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Positive electrode active material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

A positive electrode active material and non-aqueous electrolyte technology, which is applied in the field of non-aqueous electrolyte secondary batteries, can solve the problems of shortened life of non-aqueous electrolyte secondary batteries and the inability to ensure the conductivity of the positive electrode, and achieve excellent output characteristics and cycle characteristics.

Inactive Publication Date: 2009-08-05
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the primary particle is much smaller than the secondary particle, if the secondary particle is divided into a plurality of primary particles, the conductivity of the positive electrode cannot be ensured.
Therefore, if the positive electrode active materials disclosed in Patent Documents 1 and 2 are used, the life of the nonaqueous electrolyte secondary battery may be shortened.

Method used

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  • Positive electrode active material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery
  • Positive electrode active material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery
  • Positive electrode active material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

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Embodiment 1

[0063] The schematic diagram of the manufacturing device for synthesizing hydroxide (the raw material of the positive electrode active material) is shown in figure 1 shown. As raw materials, 1 mol / L nickel sulfate aqueous solution, 1 mol / L manganese sulfate aqueous solution, 1 mol / L manganese sulfate aqueous solution, 1 mol / L A cobalt sulfate aqueous solution, a 5 mol / L ammonia solution, and a 5 mol / L sodium hydroxide solution were continuously supplied to the reaction tank 1 while being stirred. In addition, the sulfate aqueous solution of metal elements was supplied from the pumps 4 to 6 , the sodium hydroxide aqueous solution was supplied from the pump 7 , and the ammonia aqueous solution was supplied from the pump 8 .

[0064] Here, the manufacturing apparatus will be described. The manufacturing device is provided with conduits 9-11 for injecting the above-mentioned solution from pumps 4-8 into the reaction tank 1, and the sulfate aqueous solution of the above-mentioned...

Embodiment 2

[0115] use figure 1 The reaction tank 1 of the present invention produces hydroxide (raw material of positive electrode active material) mainly composed of Ni. As raw materials, 1 mol / L nickel sulfate aqueous solution, 1 mol / L cobalt sulfate aqueous solution, 1 mol / L cobalt sulfate aqueous solution, 1 mol / L Aluminum sulfate aqueous solution (depending on the situation, it can also be not 1mol / L aluminum sulfate aqueous solution but 1mol / L manganese sulfate aqueous solution), 5mol / L ammonia solution and 5mol / L sodium hydroxide solution while stirring continuously Supplied to reaction tank 1. Hereinafter, various composite hydroxides having different compositions were produced in the same manner as in Example 1.

[0116] Next, these composite hydroxides were washed with water, dried, and then fired in the air to form composite oxides. In this manner, various composite oxides having different element ratios of Ni, Co, and Al in the composite oxide and sizes of secondary partic...

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Abstract

Disclosed is a positive electrode active material for nonaqueous electrolyte secondary batteries, which contains Ni and is composed of secondary particles in each of which primary particles aggregate. In the cross section of a secondary particle, the total of the cross sectional areas of primary particles which are exposed at least partially in the surface of the secondary particle is not less than 40% of the total of the cross sectional areas of primary particles constituting the secondary particle.

Description

technical field [0001] The present invention relates to a positive electrode active material for a nonaqueous electrolyte secondary battery. Furthermore, the present invention relates to a nonaqueous electrolyte secondary battery having a positive electrode containing a specific positive electrode active material. Background technique [0002] In recent years, high capacity of batteries has been demanded, and nonaqueous electrolyte secondary batteries have attracted attention. In order to further increase the capacity of non-aqueous electrolyte secondary batteries, the material of the positive electrode active material has been studied. As the positive electrode active material, a lithium composite oxide containing Co (Co-based, such as LiCoO 2 ), but considering the cost, life and output power of non-aqueous electrolyte secondary batteries, lithium composite oxides containing Ni (Ni system), lithium composite oxides containing Mn (Mn system) or containing Ni and A lithiu...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/50H01M4/02H01M4/131H01M4/48H01M4/485H01M4/505H01M4/525H01M10/052H01M10/36
CPCH01M4/505C01G53/50H01M4/525C01P2002/77C01G53/44C01P2006/40C01G51/50C01P2004/03C01G51/44H01M10/0525C01G53/006C01P2004/61C01G45/1228Y02E60/122H01M4/131C01P2002/52H01M2004/021Y02E60/10H01M4/52H01M10/05
Inventor 冈田行广永山雅敏花冈茂平塚秀和奥山高弘
Owner PANASONIC CORP
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