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Composite carbon electrode for rechargeable lithium-based batteries

An electrode and composite material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low first cycle efficiency electrodes, and achieve the effects of good cycle capacity, high specific capacity, and good rated capacity

Inactive Publication Date: 2003-04-02
KONOKO INK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it is generally believed that the use of high surface area carbon blacks will result in electrodes with low first cycle efficiencies

Method used

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  • Composite carbon electrode for rechargeable lithium-based batteries
  • Composite carbon electrode for rechargeable lithium-based batteries
  • Composite carbon electrode for rechargeable lithium-based batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 47 g of Petoca M5161  Carbon fiber (active material), 0.5 g Cabot carbon black Black Pearls  2000 (conductive additive), 31.25 grams of 15% by weight PVDF / NMP solution and 40 grams of NMP were added to a 250-ml tank equipped with 50 iron balls (φ=1 / 4 inch). The mixture was mixed through paint shaking for 40 minutes.

[0036] The slurry was coated on copper foil (~20 μm thick) using a doctor blade with a 250 μm thick wet coating. The coated electrode was heated at 150°C for 20 minutes. Electrode thickness with copper collectors is typically 100 μm.

[0037] Cut the electrodes into 3.5×4cm 2 of the article. Then at room temperature at 1000kg / cm 2 The apparent pressure of these strips was pressed with a roll press. After pressing, the thickness of the electrode with collector is typically 80 µm. The pressed electrodes were cut into discs with a diameter of approximately 0.75 cm. The weight of the active material in the disc electrode was 15 mg. The electrodes w...

Embodiment 2

[0041] In addition to the conductive additive is a surface area of ​​254m 2 / g and Cabot carbon black Vulcan XC 72R with a particle size of 30nm  In addition, all steps are similar to the above-mentioned embodiment. Comparative example A

Embodiment 3

[0047] 48.45 grams of graphitized carbon fiber (active material) from mesophase pitch (Conoco Inc.) solvate, 0.3 grams of Cabot carbon black Black Pearls  2000 (conductive additive), 8.33 grams of 15wt% PVDF / NMP solution and 50 grams of NMP were added to a 250-ml tank equipped with 50 iron balls (φ=0.64 cm (1 / 4 inch)). The mixture was mixed for 40 minutes using a paint shaker.

[0048] The slurry was coated onto copper foil (~20 μm thick) using a doctor blade with a 250 μm thick wet coating and the coated electrode was heated at 130° C. for 30 minutes. Electrode thickness with copper collectors is typically 100 μm.

[0049] Cut the electrodes into 3.5×4cm 2 of the article. Then at room temperature at 1000kg / cm 2 The apparent pressure of these bars was pressed with a roll press. The thickness of the electrode with the collecting electrode after pressing is generally 80 μm. The pressed electrodes were cut into discs with a diameter of -0.75 cm. The weight of the active m...

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Abstract

The invention discloses a composition suitable for coating collectors in lithium ion batteries, including carbon fibers and electrically conductive particles coating the carbon fibers. The electrically conductive particles have an average particle size less than about 40 nm. Preferably, the average particles size is about 30 nm and has a specific surface area greater than about 1200 square meters per gram. Electrodes manufactured using a composition of the invention exhibit significantly improved electronic conductivity, in-cell capacity and cycling properties, generally thought to be due to enhanced binding properties that give an overall improved electronic conductivity.

Description

Background of the invention [0001] Lithium-based batteries for rechargeable lithium-ion batteries typically include electrodes that may be formed as part of a composite material containing carbon fibers. Typically these carbon fibers are formed from a mesophase pitch and contain graphitized carbon crystallites. Such composites often also include conductive coating additives, such as carbon black, to increase electrical conductivity, thereby improving the performance of the electrodes. [0002] The amount of carbon black in electrode composites for lithium-ion batteries is generally about 5% by weight of the composite. The average particle size of the carbon black used is usually between 50nm and 100nm. The specific surface area of ​​the particles in carbon black is generally about 80 square meters per gram or less. In order to suppress electrolyte decomposition that may occur in batteries, the specific surface area of ​​carbon black is generally limited. [0003] There are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60
CPCY02E60/10
Inventor 施杰C·朗普-翁内吕德P·翁内吕德
Owner KONOKO INK
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