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Lithium-transition metal oxide powder and method of producing the same, positive electrode active material for lithium ion battery, and lithium ion secondary battery

a technology of lithium ion battery and metal oxide powder, which is applied in the direction of batteries, cell components, niobium compounds, etc., can solve the problems of lithium ion secondary batteries, and achieve the effects of increasing the electric resistance value of lithium-transition metal oxide powder, and low powder compact resistan

Inactive Publication Date: 2016-02-11
DOWA HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a method for improving the powder compact resistance of lithium cobaltate powder used as the positive electrode active material in all-solid lithium batteries. The method involves coating the surface of the powder with lithium niobate to prevent the formation of high resistance parts on the surface of the positive electrode. However, the inventors found that the coated powder had an increased electric resistance value due to the presence of organic matter and carbon. To address this issue, the inventors developed a method involving sintering the powder at a high temperature to remove the organic matter and carbon. As a result, the surface-coated powder with less organic matter and carbon had lower powder compact resistance.

Problems solved by technology

The non-aqueous solvent electrolyte is flammable, and therefore the lithium ion secondary battery has a problem to be solved regarding safety.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0065]The lithium-transition metal oxide powder with the surface coated with lithium niobate of example 1 was produced by a method described below.

[0066]Lithium cobaltate (LiCoO2) powder having an average particle size of 5.14 μm and BET value of 0.234 m2 / g, was prepared.

[0067]Aqueous hydrogen peroxide was prepared, in which 5.8 g of hydrogen peroxide solution having a concentration of 30 mass % was added into 10 g of pure water. 0.6 g of niobium oxide (Nb2O5.6.1H2O(content of Nb2O5 was 70.7%)) was added into the aqueous hydrogen peroxide. After addition of the niobium oxide, 0.96 g of aqueous ammonia having a concentration of 28 mass % was further added, and the mixed solution was sufficiently stirred, to thereby obtain a transparent solution. 0.134 g of lithium hydroxide. 1 hydrate(LiOH.H2O) was added into the obtained transparent solution, to thereby obtain an aqueous solution containing lithium and complex niobate.

[0068]The aqueous solution containing the lithium and the complex...

example 2

[0077]The lithium cobaltate powder with the surface coated with the lithium niobate according to example 2 was produced similarly to example 1, excluding a point that 0.220 g of lithium nitrate (LiNO3) was used instead of 0.134 g of lithium hydroxide.1 hydrate (LiOH.H2O), as the lithium compound in example 1.

[0078]An evaluation similar to example 1 was performed to the lithium cobaltate powder with the surface coated with the lithium niobate in example 2. The evaluation result thereof is shown in table 1.

example 3

[0079]The lithium cobaltate powder with the surface coated with the lithium niobate according to example 3 was produced similarly to example 1, excluding a point that 0.204 g of lithium sulfate.1 hydrate (Li2SO4.H2O) was used instead of 0.134 g of lithium hydroxide.1 hydrate (LiOH.H2O), as the lithium compound used in example 1.

[0080]The evaluation similar to example 1 was performed to the lithium cobaltate powder with the surface coated with the lithium niobate in example 3. The evaluation result thereof is shown in table 1.

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PUM

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Abstract

There is provided a lithium-transition metal oxide powder with a coating layer containing lithium niobate formed on a part or the whole part of a surface of a lithium-transition metal oxide particle and having a low powder compact resistance, and a positive electrode active material for a lithium ion battery containing the lithium-transition metal oxide powder. Specifically, there is provided the lithium-transition metal oxide powder composed of a lithium-transition metal oxide particle with a part or the whole part of a surface coated with a coating layer containing lithium niobate, wherein a carbon-content is 0.03 mass % or less.

Description

[0001]This is a Divisional of application Ser. No. 13 / 818,264 filed Feb. 21, 2013, which is a National Stage Application of PCT / JP2011 / 071444 filed Sep. 21, 2011. The entire disclosures of the prior applications are hereby incorporated by reference herein their entirety.TECHNICAL FIELD[0002]The present invention relates to a lithium-transition metal oxide powder and a method of producing the same, a positive electrode active material for a lithium ion battery, and a lithium ion secondary battery.DESCRIPTION OF RELATED ART[0003]The lithium ion secondary battery is characterized in that energy density is high, and an operation at a high voltage is enabled, and therefore is used for an information device such as a cellular phone as a secondary battery that is easy to be miniaturized and reduced in weight. Further, in recent years, demand as the secondary battery for a large power of a hybrid car, etc., has been increased.[0004]A non-aqueous solvent electrolyte in which salt is dissolve...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/36H01M4/485H01M10/0525
CPCH01M4/366H01M10/0525H01M2220/20H01M2220/30H01M4/485B82Y30/00C01G33/00C01G51/42C01P2002/52C01P2004/61C01P2004/64C01P2006/12C01P2006/40C01P2006/80H01M4/131H01M4/505H01M4/525Y02E60/10C01G51/00H01M4/36H01M4/0452H01M4/1391Y02T10/70
Inventor NAGATOMI, AKIRA
Owner DOWA HLDG CO LTD
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