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Cathode active material, method of manufacturing it, cathode, and battery

A cathode active material, cathode technology, applied in the direction of active material electrodes, secondary batteries, battery electrodes, etc., can solve problems such as characteristic degradation, achieve high capacity and high voltage, improve high temperature characteristics or cycle characteristics, and improve chemical stability Effect

Active Publication Date: 2009-08-12
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, in the case of using lithium manganate, there is such a disadvantage that characteristics are lowered due to elution of manganese (see Japanese Patent Laid-Open No. 2987358 and Japanese Unexamined Patent Application Laid-Open No. 2004-227869)

Method used

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  • Cathode active material, method of manufacturing it, cathode, and battery
  • Cathode active material, method of manufacturing it, cathode, and battery
  • Cathode active material, method of manufacturing it, cathode, and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1 and 1-2

[0129] The cathode active material was formed as follows. First, mix 38.1 parts by weight of lithium carbonate (Li 2 CO 3 ), 113.0 parts by weight of cobalt carbonate (CoCO 3 ), 23.4 parts by weight of aluminum hydroxide (Al(OH) 3 ) and 16.9 parts by weight of magnesium carbonate (MgCO 3 ) and pulverized with a ball mill. After the resultant was calcined at 650° C. in air for 5 hours, the resultant was sintered at 950° C. in air for 20 hours to form composite oxide particles. The average composition of the formed composite oxide particles was examined by ICP spectrometry. The result is Li 1.03 co 0.95 al 0.03 Mg 0.02 o 2.02 . Next, the composite oxide particles are pulverized, and the particle diameter is adjusted. The average particle diameter measured by the laser light scattering method was 11 μm.

[0130] Next, 20 parts by weight of the composite oxide particles were stirred and dispersed in 300 parts by weight of a 2N lithium hydroxide aqueous solution at 80 ...

Embodiment 2-1 to 2-4

[0142] A cathode active material and a secondary battery were fabricated in the same manner as in Example 1-1 except that the average composition of the composite oxide particles was changed. In embodiment 2-1, except mixing the lithium carbonate of 38.1 parts by weight, the cobalt carbonate of 116.5 parts by weight, the aluminum hydroxide of 7.8 parts by weight and the magnesium carbonate of 8.4 parts by weight, with the same as in embodiment 1-1 form composite oxide particles. When its average composition was detected in the same manner as in Example 1-1, the result was Li 1.03 co 0.98 Al 0.01 Mg 0.01 o 2.02 .

[0143] In Example 2-2, in addition to mixing the lithium carbonate of 38.1 parts by weight and the cobalt carbonate of 116.5 parts by weight, and adding and mixing the resultant to the titanium ethoxide ((C 2 h 5 O) 4 Composite oxide particles were formed in the same manner as in Example 1-1 except that Ti) was dissolved in a solution obtained in absolute eth...

Embodiment 3-1 to 3-3

[0151] A cathode active material and a secondary battery were manufactured in the same manner as in Example 2-1 except that the method of forming the coating layer was changed. In Example 3-1, except that 3.20 parts by weight of nickel nitrate and 3.30 parts by weight of manganese nitrate were mixed, and the resultant was added to pure water to obtain 20 parts by weight of an aqueous solution, and the entire 20 parts by weight of the aqueous solution was placed in A cathode active material was formed in the same manner as in Example 2-1, except that it was added within one hour to the lithium hydroxide aqueous solution in which the composite oxide particles were dispersed. That is, the addition amount of nickel nitrate and manganese nitrate was twice that of Example 2-1.

[0152] In Example 3-2, except that 0.86 parts by weight of aluminum nitrate (Al(NO 3 ) 3 9H 2 O) A commercially available reagent was added to 3.20 parts by weight of nickel nitrate and 3.30 parts by weig...

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Abstract

A cathode active material capable of increasing a capacity and improving high temperature characteristics or cycle characteristics, a method of manufacturing it, a cathode using the cathode active material, and a battery using the cathode active material are provided. In a cathode active material contained in a cathode, a coating layer is provided on at least part of a complex oxide particle containing at least lithium (Li) and cobalt (Co). The coating layer is an oxide which contains lithium (Li) and at least one of nickel (Ni) and manganese (Mn).

Description

[0001] Cross References to Related Applications [0002] The present invention includes Japanese patent applications JP2005-156030 filed at the Japan Patent Office on May 27, 2005, Japanese patent applications JP2005-156031 filed at the Japan Patent Office on May 27, 2005, and Japanese patent applications filed at the Japan Patent Office on May 27, 2005. The subject matter of Japanese Patent Application JP2005-156033 filed in the Japanese Patent Office, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a positive electrode active material containing a composite oxide including lithium (Li) and cobalt (Co), a method for manufacturing the positive electrode active material, a positive electrode using the positive electrode active material, and a battery using the positive electrode active material . Background technique [0004] In recent years, portable devices such as combined cameras and notebook pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04H01M10/40H01M4/02C01G51/00C01G53/00H01M4/36H01M4/505H01M4/525H01M10/05
CPCY02E60/122Y02E60/10
Inventor 渡辺春夫荻须谦二森田耕诗相马正典细谷洋介东秀人大山有代
Owner MURATA MFG CO LTD
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