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Cathode for lithium-containing batteries and solvent-free method for the production thereof

A lithium battery and process technology, applied in battery electrodes, lithium batteries, electrode extrusion, etc., can solve problems such as toxicity, complicated dispersion steps, and complicated drying processes

Inactive Publication Date: 2014-11-26
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of these processes are the use of toxic, expensive and high-boiling organic solvents, complicated dispersion steps and complicated drying processes

Method used

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  • Cathode for lithium-containing batteries and solvent-free method for the production thereof
  • Cathode for lithium-containing batteries and solvent-free method for the production thereof
  • Cathode for lithium-containing batteries and solvent-free method for the production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The following dry, solvent-free starting components are provided:

[0082] 0.450g of activated carbon (YP50F, Kuraray Chemical Co., Ltd.) as porous, conductive carbon material,

[0083] 0.450 g of sulfur as electrochemically active cathode material,

[0084] 0.050g of conductive carbon black (Super C65, Te Mi Gao Co., Ltd.) as conductive carbon material,

[0085] 0.050 g polytetrafluoroethylene.

[0086] The above materials were added to the steel mortar mixer (ie to provide a dry, solvent-free composition). The fiberization of the above-mentioned polytetrafluoroethylene was obtained by grinding for 2 minutes under the condition of both the horizontal pressure and the vertical pressure of 20 kg. A fibrous composition is obtained. The composition was calendered in a calender at 155° C. to a thickness of 150 μm. A self-supporting or independent cathode foil is obtained.

[0087] The self-supporting foil has good mechanical properties and, moreover, it can actually b...

Embodiment 2

[0089] The following dry, solvent-free starting components are provided:

[0090] 0.300g spherical carbon (TV 505, Blücher Adsor-Tech Co., Ltd.) as porous, conductive carbon material,

[0091] 0.600 g of sulfur as electrochemically active cathode material,

[0092] 0.050g of conductive carbon black (Super C65, Te Mi Gao Co., Ltd.) as conductive carbon material,

[0093] 0.050 g polytetrafluoroethylene.

[0094] The aforementioned self-supporting cathode foil with a thickness of 150 μm was produced using a similar process step as in Example 1.

Embodiment 3

[0096] The following dry, solvent-free starting components are provided:

[0097] 0.250 g spherical carbon (TV 505, Blücher Adsor-Tech AG) as porous, conductive carbon material,

[0098] 0.500 g of sulfur as electrochemically active cathode material,

[0099] 0.200g of carbon nanotubes (NC7000, Nanocyl) as conductive carbon material,

[0100] 0.050 g polytetrafluoroethylene.

[0101] The aforementioned self-supporting cathode foil with a thickness of 150 μm was produced using a similar process step as in Example 1.

[0102] Using the self-supporting cathode foil produced in Example 3, the discharge curve of the first cycle of the lithium-sulfur battery was determined. This shows up in image 3middle. The discharge capacity of sulfur can be determined as high as 1150 mAh / g. This is almost comparable to the value of the lithium-sulfur battery in the prior art eg US 6,569,573.

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Abstract

The present invention relates to a method for producing a cathode film for a lithium-containing battery, comprising the following steps: (i) providing a dry, solvent-free composition comprising polytetrafluoroethylene, an electrically conductive, electrochemically inactive carbon material and an electrochemically active cathode material; (ii) forming at least partially fibrillated polytetrafluoroethylene by the acting of shearing forces on the dry, solvent-free composition and obtaining a fibrillated composition; (iii) shaping the fibrillated composition into a cathode film.

Description

Background technique [0001] The electrodes (anode and cathode) for lithium-ion batteries are mainly produced by a slurry or slip coating process. The active material in powder form is converted into a pole piece by adding a solvent (typically N-methylpyrrolidone), binder and other additives. This can be applied to the metal foil by various methods such as doctor blade coating or by means of nozzles. [0002] This established process is also commonly used for new battery technologies such as lithium-sulfur systems. The treatment of initial components by means of slurries and pole pieces, based on aqueous or organic solvents, is known in the art. Accordingly, these slurries or slurries are applied to the current collectors by doctor blade or spraying processes. The disadvantages of these processes are the use of toxic, expensive and high-boiling organic solvents, complicated dispersion steps and complicated drying processes. The drying step is particularly important when aqu...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/139H01M4/62
CPCH01M4/0402H01M4/0411H01M4/043H01M10/052H01M4/139H01M4/623Y02E60/122Y02E60/10Y02P70/50H01M4/131H01M4/133H01M10/0525
Inventor J·布鲁克纳S·彻克H·阿尔特斯S·卡斯克尔S·蒂姆
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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