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Use of n-ethyl pyrrolidone in the production of electrodes for double-layer capacitors

An electric double layer capacitor, ethyl pyrrolidone technology, applied in the field of coating aluminum-containing carriers, can solve problems such as teratogenicity

Inactive Publication Date: 2012-10-24
EVONIK LITARION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another problem with NMP is that it is classified as toxic (teratogenic)

Method used

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  • Use of n-ethyl pyrrolidone in the production of electrodes for double-layer capacitors
  • Use of n-ethyl pyrrolidone in the production of electrodes for double-layer capacitors
  • Use of n-ethyl pyrrolidone in the production of electrodes for double-layer capacitors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0038] Initially, put NMP or NEP in a 150ml beaker, then add PVDF in batches within 15min while stirring using a serrated disc (R1303 dissolving stirrer from IKA), diameter 42mm, speed 750rpm. At a PVDF content of 9.1% by weight (12.5 grams in 125 grams of solvent), the addition was stopped and stirring was continued for 1.5 hours (750 rpm). Subsequently, the viscosity was determined as a function of time.

[0039] Table: Comparison of the dissolution of PVDF in NEP and NMP

[0040]

[0041] Compared to the case of the NEP solution, it was found that in the case of the solution containing NMP, the viscosity increased to a much greater extent within a certain period of time. It was also found that after about 16 hours the NEP solution even had a constant viscosity, whereas in the case of the NMP solution the viscosity continued to increase after 5 days.

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PUM

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Abstract

The invention relates to the use of N-ethyl pyrrolidone in the production of electrodes for double-layer capacitors.

Description

technical field [0001] The invention relates to a method for coating an aluminum-containing support in the preparation of electrodes of an electric double layer capacitor, comprising the steps of: providing a substrate containing at least one solvent and / or dispersion medium and at least one polymer binder composition, and use the composition to coat the carrier. Background technique [0002] Electric double layer capacitors (or electrochemical double layer capacitors - EDLCs, ultracapacitors or ultracapacitors) are electrochemical energy storage. They consist of two identical electrodes, both wetted by electrolyte. When a voltage is applied across the electrodes, charged particles of corresponding polarity, such as electrons or ions, gather at the electrodes. To save space by placing the electrodes close to each other, ionically conductive separators can be used to separate the electrodes from each other to avoid short circuits. [0003] Electric double-layer capacitors ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/155H01G9/058H01G11/38
CPCH01G9/04Y02E60/13H01G11/38H01G9/155H01G9/058H01G11/24H01G11/28H01G11/70Y10T428/3154
Inventor P·皮尔格拉姆A·莫德林格
Owner EVONIK LITARION
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