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Lithium-ion secondary battery

A secondary battery and lithium-ion technology, applied in secondary batteries, lithium batteries, battery electrodes, etc., can solve problems such as the performance impact of lithium-ion secondary batteries, and achieve excellent low-temperature characteristics and excellent cycle characteristics.

Inactive Publication Date: 2016-11-23
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrolyte solution sometimes decomposes due to charge and discharge of lithium-ion secondary batteries, which affects the performance of lithium-ion secondary batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0268] (1-1. Manufacturing method of water-soluble polymer)

[0269] Add 32.5 parts of methacrylic acid (ethylenically unsaturated carboxylic acid monomer) and 2,2,2-trifluoroethyl methacrylate (fluorine-containing (meth)acrylate monomer) into a 5MPa pressure vessel with a stirrer. Body) 7.5 parts, ethylene glycol dimethacrylate (crosslinkable monomer) 0.8 parts, butyl acrylate (optional monomer) 58.0 parts, polyoxyalkylene alkenyl ether ammonium sulfate (reactive surface Active agent monomer, manufactured by Kao Corporation, trade name "LATEMUL PD-104") 1.2 parts, t-dodecyl mercaptan 0.6 parts, ion exchange water 150 parts, and potassium persulfate (polymerization initiator) 0.5 parts, sufficient To stir. Then, it was heated to 60°C to initiate polymerization. Cooling was performed when the polymerization conversion rate reached 96%, the reaction was stopped, and a mixture containing a water-soluble polymer was obtained. 10% ammonia water was added to the mixture containing t...

Embodiment 2

[0292] Except that in the above (1-1), the amount of 2,2,2-trifluoroethyl methacrylate was changed to 3 parts, and the amount of butyl acrylate was changed to 62.5 parts, the same as Example 1 A lithium ion secondary battery was manufactured and evaluated.

Embodiment 3

[0294] Except that in the above (1-1), the amount of 2,2,2-trifluoroethyl methacrylate was changed to 18 parts, and the amount of butyl acrylate was changed to 47.5 parts, the same as in Example 1 A lithium ion secondary battery was manufactured and evaluated.

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Abstract

A lithium ion secondary battery which is provided with a positive electrode, a negative electrode, an electrolyte solution, and a separator. The negative electrode is provided with a negative electrode active material layer that is formed of a composition which contains a negative electrode active material, a particulate binder and a water-soluble polymer. The negative electrode active material has a specific surface area of 2-15 m2 / g. The water-soluble polymer is a copolymer that contains an ethylenically unsaturated carboxylic acid monomer unit and a fluorine-containing (meth)acrylic acid ester monomer unit. The solvent of the electrolyte solution contains 50-80% by volume of propylene carbonate and 0.05-1% by volume of vinylene carbonate.

Description

Technical field [0001] The present invention relates to a lithium ion secondary battery. Background technique [0002] Generally, a lithium ion secondary battery includes a positive electrode, a negative electrode, an electrolyte, and a separator. The electrolyte may be decomposed by charging and discharging of the lithium ion secondary battery, which may affect the performance of the lithium ion secondary battery. Therefore, conventionally, studies on electrolyte solutions have been conducted for the purpose of improving various performances of lithium ion secondary batteries (see Patent Documents 1 to 3). [0003] Prior art literature [0004] Patent literature [0005] Patent Document 1: Japanese Patent Application Publication No. 2008-066062 [0006] Patent Document 2: Japanese Patent Application Publication No. 2009-076433 [0007] Patent Document 3: Japanese Patent Application Publication No. 2011-124039 Summary of the invention [0008] The problem to be solved by the invention...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62C08F220/04C08F220/22H01M4/13H01M4/36H01M10/052H01M10/0567H01M10/0569
CPCC08F220/04C08F220/22H01M4/13H01M4/621H01M10/0525H01M10/0569H01M4/36H01M4/62H01M10/052H01M10/0567Y02E60/10H01M4/622H01M2300/0037
Inventor 佐佐木智一
Owner ZEON CORP