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Electrode mixture, electrode, and lithium secondary battery

An electrode and mixture technology, which is applied to lithium batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of lower yield, falling off, or a part of the electrode mixture layer detaching from the collector and floating.

Inactive Publication Date: 2012-10-31
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When such an electrode mixture is applied to a current collector that is corrosive to strong alkalis, such as aluminum and copper, there is concern that hydrogen gas will be generated at the interface between the current collector and the electrode mixture layer, and thus a part of the electrode mixture layer may be removed from the collector. Falling off of the electrode, or part of the electrode mixture layer detaching from the current collector and floating, etc., reduces the yield of the coating process

Method used

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  • Electrode mixture, electrode, and lithium secondary battery
  • Electrode mixture, electrode, and lithium secondary battery

Examples

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Embodiment

[0125] Next, the present invention will be described in further detail through examples. Various evaluations of the lithium composite metal oxide were performed by the following measurements.

[0126] 1. Powder X-ray Diffraction Determination of Lithium Composite Metal Oxide

[0127] The powder X-ray diffraction measurement of the lithium composite metal oxide was performed using RINT2500TTR model manufactured by Rigaku Corporation. The lithium composite metal oxide is filled in a dedicated holder, and it is irradiated with a CuKα ray source, and measured at a diffraction angle 2θ=10 to 90° to obtain a powder X-ray diffraction pattern.

[0128] 2. Determination of the BET specific surface area of ​​lithium composite metal oxides

[0129] After drying 1 g of the powder of the lithium mixed metal oxide at 150° C. for 15 minutes in a nitrogen atmosphere, the BET specific surface area was measured using Flowsorb II2300 manufactured by Micromeritics in accordance with JIS R1 626 ...

manufacture example 1

[0134] Production example 1 (manufacture of lithium composite metal oxide)

[0135] In a beaker made of polypropylene, 83.88 g of potassium hydroxide was added to 200 ml of distilled water, and dissolved by stirring to prepare an aqueous potassium hydroxide solution (aqueous alkali solution). Weigh 16.75 g of nickel (II) chloride hexahydrate, 14.25 g of manganese (II) chloride tetrahydrate, and 1.491 g of iron (II) chloride tetrahydrate, and add them to 200 ml of distilled water in a glass beaker , dissolved by stirring to obtain a nickel-manganese-iron mixed aqueous solution. A mixed aqueous solution of nickel-manganese-iron was added dropwise thereto while stirring an aqueous potassium hydroxide solution to form a coprecipitate and obtain a coprecipitate slurry. Next, the coprecipitate slurry was filtered, and the obtained solid content was washed with distilled water, dried at 100° C., and coprecipitate P1 was collected.

[0136] Co-precipitate (P 1 ) 3.0 g, 1.634 g of l...

manufacture example 2

[0138] Production example 2 (manufacture of water-based latex)

[0139] 0.7 parts by weight of sodium dodecylbenzenesulfonate, 0.005 parts by weight of ferrous sulfate, and 0.8 parts by weight of sodium bicarbonate were dissolved in 25 parts by weight of water, and the resulting solution was placed in a polymerization tank whose atmosphere was previously replaced with ethylene. Next, 2 parts by weight of vinyl chloride was added to the tank to perform stirring and emulsification, and then the pressure was raised to 4.9 MPa with ethylene gas, and the temperature was raised to 50°C. While maintaining the internal temperature at 50°C, 18 parts by weight of vinyl chloride, 1.5 parts by weight of romanthus aqueous solution, and 8.0 parts by weight of ammonium persulfate aqueous solution were continuously added to the tank to carry out polymerization for 8 hours, and the excess ethylene was discharged until it reached atmospheric pressure to obtain Water-based latex containing ethyl...

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Abstract

Provided is an electrode mixture that contains: a lithium composite metal oxide with a BET specific surface area between 2 and 30 m / g; a water-soluble macromolecule that has an acid functional group; water; and a conductor. Also provided is an electrode manufactured by coating a collector with the provided electrode mixture and drying the coated collector. Further provided is a lithium secondary battery, the positive electrode of which is the provided electrode.

Description

technical field [0001] The invention relates to an electrode mixture, an electrode and a lithium secondary battery. Background technique [0002] Lithium secondary batteries are already in practical use as power sources for mobile phones, notebook computers, and the like, and are also being applied to medium and large-scale applications such as automotive applications and power storage applications. [0003] A lithium secondary battery generally includes a positive electrode containing a positive electrode active material capable of being doped and dedoped with lithium ions, a negative electrode containing a negative electrode active material capable of being doped and dedoped with lithium ions, and an electrolyte. [0004] Electrodes such as positive pole and negative pole are prepared as follows, that is, electrode mixture is obtained by mixing and kneading electrode active materials such as positive electrode active material and negative electrode active material and bind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M2/16H01M4/1391H01M4/505H01M4/525H01M4/62H01M10/052
CPCH01M4/505Y02E60/122H01M4/623H01M4/625H01M4/525H01M4/622H01M4/131H01M2004/021Y02E60/10H01M4/62Y02P70/50
Inventor 影浦淳一
Owner SUMITOMO CHEM CO LTD
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