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

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

Active Publication Date: 2007-01-17
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 positive electrode active material is formed as follows. First, 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 crushed with a ball mill at the same time. After the resultant was calcined in air at 650 degrees Celsius for 5 hours, the resultant was sintered in air at 950 degrees Celsius for 20 hours to form composite oxide particles. The average composition of the formed composite oxide particles was checked 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 crushed, and the particle size is adjusted. The average particle size measured by the laser 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 solut...

Embodiment 2-1 to 2-4

[0141] Except for the change in the average composition of the composite oxide particles, a positive electrode active material and a secondary battery were manufactured in the same manner as in Example 1-1. In Example 2-1, except that 38.1 parts by weight of lithium carbonate, 116.5 parts by weight of cobalt carbonate, 7.8 parts by weight of aluminum hydroxide, and 8.4 parts by weight of magnesium carbonate were mixed, the same as in Example 1-1 was used. Way to form composite oxide particles. When the average composition was tested 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 .

[0142] In Example 2-2, in addition to mixing 38.1 parts by weight of lithium carbonate and 116.5 parts by weight of cobalt carbonate, and the resultant was added and mixed by adding 45.6 parts by weight of titanium ethoxide ((C 2 H 5 O) 4 The Ti) was dissolved in the solution obtained in absolute ethanol, and composite oxide particles were formed in the same...

Embodiment 3-1 to 3-3

[0149] Except that the method of forming the coating layer was changed, the positive electrode active material and the secondary battery were manufactured in the same manner as in Example 2-1. 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 mixed in The positive electrode active material was formed in the same manner as in Example 2-1 except that it was added to the lithium hydroxide aqueous solution in which the composite oxide particles were dispersed within one hour. That is, the addition amount of nickel nitrate and manganese nitrate was twice that of Example 2-1.

[0150] In Example 3-2, in addition to 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 nitrat...

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Abstract

Provided are a cathode active material capable of increasing capacity and improving high-temperature characteristics and cycle characteristics, a manufacturing method thereof, a cathode using the cathode active material, and a battery using the cathode active material. In the positive electrode active material contained in the positive electrode, a coating layer is provided on at least part of the composite oxide particles containing at least oxides of lithium (Li) and cobalt (Co). The coating layer is an oxide containing lithium (Li) and at least one of nickel (Ni) and manganese (Mn).

Description

[0001] Cross-references to related applications [0002] The present invention includes the Japanese patent application JP 2005-156030 filed at the Japan Patent Office on May 27, 2005, the Japanese patent application JP2005-156031 filed at the Japan Patent Office on May 27, 2005, and the Japanese patent application JP2005-156031 filed at the Japanese Patent Office on May 27, 2005. The subject matter of Japanese Patent Application JP2005-156033 filed by the Japan Patent Office, the entire contents of these applications are incorporated herein 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 of 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 a c...

Claims

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Application Information

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Patent Type & Authority Applications(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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