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Separator with improved ease of handling

A separator and base material technology, which is applied in the field of electrochemical batteries, can solve problems such as damage to ceramic separators and short circuits of battery packs, and achieve the effects of good lamination, good bendability, and high bending resistance

Active Publication Date: 2007-03-14
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to carelessness or due to the manufacturing process, the ceramic separator can easily be damaged, which can also subsequently lead to short circuits in the battery pack, for example due to kinks in the separator and / or cavities in the folded edges

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0061] The method for the preparation of a separator according to the invention is characterized in that a ceramic coating is provided on a substrate containing fiber-to-fiber cavities made of non-conductive material, for which purpose a coating is applied on and in the substrate Suspension comprising a sol and at least two particle components suspended in the sol, wherein the first component comprises The oxide particles are selected from or consist of oxides of the elements Al, Zr and / or Si, while the second component contains or consists of polymer particles.

[0062] Polymer particles which can be used in the process according to the invention are, for example, particles of polymers and copolymers, particularly preferably from PVDF, PP, PE and other polymers which are stable in lithium batteries. Preferably used polymer particles have a melting temperature between 100°C and 250°C. The melting temperature may also be lower than the highest temperature used during the prepa...

Embodiment 1

[0118] First add 5 g of concentrated HNO to 130 g of water and 32 g of ethanol 3 solution, 10 g tetraethoxysilane, 1 g methyltriethoxysilane and 7.5 g Dynasilan GLYMO (Degussa AG). Then, 250 g of aluminum oxide Martoxid MZS-1 (Martinswerke) and 18 g of PVDF copolymer powder (Kynarflex 2801; Arkema GmbH; 140° C. MP) were suspended in this sol which was first stirred for several hours. The slurry is then homogenized with a magnetic stirrer for at least 24 hours, the stirring vessel having to be sealed so that no solvent is lost.

[0119] Then in the continuous calendering method (belt speed about 30m / h, T = 200 ℃) with the above slurry coating 20cm wide and thickness of about 20μm and surface weight of about 10g / m 2 PET non-woven fabric (Freudenberg VliesstoffeKG company). Finally, a separator with an average pore width of 250 nm was obtained.

Embodiment 2

[0121] First add 5 g of concentrated HNO to 130 g of water and 32 g of ethanol 3 solution, 10 g tetraethoxysilane, 1 g methyltriethoxysilane and 7.5 g Dynasilan GLYMO (Degussa AG). Then, in this sol which was first stirred for several hours, 230 g of Alcoa's alumina ct 3000 SG and 18 g of polyolefin copolymer powder (Vestowax A616; Degussa AG; 120°C MP; d50 = 5-6 μm) were suspended respectively . The slurry is then homogenized with a magnetic stirrer for at least 24 hours, the stirring vessel having to be sealed so that no solvent is lost.

[0122] Then with the continuous rolling method (belt speed about 30m / h, T = 200 ℃) with the above slurry material coating 20cm wide and thickness of about 20μm and surface weight of about 10g / m 2 PET non-woven fabric (Freudenberg VliesstoffeKG company) and it was cured at this temperature. Finally, a separator with an average pore width of 100 nm was obtained.

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Abstract

Robust separator which has, on a substrate and in the voids of the substrate, which comprises fibers of an electrically nonconductive material, an electrically nonconductive coating comprising oxide particles which are adhesively bonded to one another and to the substrate by an inorganic adhesive and comprise at least one oxide selected from Al2O3, ZrO2 and SiO2, polymer particles also being present in the ceramic coating in addition to the oxide particles of Al2O3, ZrO2 and / or SiO2. These separators have particularly good handling properties since they are mechanically very stable.

Description

technical field [0001] The present invention relates to a separator for an electrochemical cell, a method for preparing such a separator and an electrochemical cell containing such a separator. Background technique [0002] Electrochemical cells or batteries are understood in this description to mean batteries and accumulators (secondary batteries) of all kinds, in particular alkali metal-, such as lithium-, lithium-ion-, lithium-polymer- and alkaline-earth metal - Batteries and accumulators, more precisely also batteries and accumulators in the form of high-energy systems or high-efficiency systems. [0003] Electrochemical cells include those in which opposite electrodes are separated from each other by a separator while maintaining ionic conductivity. [0004] Traditionally, a separator is a thin, porous, electrically insulating substance with high ion permeability, good mechanical strength and Chemical reagents and solvents have long-term stability. In an electrochemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/426H01M50/434H01M50/454H01M50/489
CPCH01M2/1666H01M2/162H01M2/1646H01M10/052Y10T29/4911Y02E60/10H01M50/44H01M50/403H01M50/454H01M50/434H01M50/489H01M50/426H01M50/411H01M50/431H01M50/449
Inventor C·许英V·亨尼格G·赫尔佩尔
Owner EVONIK DEGUSSA GMBH
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