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Binder for electrode, composition for electrode, and electrode sheet

A binder and electrode technology, used in battery electrodes, non-aqueous electrolyte storage batteries, circuits, etc., can solve the problems of inability to obtain stable electrochemical devices, reduced operability in the calendering process, peeling of electrode mixture layers, etc., and achieve excellent coating. Excellent performance and reliability

Active Publication Date: 2016-03-09
NIPPON A & L INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for these methods, there are problems that the electrode mixture layer obtained by coating and drying the electrode composition on the collector is easy to peel off from the collector, and the calendering process is damaged due to contamination of the calender roll and the like. workability decreased significantly
In addition, there is a problem that the electrode mixture layer becomes an electrode with a non-uniform structure, so that a stable electrochemical device cannot be obtained.

Method used

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  • Binder for electrode, composition for electrode, and electrode sheet
  • Binder for electrode, composition for electrode, and electrode sheet
  • Binder for electrode, composition for electrode, and electrode sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] In a pressure-resistant polymerization reactor, 10 parts by mass of cyclohexene, and the mixing amounts (parts by mass) of each monomer component and other compounds shown in the first stage in Table 1 were added and stirred, thereby Obtain the reaction solution.

[0126] Next, the temperature in the polymerization reactor (polymerization tank) was raised, and the time point at which the polymer conversion rate of the reaction system became 1.0% was set as the arrival time, and the arrival time was set as a reference (0 minute), from Start after 80 minutes, each monomer component shown in the second stage of Table 1 and other compounds are in the time period of continuous addition shown in Table 1 (based on the time of arrival, from 80 minutes to 340 minutes after starting) ) into the reaction solution. In addition, the reaction temperature of the reaction system was set to 62°C.

[0127] Then, each monomer component and other compounds of the mixing amount (mass part...

Embodiment 2、6

[0133] Copolymer latexes B and F were obtained in the same manner as in Example 1, except that the mixing amount of each monomer component and other compounds, the continuous addition time period, and the reaction temperature were changed to the conditions shown in Table 1.

Embodiment 3－5

[0135] Change the mixing amount of each monomer component and other compounds, the continuous addition time period, and the reaction temperature to the conditions shown in Table 1, and change the amount of cyclohexene to 4 parts by weight, except that it is the same as in Example 1 To operate, so as to obtain the copolymer latex C-E.

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Abstract

A binder for an electrode according to the present invention contains a copolymer latex obtained by emulsion polymerization, the binder for an electrode being characterized in that: the copolymer is formed of monomer components comprising 15-60 mass% of an aliphatic conjugated diene monomer, 5-35 mass% of an ethylenically unsaturated carboxylic acid monomer, 0 mass% to less than 5 mass% of a vinyl cyanide monomer, and 5-80 mass% of a monomer that is copolymerizable with the above monomers; and when dynamic viscoelasticity measurement is performed on the film obtained by drying the copolymer latex, where Tp (DEG C) represents the peak top temperature for the largest peak of tan[delta], the ratio (E1' / E2') between the average value E1' of the storage elastic modulus in the range (Tp - 60) DEG C to (Tp - 70)DEG C and the average value E2' of the storage elastic modulus in the range (Tp + 60)DEG C to (Tp + 70)DEG C is equal to or smaller than 1000.

Description

technical field [0001] The present invention relates to a binder for electrodes, a composition for electrodes containing the binder, and an electrode sheet. Background technique [0002] In recent years, the popularity of reusable secondary batteries and capacitors has been astonishing, and performances such as higher capacity and longer cycle life have been demanded. [0003] As a method of manufacturing electrodes used in electrochemical devices such as lithium-ion secondary batteries and lithium-ion capacitors, for example, it is well known to prepare active materials that can absorb or absorb, desorb or release ions, and to use binders for electrodes. A method in which an electrode composition of a polymer binder of an agent is coated on a metal material (hereinafter referred to as a "collector") and dried. Polymer binders contribute significantly to the adhesion between active materials, or between active materials and current collectors. In addition, they are also sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62C08F2/00C08F236/04
CPCC08F236/06C08F236/10H01M4/622H01M10/052Y02E60/10C08F212/08C08F220/14C08F220/06C08F220/44C08F222/02
Inventor 肥田和男高森美和松山贵志
Owner NIPPON A & L INC