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Positive electrode active material for non-aqueous electrolyte secondary battery

A technology of positive active material and non-aqueous electrolyte, which is applied in the direction of non-aqueous electrolyte storage battery, secondary battery, battery electrode, etc. It can solve the problems of the stability of the crystal structure of positive active material, and achieve low charge and discharge capacity and output characteristics. And the effect of improving cycle characteristics

Inactive Publication Date: 2012-10-31
NICHIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are difficulties in the stability of the crystal structure of the cathode active material during charge and discharge.

Method used

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  • Positive electrode active material for non-aqueous electrolyte secondary battery
  • Positive electrode active material for non-aqueous electrolyte secondary battery
  • Positive electrode active material for non-aqueous electrolyte secondary battery

Examples

Experimental program
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preparation example Construction

[0062] What is necessary is just to select a well-known method as the preparation method of a raw material, and to combine it as the case may be. For example, simple substances of elements constituting the target composition, oxides, or compounds that become oxides at high temperatures can be mixed using various mixers. Alternatively, a water-soluble compound of elements constituting the target composition may be dissolved in a solvent such as pure water, precipitated with an acid, alkali, complexing agent, etc., and then separated and filtered. Alternatively, pre-firing may be further performed to form a composite oxide in advance. Here, only the raw material compound of lithium is additionally added and mixed to obtain the final mixed raw material.

[0063] The raw material of the element M' preferably has a small particle size. When the starting material is a small particle, the composite oxide of lithium and M' can be m M'O (m+v) / 2 (wherein, 2≤m≤6, v is the oxidation n...

Embodiment 1

[0102] Adjust the stirring state of pure water in the reaction tank, and dropwise add nickel sulfate aqueous solution, cobalt sulfate aqueous solution and manganese sulfate aqueous solution, in terms of molar ratio, so that the flow ratio reaches Ni:Co:Mn=1:1:1. After the dropwise addition, the temperature of the liquid was kept at 65° C., and a certain amount of aqueous sodium hydroxide solution was added dropwise to obtain nickel / cobalt / manganese co-precipitated hydroxide. The obtained co-precipitated hydroxide was washed with water, filtered, separated, and thermally decomposed in air at 320° C. to obtain nickel / cobalt / manganese composite oxide. The obtained composite oxide, lithium carbonate, and tungsten (VI) oxide with an average particle diameter of 0.5 μm were mixed so that Li:(Ni+Co+Mn):W=1.15:1:0.005 to obtain a mixed raw material. The obtained mixed raw material was fired at 960° C. for 15 hours in an air atmosphere to obtain a sintered body. The obtained sintered ...

Embodiment 2

[0104] A nickel / cobalt / manganese composite oxide was obtained in the same manner as in Example 1. The obtained composite oxide, lithium carbonate, and tungsten (VI) oxide were mixed so that Li:(Ni+Co+Mn):W=1.15:1:0.008 to obtain a mixed raw material. The obtained mixed raw material was fired at 990° C. for 15 hours in an air atmosphere to obtain a sintered body. The obtained sintered body is pulverized and passed through a dry sieve to obtain the composition formula Li 1.15 Ni 0.333 co 0.333 mn 0.333 W 0.008 o 2 Indicates the positive active material.

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Abstract

A positive electrode active material for non-aqueous electrolyte secondary battery, comprising particles of a lithium transition metal complex oxide represented by the general formula: Li a Ni 1-x-y-z Co x Mn y M' z M'' w O 2 wherein 1.00 a 1.25, 0 x 0.5, 0 y 0.5, 0.002 0.01, 0 w 0.05, M' is at least one kind of an element selected from W, Mo, Nb and Ta, and M'' is at least one kind of an element selected from Zr, Al, Mg, Ti, B and V, and a complex oxide of lithium, and M' exists in the region ranging from an outermost surface of positive electrode active material particles to a depth of about 1 nm in the direction of center.

Description

technical field [0001] The present invention relates to a positive electrode active material used in nonaqueous electrolyte secondary batteries such as lithium ion secondary batteries. In particular, it relates to a positive electrode active material with improved output characteristics, storage characteristics, and cycle characteristics. Background technique [0002] In recent years, nonaqueous electrolyte secondary batteries have begun to be used as power sources for portable devices such as VTRs, mobile phones, and notebook computers due to the popularization, high performance, and miniaturization, as well as for the purpose of use at high or low temperatures. In addition, in order to cope with recent environmental problems, non-aqueous electrolyte secondary batteries are also attracting attention as power batteries for electric vehicles and the like. When used in electric vehicles, high-output batteries capable of responding to quick starts and rapid accelerations, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M10/0525
CPCH01M4/505H01M4/525C01G53/50C01G53/42Y02T10/7011C01P2006/40C01G51/50C01P2002/54C01P2006/11C01G45/1228C01P2004/86Y02E60/122C01P2004/80C01P2002/52H01M10/052H01M4/366H01M2004/021B82Y30/00C01P2006/80Y02E60/10
Inventor 河井健太
Owner NICHIA CORP