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Electrode composition, electrode, and battery

A technology of electrode composition and iron compound, which is applied in non-aqueous electrolyte batteries, electrode manufacturing, secondary batteries, etc., can solve the problems of battery performance degradation, insufficient conductivity, safety problems, etc., and achieve good adhesion , good softness, good safety effect

Active Publication Date: 2007-11-14
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when these binders are used, the conductivity is not sufficient
In addition, since these binders decompose at a voltage exceeding 4.0V, in the case of overcharging, the performance of the battery is reduced, and there is also a problem with safety.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098]Under nitrogen ambient atmosphere, 674.9 parts of deionized water, 7.1 parts of 28% sodium lauryl sulfate aqueous solution, and 0.8 parts of sodium tripolyphosphate were supplied to the reactor equipped with a stirrer and a condenser. The contents of the reactor were then heated to 75°C while stirring. Then, 82 parts of 2.44% ammonium persulfate aqueous solution was added to the reactor as an aqueous initiator solution, and then 400 parts of monomer compositions having the composition shown in Table 1 were added to the reactor at a constant rate over 2 hours. After the addition, the reaction temperature was kept at 80°C and the reaction was continued for 3 hours to obtain a copolymer latex. The polymerization conversion rate was 99%, and the composition ratio of the polymer coincided with that of the monomer composition. Ammonia water was added to this latex to adjust the pH to 7, and then concentrated under reduced pressure to remove residual monomers, and the solid co...

Embodiment 2

[0107] Example 2 2EHA(64) / BA(20) / AN(15) / EDMA(1)

Embodiment 3

[0124] Except using a monomer combination comprising 296 parts of 2-ethylhexyl acrylate (2EHA), 80 parts of butyl acrylate (BA), 20 parts of acrylonitrile (AN) and 4 parts of ethylene glycol dimethacrylate (EDMA) A copolymer latex having a solid content concentration of 40% was obtained in the same manner as in Example 1 except that the monomer composition was used as the monomer composition. Further, a carbon containing 1.6% was produced in the same manner as in Example 1 from this copolymer latex. LiFePO with an olivine structure with a 50% volume cumulative diameter of 2.9 μm 4 as a positive electrode active material.

[0125] Using the obtained positive electrode active material, an electrode having an active material layer thickness of 120 μm was produced in the same manner as in Example 1. Table 2 shows the results of measuring the surface roughness (Ra) of the prepared electrodes.

[0126] In addition, this electrode was compressed and dried under reduced pressure in...

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PUM

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Abstract

Disclosed is an electrode composition containing a positive electrode active material including an iron compound and carbon, and a copolymer (P) of an acrylate and / or methacrylate and an a,ss-unsaturated nitrile compound. Also disclosed is an electrode which is composed of an active material layer made of such an electrode composition and a collector. This electrode can be produced by mixing the positive electrode active material, the copolymer (P), a solvent, and if necessary, a thickener using a mixer, thereby forming a slurry electrode composition having a solid content concentration of 40-90% by weight, and then coating the thus-obtained electrode composition over the collector and removing the solvent from the coating. Further disclosed is a battery comprising such an electrode.

Description

technical field [0001] The present invention relates to electrode compositions, electrodes and batteries. More specifically, it relates to an electrode composition containing a positive electrode active material containing an iron-containing compound and carbon, capable of obtaining a battery having a high capacity, a small internal resistance, and a small decrease in capacity due to repeated charging and discharging, and an electrode obtained by using the electrode composition and battery. Background technique [0002] Non-aqueous electrolyte secondary batteries such as lithium-ion secondary batteries are often used as power sources for portable terminals such as notebook computers, mobile phones, and PDAs that have spread rapidly in recent years. In addition, in recent years, non-aqueous electrolyte secondary batteries have attracted attention even as large-scale power sources for electric vehicles due to environmental problems or resource problems. The positive pole of ...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/04H01M4/58H01M4/62H01M10/40H01M4/136H01M4/1395H01M10/05
CPCY02E60/122Y02T10/7011Y02E60/10
Inventor 福峰真弓森满博山川雅裕森英和
Owner ZEON CORP
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