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Lithium secondary battery anode active matter, production method thereof, and lithium secondary battery

A positive active material, lithium secondary battery technology, applied in the direction of active material electrodes, electrode manufacturing, battery electrodes, etc., can solve problems such as high prices

Inactive Publication Date: 2006-10-18
NIPPON CHECMICAL IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] According to the above-mentioned method, a lithium secondary battery having excellent initial capacity and capacity retention can be provided, but some problems remain in terms of cycle characteristics and decrease in battery capacity at low temperature, etc.
On the other hand, there are problems such as high cost of raw materials such as cobalt raw materials such as cobalt oxide, so people have great hopes for positive electrode active materials for lithium secondary batteries that can achieve excellent battery characteristics using cheap cobalt raw materials

Method used

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  • Lithium secondary battery anode active matter, production method thereof, and lithium secondary battery
  • Lithium secondary battery anode active matter, production method thereof, and lithium secondary battery

Examples

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Effect test

Embodiment

[0066] Hereinafter, the present invention will be described more specifically by citing examples, but the present invention is not limited to the exemplified examples.

[0067] modulation cobalt oxyhydroxide

[0068] Sample 1

[0069] 100 ml of pure water was added to 30 g of commercially available cobalt oxyhydroxide (average particle diameter: 10.5 μm, content of particles of 3 μm or less: 25.1% by volume), and left to stand for 2 hours. Then, the supernatant liquid containing the microparticle component was removed, and the cobalt oxyhydroxide was collected and dried, and this was used as a cobalt oxyhydroxide sample.

[0070] Sample 2

[0071] 100 ml of pure water was added to 30 g of commercially available cobalt oxyhydroxide (average particle size: 14.1 μm, content of particles of 3 μm or less: 21.8% by volume), and left to stand for 2 hours. Then, the supernatant liquid containing the microparticle component was removed, and the cobalt oxyhydroxide was collected and dr...

manufacture example 1

[0075] Lithium carbonate (average particle diameter: 10 μm) was mixed with the cobalt oxyhydroxide sample 1 prepared according to the above scheme so that the atomic ratio of Li / Co was 1.01 to prepare a homogeneous mixture, and the sintered product was sintered at 850° C. for 10 hours. Pulverize and classify to obtain lithium cobalt oxide with an average particle diameter of 12.2 μm.

manufacture example 2

[0077] Lithium cobaltate with an average particle size of 17.7 μm was obtained in the same manner as in Production Example 1 except that sample 2 was used instead of cobalt oxyhydroxide.

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Abstract

The invention relates to a lithium secondary battery cathode active material, a manufacturing method thereof and a lithium secondary battery. Even if an inexpensive cobalt raw material is used for the cathode active material of the lithium secondary battery, the cycle characteristics of the lithium secondary battery can be improved, and the battery capacity at low temperature can be improved. The positive electrode active material of the lithium secondary battery is a mixed powder of the following powders (A) and (B): (A) lithium cobalt oxide particles with an average particle size of 5-30 μm formed by sintering a mixture of cobalt oxyhydroxide and lithium compound Powder; (B) Lithium cobaltate particle powder with an average particle diameter of 0.1-10 μm and an average particle diameter smaller than the average particle diameter of the above-mentioned (A) obtained by sintering a mixture of tricobalt tetroxide and a lithium compound, wherein the above-mentioned (A) The compounding ratio with (B) is (A):(B)=95:5~60:40 by weight ratio, and the tap density is 1.8~3.0g / cm3.

Description

technical field [0001] The present invention relates to a positive electrode active material for a lithium secondary battery, a method for producing the same, and a lithium secondary battery having excellent cycle characteristics and high battery capacity even at low temperatures. Background technique [0002] In recent years, with the rapid development of portable and wireless household appliances, lithium-ion secondary batteries are actually used in the power supply of small electronic products such as laptop personal computers, mobile phones, and cameras. Since Mizushima et al. revealed in 1980 that lithium cobalt oxide can be effectively used as a positive electrode active material for lithium-ion secondary batteries ("Material Research Bulletin" (Material Research Bulletin) Vol 15, P783-789 (1980)), in lithium In the field of ion secondary batteries, research and development related to lithium-based composite oxides has become very active, and many technical proposals h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02C01D15/00C01G51/00H01M4/04H01M4/36H01M4/525H01M10/05
CPCH01M4/131H01M4/1391H01M4/525H01M10/052Y02E60/10H01M4/02H01M4/04H01M4/58H01M10/05
Inventor 粟野英明大石义英根岸克幸
Owner NIPPON CHECMICAL IND CO LTD
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