Making method of lithium ion battery anode sheet

A lithium ion battery and a manufacturing method technology are applied in the field of lithium ion battery anode sheet manufacturing, which can solve the problems affecting the battery quality rate, poor low temperature performance of the lithium ion battery, easy demolding of the anode sheet, etc. The effect of reducing the number of defective films and reducing internal resistance

Active Publication Date: 2013-06-26
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to: aim at the deficiencies of the prior art, and provide a kind of manufacturing method of lithium-ion battery anode sheet, in order to improve the low-temperature performance of lithium-ion battery, improve battery efficiency at the same time, to overcome the method in the prior art The anode sheet is easy to demould, which affects the battery efficiency, and the low-temperature performance of the lithium-ion battery containing the anode sheet is poor

Method used

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  • Making method of lithium ion battery anode sheet
  • Making method of lithium ion battery anode sheet
  • Making method of lithium ion battery anode sheet

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Embodiment 1

[0025] Embodiment 1, a method for making an anode sheet of a lithium-ion battery provided in this embodiment includes the following steps: Step 1, preparation of anode slurry: anode active material natural graphite, aqueous thickener sodium carboxymethyl cellulose , Water-based adhesive styrene-butadiene latex and superconducting carbon are added into water according to the mass ratio of 96:1:1:2, and the anode slurry is prepared after being stirred evenly.

[0026] Step 2, fabrication of anode sheet: uniformly coat the anode slurry prepared in step 1 on the anode current collector copper foil with a coating thickness of 100um, and then dry in a drying oven at 100°C to prepare an anode sheet.

[0027] Step 3, post-processing of the anode sheet: place the anode sheet prepared in step 2 in a nitrogen environment at 300°C for 30 minutes of secondary baking and softening treatment, and then complete the production of the anode sheet after cold pressing and slitting.

Embodiment 2

[0028] Embodiment 2, the manufacturing method of a kind of anode sheet of lithium ion battery provided in this embodiment, comprises the following steps: Step 1, the preparation of anode slurry: anode active material artificial graphite, aqueous thickener lithium carboxymethyl cellulose 1. Water-based adhesive pure acrylic latex and acetylene black are added into water according to the mass ratio of 92:2:5:1, and the anode slurry is obtained after stirring evenly.

[0029] Step 2, fabrication of anode sheet: uniformly coat the anode slurry prepared in step 1 on the copper foil of the anode current collector with a coating thickness of 200um, and then dry it in a drying oven at 110°C to prepare the anode sheet.

[0030] Step 3, post-processing of the anode sheet: place the anode sheet prepared in step 2 in a nitrogen environment at 250°C for 40 minutes of secondary baking and softening treatment, and then complete the production of the anode sheet after cold pressing and slittin...

Embodiment 3

[0031] Embodiment 3, a method for manufacturing an anode sheet of a lithium ion battery provided in this embodiment includes the following steps: Step 1, preparation of anode slurry: anode active material silicon-carbon alloy, water-based thickener carboxymethyl cellulose Potassium, water-based adhesive styrene-acrylic latex and carbon nanotubes are added into water according to the mass ratio of 94:1.5:3:1.5, and the anode slurry is prepared after being stirred evenly.

[0032] Step 2, fabrication of anode sheet: uniformly coat the anode slurry prepared in step 1 on the copper foil of the anode current collector with a coating thickness of 50um, and then dry it in a drying oven at 90°C to prepare the anode sheet.

[0033] Step 3, post-processing of the anode sheet: place the anode sheet prepared in step 2 in a nitrogen environment at 350°C for 50 minutes of secondary baking and softening treatment, and then complete the production of the anode sheet after cold pressing and sli...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and especially relates to a making method of a lithium ion battery anode sheet. The method comprises the following steps: 1, anode slurry preparation: adding an anode active substance, an aqueous thickening agent, an aqueous adhesive and a conductive agent to water, and uniformly stirring to prepare an anode slurry; 2, anode sheet preparation: uniformly coating the anode slurry on an anode current collector, and drying in a 60-120DEG C drying box to prepare an anode sheet; and 3, anode sheet post-treatment: carrying out secondary baking softening treatment of the anode sheet obtained in step 2 in a 250-450DEG C environment. Compared with anode sheets made through the prior art, the anode sheet made through adopting the method has the characteristics of good flexibility, high absorption performance, low impedance and the like; and a lithium ion battery containing the anode sheet made through adopting method has the characteristics of good low temperature discharge performance, long cycle life, and low cycle thickness expansion rate.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for manufacturing an anode sheet of a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used as power sources for various mobile devices since their commercialization due to their many advantages such as high energy density, high operating voltage, no memory effect, long cycle life, and no pollution to the environment. At present, lithium-ion batteries have entered a large-scale practical stage. [0003] The performance of lithium-ion batteries depends on the electrodes, electrolyte and battery materials contained therein, while the characteristics of the electrodes depend on the active materials, current collectors and binders contained in the electrodes. Among them, the role of the binder is to provide active The cohesive force between the materials and between the active material and the current collec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04
CPCY02E60/10
Inventor 邓耀明余红明孙峰陈杰吴凯
Owner DONGGUAN AMPEREX TECH
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