process of an electrode material, in particular to a preparation process of a lithium battery electrode pole piece. Background technique [0002] At present, the positive and negative pole pieces of lithium-ion batteries are generally prepared by wet process, that is, the homogenate coating process is used to prepare battery pole pieces. Before the production of pole pieces, it is necessary to dissolve the binder (positive electrode PVDF, negative electrode CMC+SBR) in a solvent or dispersant (positive electrode N-methylpyrrolidone NMP, negative electrode deionized water), and then mix it with a stirring device to mix the conductive agent, The electrode active material is uniformly dispersed into a flowable slurry. After the slurry is prepared, it is transported to the coating equipment for slurry coating; in the process of coating and preparing pole pieces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04H01M4/62H01M10/052
CPCH01M4/139H01M4/0433H01M4/621H01M4/625H01M10/052Y02E60/10
Inventor 刘张波赵嫣然胡康嵇书伟
Owner CHINA AUTOMOTIVE INNOVATION CORP
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