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Sintered lithium complex oxide

A composite oxide and sintered body technology, which is applied in the fields of cobalt compounds, manganese compounds, inorganic chemistry, etc., can solve the problems of unrecorded particle or pore forming agent manufacturing methods, etc., and achieve the effect of excellent high-speed discharge characteristics and stable porous structure

Inactive Publication Date: 2011-09-28
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no description of a specific production method using particles for forming pores or a pore forming agent.

Method used

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  • Sintered lithium complex oxide
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0153]

[0154] Japanese synthesis of adding 9.6 g of commercially available polymethyl methacrylate particles (MX-150 manufactured by Soken Chemical Co., Ltd., average particle size: 1.5 μm) to polyvinyl alcohol having a quaternary ammonium salt group on the side chain To 32 g of a 4% by weight aqueous solution of Gohsefimer K-210 manufactured by Chemical Corporation, ultrasonic dispersion treatment was performed for 1 minute, and then 168 g of ion-exchanged water was added, and ultrasonic dispersion treatment was performed again for 1 minute. After diluting the obtained polymer emulsion (slurry A) containing surface-modified resin particles (particle A) with ion-exchanged water according to the aforementioned sample conditions, the zeta potential was measured. As a result, it was confirmed that the zeta potential of the particle A was a positive value ( +25mV).

[0155]

[0156] Prepared by adding 225 g of lithium cobaltate particles (manufactured by Honjo Chemical, HLC-...

Embodiment 2

[0164]

[0165] tert-butyl methacrylate (50 g), ion-exchanged water (250 g), a 4% by weight aqueous solution (25 g) of Gohsefimer K-210 manufactured by Nippon Synthetic Chemicals Co., Ltd., emulgen 1135S manufactured by Kao Corporation as a nonionic surfactant- 70 (0.36 g), as an initiator, V-65 (0.15 g) manufactured by Wako Pure Chemical Industries, Ltd. was mixed with an ultrasonic homogenizer (manufactured by NISSEI Corporation, Ultrasonic Generator; US-300T type, probe diameter: 20 mm, electric Flat: 400 μA) was subjected to dispersion treatment for 5 minutes to emulsify it, and then all was added to a 1 L separable flask, and the temperature was raised to 55° C. while stirring under a nitrogen atmosphere, and stirred for 3 hours. Then, the temperature was raised to 65° C. and aged for 1.25 hours. After aging, cool to room temperature to obtain slurry A. The average particle diameter of the particles A contained in this polymer emulsion was 5.0 μm. In addition, the zet...

Embodiment 3

[0173] Except that the maximum calcining temperature in the calcining step was set to 650°C, operations from the preparation of the slurry to the calcining step were performed in the same manner as in Example 1 above to obtain sintered lithium cobaltate particles.

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Abstract

A sintered lithium complex oxide having excellent high-rate discharge characteristics; a positive electrode composition for batteries, which uses the sintered lithium complex oxide; a positive electrode for batteries; and a lithium ion battery. The sintered lithium complex oxide is obtained by sintering fine particles of lithium complex oxide together, and is characterized in that the peak pore size giving the maximum differential pore volume is 0.80-5.00 [mu]m, that the total pore volume is 0.10-2.00 mL / g, that the average particle size is not less than the above-specified peak pore size but not more than 20 [mu]m, that there is a sub-peak giving a differential pore volume not less than 10% of the maximum differential pore volume on the smaller pore size side with respect to the above-specified peak pore size, that the pore size corresponding to the sub-peak is more than 0.50 [mu]m but not more than 2.00 [mu]m, that the BET specific surface area of the sintered lithium complex oxide is 1.0-10.0 m2 / g, and that the half width of the maximum peak among X-ray diffraction peaks in an X-ray diffraction measurement is 0.12-0.30 deg.

Description

technical field [0001] The present invention relates to a lithium composite oxide sintered body for obtaining a positive electrode active material excellent in battery discharge characteristics, a battery positive electrode composition, a battery positive electrode, and a lithium ion battery using the lithium composite oxide sintered body. Background technique [0002] Nonaqueous electrolyte secondary batteries have characteristics of higher operating voltage and higher energy density than conventional nickel-cadmium secondary batteries, and are widely used as power sources for electronic devices. As the positive electrode active material of the nonaqueous electrolyte secondary battery, a lithium transition metal composite oxide typified by lithium cobaltate, lithium nickelate, lithium manganate, and the like is used. [0003] Among them, lithium manganate has the advantages of being easy to obtain cheaply as a raw material and having a small load on the environment because ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/131
CPCH01M4/1391H01M4/0471Y02E60/122H01M4/02H01M2004/021H01M4/485C01G45/1228C01G51/42C01P2004/61C01P2006/12C01P2006/14C01P2006/16Y02E60/10
Inventor 赤木隆一北山博昭石川善信西村谦一斋藤崇实三浦环宫洼博史
Owner KAO CORP
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