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Positive electrode for secondary batteries, and secondary battery

A secondary battery and positive electrode technology, applied in the direction of secondary batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of battery capacity degradation, battery safety reduction, etc.

Active Publication Date: 2012-05-23
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of using a manganese-based active material as the positive electrode active material, there is a problem of deterioration in battery capacity as described above.
In addition, since the eluted manganese ions are precipitated in the form of trees on the surface of the negative electrode, there is a problem that the safety of the battery is reduced.

Method used

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  • Positive electrode for secondary batteries, and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0149] (A) Manufacture of adhesive

[0150] 10.75 parts of 2-ethylhexyl acrylate, 1.25 parts of acrylonitrile, 0.12 parts of sodium lauryl sulfate, and 79 parts of ion-exchanged water were added to polymerization tank A, and then 0.2 parts of ammonium persulfate and ion-exchanged water were added as polymerization initiators. 10 parts, heated to 60°C and stirred for 90 minutes, then, 67 parts of 2-ethylhexyl acrylate, 19 parts of acrylonitrile, 2.0 parts of methacrylic acid, and allyl methacrylate were added to another polymerization tank B 0.2 part, 0.7 part of sodium lauryl sulfate, and 46 parts of ion-exchanged water were stirred to produce a latex, and the produced latex was gradually added from the polymerization tank B to the polymerization tank A over about 180 minutes, and then stirred for about 120 minutes, When the monomer consumption reached 95%, the reaction was terminated by cooling, and then the pH was adjusted with a 4% NaOH aqueous solution to obtain an aqueous...

Embodiment 2

[0159] (A) Manufacture of adhesive

[0160] 10.75 parts of 2-ethylhexyl acrylate, 1.25 parts of acrylonitrile, 0.12 parts of sodium lauryl sulfate, and 79 parts of ion-exchanged water were added to polymerization tank A, and then 0.2 parts of ammonium persulfate and ion-exchanged water were added as polymerization initiators. 10 parts, heated to 60°C and stirred for 90 minutes, then, 67 parts of 2-ethylhexyl acrylate, 19 parts of acrylonitrile, 2.0 parts of itaconic acid, and allyl methacrylate were added to another polymerization tank B 0.2 part, 0.7 part of sodium lauryl sulfate, and 46 parts of ion-exchanged water were stirred to produce a latex, and the produced latex was gradually added from the polymerization tank B to the polymerization tank A over about 180 minutes, and then stirred for about 120 minutes, When the monomer consumption reached 95%, cooling was performed to terminate the reaction, and then the pH was adjusted with a 4% aqueous NaOH solution to obtain an a...

Embodiment 3

[0164] (A) Manufacture of adhesive

[0165] 10.75 parts of 2-ethylhexyl acrylate, 1.25 parts of acrylonitrile, 0.12 parts of sodium lauryl sulfate, and 79 parts of ion-exchanged water were added to polymerization tank A, and then 0.2 parts of ammonium persulfate and ion-exchanged water were added as polymerization initiators. 10 parts, heated to 60° C. and stirred for 90 minutes, then, 67 parts of 2-ethylhexyl acrylate, 19 parts of acrylonitrile, 1.0 part of methacrylic acid, and allyl methacrylate were added to another polymerization tank B 0.2 part, 0.7 part of sodium lauryl sulfate, and 46 parts of ion-exchanged water were stirred to produce a latex, and the produced latex was gradually added from the polymerization tank B to the polymerization tank A over about 180 minutes, and then stirred for about 120 minutes, When the monomer consumption reached 95%, the reaction was terminated by cooling, and then the pH was adjusted with a 4% NaOH aqueous solution to obtain an aqueou...

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Abstract

Disclosed is a positive electrode for secondary batteries, which can achieve high output properties, cycle properties and safety performance. The positive electrode for secondary batteries is characterized by comprising a current collector and an electrode active material layer which is laminated on the current collector and comprises a positive electrode active material comprising manganese and a binder, wherein the binder comprises a constituent unit derived from a (meth) acrylic acid ester monomer, a constituent unit derived from an vinyl monomer having an acid component, a constituent unit derived from an a,ss-unsaturated nitrile monomer, and a constituent unit derived from a monomer having a crosslinkable group, the content of the constituent unit derived from a vinyl monomer having an acid component in the binder is 1.0 to 3.0 mass%, and a constituent unit derived from allyl acrylate or a constituent unit derived from allyl methacrylate is contained as the constituent unit derived from a monomer having a crosslinkable group.

Description

technical field [0001] The present invention relates to a positive electrode for secondary batteries, and more particularly, to a positive electrode for secondary batteries that is used in lithium ion secondary batteries and the like and has high rate characteristics and high cycle characteristics. In addition, the present invention relates to a secondary battery having the above-described electrode. Background technique [0002] Among the batteries that have been put into practical use, lithium ion secondary batteries show the highest energy density, and are widely used especially for small electronic applications. In addition to small applications, it is also expected to expand in automotive applications. Among them, it is desired to further improve the reliability of lithium ion secondary batteries such as higher output power and cycle characteristics. [0003] As the positive electrode active material constituting the lithium ion secondary battery, the price of the cob...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/131H01M10/0566
CPCH01M4/621Y02E60/122H01M4/622H01M4/505H01M4/131Y02E60/10H01M4/50H01M4/62H01M10/05
Inventor 胁坂康寻薮内庸介
Owner ZEON CORP
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