Electric double layer capacitor

一种双电层电容器、电容的技术，应用在电解电容器、电容器、混合电容器电极等方向，能够解决没有提到电解质等问题，达到优异高电流充/放电特征、优异耐久性、低内阻增加度的效果

Inactive Publication Date: 2007-04-04
TOC CAPACITA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, the publication does not mention anything related to the electrolyte used, nor does it give any hint or hint about the combination of both positive and negative pore size distributions and capacitor performance

Method used

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  • Electric double layer capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] (1) Preparation of positive electrode assembly

[0101] Prepare the coating slurry of positive pole polarizable electrode as follows: use N-methylpyrrolidone (NMP) as coating solvent, according to the weight ratio of 85:8:7, mix activated carbon Maxsorb MSP20 (Kansai Coke and Chemical Co., Ltd. production; BET specific surface area is 2300m 2 / g; pore volume 1.07mL / g; 50% particle size 9.5μm), conductive material (HS-100; DenkiKagaku Kogyo KK) and binder polyvinylidene fluoride (Sigma-Aldrich Japan KK; weight average molecular weight 534000 ).

[0102] The slurry is coated on both sides of an etched aluminum foil (30CB; Nippon Capacitor Industry Co., Ltd.) as a positive electrode current collector 111, and then the aluminum foil is wound with a roll press, and dried to remove NMP to form a positive polarizable electrode 112, thereby forming a positive polarizable electrode. Polarized electrode assembly 11A. In this electrode assembly 11A, the apparent surface area of...

Embodiment 2

[0112] An electric double layer capacitor was prepared in the same manner as in Example 1, except that the thickness of the negative polarizable electrode formed on the collector side was set to 85 μm, and the amount of the organic electrolyte added was changed to 39 mL.

Embodiment 3

[0114] An electric double layer capacitor was prepared in the same manner as in Example 1, except that the thickness of the negative polarizable electrode formed on each side of the current collector was set to 90 μm, and the amount of the organic electrolyte added was changed to 41 mL.

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PUM

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Abstract

An electric double layer capacitor has a pair of current collectors, a positive polarizable electrode which is provided on one of the pair of current collectors, includes activated carbon of a weight W + and has a capacitance C + , a negative polarizable electrode which is provided on the other of the pair of current collectors, includes activated carbon of a weight W - and has a capacitance C_, a separator interposed between the positive and negative polarizable electrodes, and an organic electrolytic solution which impregnates at least the positive and negative polarizable electrodes and the separator, wherein C - / C + = 0.6 to 1.0 and W - / W + = 1.1 to 2.0. Even when continuously charged at a high applied voltage, the electric double layer capacitor has a high retention of capacitance and a low rise in internal resistance, and thus has an excellent durability.

Description

technical field [0001] The present invention relates to electric double layer capacitors. Background technique [0002] The energy storage of an electric double layer capacitor is proportional to the square of the applied voltage to the capacitor. Theoretically, by increasing the applied voltage on the capacitor, it should be possible to increase the energy storage of the capacitor. [0003] However, in a conventional electric double layer capacitor using an organic electrolytic solution, when a relatively high voltage of about 2.5 V or higher is applied, both the positive and negative electrodes reach their reaction potentials, causing the electrolytic solution to decompose, thereby causing many problems , such as capacitor durability and cycle performance degradation. [0004] In view of this, a lot of efforts have been made to find a way to increase the rated voltage of the capacitor (voltage rating) to a certain extent, by controlling the capacitance ratio of the posit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/155H01G9/038H01G9/058H01G9/00H01G11/32
CPCY02E60/13H01G11/32
Inventor 吉田浩中田英宪
Owner TOC CAPACITA
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