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Anode or cathode pole piece of lithium ion battery and coating method thereof

A lithium-ion battery and negative pole piece technology, which is applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrode manufacturing, etc., can solve problems such as easy powder drop of battery electrode pole pieces, high production raw material costs, and increased battery internal resistance , to achieve the effect of reducing powder shedding, improving market competitiveness and reducing surface energy

Inactive Publication Date: 2008-05-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the performance of lithium-ion batteries is relatively superior, there are still some problems in the production process, which have some adverse effects on the production and performance of the battery. Large resistance, high cost of raw materials for production, etc.
The most commonly used method to solve such problems is to increase or improve the amount of binder and conductive agent, but the increase in the amount of binder will greatly increase the internal resistance of the battery, reduce the specific capacity, poor cycle life, and reduce the cost of raw materials for production. Higher effects, the amount of conductive agent will have a similar situation

Method used

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  • Anode or cathode pole piece of lithium ion battery and coating method thereof

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Effect test

Embodiment 1

[0031] A kind of preparation of positive pole piece of lithium ion battery:

[0032] (1) Accurately weigh 100 grams of PVDF, 100 grams of conductive carbon black, and 1000 grams of NMP.

[0033] (2) The preparation of conductive adhesive, first, add 1000 grams of NMP into the vacuum mixer, then slowly add 100 grams of PVDF, stir, make PVDF dissolve completely, after mixing evenly, then add 100 grams of conductive carbon black, stir and mix evenly Make positive electrode conductive adhesive emulsion.

[0034] (3) Preparation of positive electrode material slurry: 94.5 grams of lithium cobaltate, 3.0 grams of conductive carbon black, 2.5 grams of PVDF and 50 grams of NMP were mixed evenly to prepare a positive electrode material slurry.

[0035] (4) Put the prepared conductive adhesive emulsion into the conductive adhesive tank 2 in Figure 1, install aluminum foil (thickness 0.018mm±0.002mm×width 260mm±1.0mm) on the unwinding device 1, and put the positive electrode material sl...

Embodiment 2

[0037] A kind of preparation of negative pole piece of lithium ion battery:

[0038] (1) Accurately weigh 50 grams of CMC, 100 grams of SBR emulsion, 100 grams of conductive carbon black, and 1000 grams of pure water.

[0039] (2) The preparation of conductive glue, at first, add 1000 grams of pure water in the vacuum mixer, then slowly add 50 grams of CMC, after stirring evenly, add 100 grams of SBR emulsion, after mixing evenly, then add 100 grams of conductive carbon black, Stir and mix evenly to make negative electrode conductive adhesive emulsion.

[0040] (3) Negative electrode material slurry preparation: 95.4 grams of artificial graphite, 1 gram of conductive carbon black, 1.6 grams of CMC, 2 grams of SBR and 100 grams of pure water were mixed evenly to prepare negative electrode material slurry.

[0041] (4) Put the prepared conductive adhesive emulsion into the conductive adhesive tank 2 in Figure 1, install copper foil (thickness 0.012mm ± 0.002mm × width 240mm ± 1...

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Abstract

The present invention relates to a lithium-ion battery anode or cathode pole piece and a spreading method of the anode pole piece or the cathode pole piece, wherein, the anode pole piece and the cathode pole piece consists of a foil, a conducting adhesive thin layer and an electrode active material layer in turn; the thickness of the conducting adhesive thin layer is five to ten microns. The electrode pole piece is made in the procedures that a layer of conducting adhesive thin layer in the thickness of five to ten microns are pre-coated on the surface of the foil before the sizing agent is spread, so that a conducting adhesive thin layer having good adhesive force, good conductivity and compact structure is formed on the surface of the foil. Then the electrode active material sizing agent is spread on the conducting adhesive thin layer, and is dried under an appropriate temperature to produce a required pole piece. The present invention can reduce the surface of the foil, and can improve the wetting quality of the sizing agent, thereby improving the adhesion performance of the anode material and the collecting body (aluminum foil) so as to reduce the powder-dropping of the battery during the cycling process, and to prolong the cycling service life of the battery; moreover, the present invention can reduce the content of the adhesive agent in the sizing agent, and improve the utilization rate of the active substance, and the method of the present invention does not produce negative influence on the performance of the battery.

Description

technical field [0001] The invention relates to a lithium ion battery positive pole or negative pole piece and a coating method thereof. Background technique [0002] Lithium-ion battery is the latest generation of green high-energy rechargeable battery. It was first successfully developed by Japan's SONY company in 1990. With the continuous advancement of science and technology, the energy density and capacity of lithium-ion batteries continue to increase. Lithium-ion batteries are characterized by their superior performance. Gradually replacing nickel-cadmium batteries and nickel-metal hydride batteries, it has become the preferred rechargeable battery for portable electronic devices. It has broad application prospects in video cameras, digital cameras, mobile phones and notebook computers, electric vehicles, space technology, and defense industries. [0003] Although the performance of lithium-ion batteries is relatively superior, there are still some problems in the prod...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/62H01M4/04H01M4/13
CPCY02E60/12Y02E60/10
Inventor 邓凌峰
Owner CENT SOUTH UNIV
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