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Highly electron conductive polymer and electrochemical energy storage device with high capacity and high power using the same

A conductive polymer, polymer technology, applied in the direction of battery electrodes, non-aqueous electrolyte batteries, conductors, etc., can solve the problem of not being able to increase the capacity of energy storage devices

Active Publication Date: 2009-05-27
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of such polymer binders and conductive agents does not increase the capacity of the energy storage device

Method used

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  • Highly electron conductive polymer and electrochemical energy storage device with high capacity and high power using the same
  • Highly electron conductive polymer and electrochemical energy storage device with high capacity and high power using the same
  • Highly electron conductive polymer and electrochemical energy storage device with high capacity and high power using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 1-1. Preparation of conductive polymer with enhanced electrical conductivity by introducing salt / applying voltage

[0063] Will be made of PEDOT (polyethylenedioxythiophene) (molecular weight 30,000; adhesion: 10g / cm or greater; conductivity: ~ 1 × 10 -5S / cm) The conductive polymer film that forms is coated on the platinum plate, and it is applied the voltage of 1V (relative to Ag / AgCl) 1 hour, at the same time, described conductive polymer film is immersed in the HCl solution of 2% by weight to The doped polymer PEDOT is provided. Platinum was used as a counter electrode.

[0064] 1-2. Manufacturing electrodes

[0065] Add 90% by weight of activated carbon (MSP20, Kansai Coke and Chemicals Co., Ltd.) and 10% by weight of the modified conductive polymer PEDOT prepared in Example 1-1 as an electrode active material to distilled water as a solvent, to provide a binary mixture as an electrode paste. The electrode slurry was applied onto an aluminum (Al) foil having...

experiment Embodiment 1

[0075] Experimental Example 1. Comparison and Evaluation of Electronic Conductivity

[0076] The modified high electronic conductivity polymer (PEDOT) of Example 1 is used as a sample, and the polymer (PEDOT) currently used as a conductive agent in lithium secondary batteries and electric double layer capacitors and carbon nanotubes (CNT) is generally used as a high Super-P, which is an electronic conductivity material, was used as a control. The above materials were pelletized separately, and the electronic conductivity of each material was measured using a four-probe method.

[0077] After this test, it can be seen that the high electronic conductivity polymer (PEDOT) of the present invention has an excellent electrical conductivity compared with the conventional conductive agent Super-P, and exhibits an electronic conductivity comparable to that of carbon nanotubes (see Table 1 below). This demonstrates that the conductive polymer is sufficient as a conductive agent in ba...

experiment Embodiment 2

[0080] Experimental Example 2. Adhesion test

[0081] The following tests were conducted to evaluate the electrode adhesion of Example 1 and Comparative Examples 1-3.

[0082] The adhesion test was conducted by attaching a tape to the surface of the electrode active material layer of each electrode and peeling off the tape. The amount of each electrode active material layer remaining on the tape after the tape was removed is shown in Table 2 below.

[0083] After this test, it can be seen that the electrode of Comparative Example 1 using a binder (PTFE) was slightly contaminated with the electrode active material. In contrast, each of the electrodes using the conductive polymer of Example 1 and Comparative Examples 2 and 3 was not contaminated with the electrode active material (see Table 2 below). This demonstrates that the conductive polymer can be used as a high-quality adhesive.

[0084] [Table 2]

[0085] condition

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Abstract

Disclosed is a method for preparing a highly electron conductive polymer, the method comprising a step of doping a conductive polymer with a dopant capable of introducing movable charge carriers into the repeating units of the polymer, wherein a voltage higher than a conduction band of the polymer is applied to the polymer while the polymer is doped with the dopant, so as to modify electron conductivity of the conductive polymer. A highly electron conductive polymer obtained by the method, an electrode comprising the highly electron conductive polymer, and an electrochemical device including the electrode are also disclosed. The novel doping method for improving the electron conductivity of a conductive polymer can provide a conductive polymer with a conductivity comparable to the conductivity of a conventional conductive agent.

Description

technical field [0001] The present invention relates to a method for modifying conductive polymers to obtain high electronic conductivity comparable to conventional conductive agents. The present invention also relates to conductive polymers having electronic conductivity improved by this method, and electrochemical energy storage devices using said conductive polymer binders. Background technique [0002] In general, a secondary electrical energy storage device is a system for storing and accumulating electrical power to deliver it to an external circuit. Specific examples of such electric energy storage devices include general batteries, capacitors, electrochemical capacitors (ultracapacitors, ultracapacitors, and electric double layer capacitors), and the like. A typical example of such a battery—a lithium secondary battery completes charging / discharging through the intercalation / deintercalation mechanism of lithium ions, while an electrochemical capacitor completes char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/12
CPCC08G61/10C08G2261/3221H01B1/127H01M10/052C08G2261/312H01B1/122H01M4/137H01M4/602Y02E60/122C08G61/08C08G61/124H01M4/60C08G2261/3223C08G61/126C08G2261/79C08G2261/792C08G2261/51Y02E60/10C08K3/24C08J3/28
Inventor 朴宗爀李相英李玉珠
Owner LG ENERGY SOLUTION LTD
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