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Positive electrode active material, non-aqueous electrolyte battery and method for manufacturing positive electrode active material

A technology of positive electrode active materials and particles, which is applied in the field of manufacturing positive electrode active materials, can solve problems such as easy to cause expansion, and achieve the effects of inhibiting decomposition, inhibiting gas generation, and high discharge capacity

Active Publication Date: 2015-09-02
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, in a secondary battery using a positive electrode active material composed of a lithium-transition metal composite oxide whose main body is nickel, such problems are encountered that the internal pressure rises with gas generation in the battery; In the battery, it is easy to cause swelling

Method used

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  • Positive electrode active material, non-aqueous electrolyte battery and method for manufacturing positive electrode active material
  • Positive electrode active material, non-aqueous electrolyte battery and method for manufacturing positive electrode active material
  • Positive electrode active material, non-aqueous electrolyte battery and method for manufacturing positive electrode active material

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Effect test

no. 1 approach

[0046] 1. First Embodiment (Structural Example of Positive Electrode Active Material)

[0047] 2. Second Embodiment (Example of a Cylindrical Nonaqueous Electrolyte Battery Using the Cathode Active Material According to the Present Disclosure)

no. 3 approach

[0048] 3. Third Embodiment (Example of a Laminated Film Type Nonaqueous Electrolyte Battery Using the Cathode Active Material According to the Present Disclosure)

no. 4 approach

[0049] 4. Fourth Embodiment (Example of Coin-Type Nonaqueous Electrolyte Battery Using the Cathode Active Material According to the Present Disclosure)

[0050] 1. The first embodiment

[0051] In the first embodiment of the present disclosure, the composition of the positive electrode active material and the manufacturing method are described (1-1) The composition of the positive electrode active material

[0052] The positive electrode active material according to the first embodiment of the present disclosure is a lithium composite oxide particle mainly composed of nickel (Ni) and containing cobalt (Co) as a transition metal together with nickel (Ni), Also, the concentration of cobalt (Co) on the particle surface is high. The positive electrode active material in which the concentration of cobalt (Co) on the particle surface is made high can deactivate the particle surface. According to the positive electrode active material according to the first embodiment of the presen...

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Abstract

A positive electrode active material includes: a secondary particle obtained upon aggregation of a primary particle that is a lithium complex oxide particle in which at least nickel (Ni) and cobalt (Co) are solid-solved as transition metals, wherein an average composition of the whole of the secondary particle is represented by the following formula (1): LixCoyNizM1-y-zOb-aXa   Formula (1) wherein an existent amount of cobalt (Co) becomes large from a center of the primary particle toward the surface thereof; and an existent amount of cobalt (Co) in the primary particle existing in the vicinity of the surface of the secondary particle is larger than an existent amount of cobalt (Co) in the primary particle existing in the vicinity of the center of the secondary particle.

Description

technical field [0001] The present disclosure relates to a cathode active material, a nonaqueous electrolyte battery, and a method of manufacturing the cathode active material. More specifically, the present disclosure relates to a positive electrode active material in which cobalt (Co) exists in a large amount on the particle surface relative to the entire particle, a nonaqueous electrolyte battery, and a method of manufacturing the positive electrode active material. Background technique [0002] In recent years, with the popularization of portable devices such as video cameras and laptop personal computers, the demand for miniaturized high-capacity secondary batteries has increased. Almost all secondary batteries are nickel-cadmium batteries or nickel-hydrogen batteries, which use alkaline electrolyte solutions. However, in such batteries, the voltage is as low as about 1.2 volts, and it is difficult to increase the energy density. For this reason, research has been con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M10/0427Y02E60/122H01M4/582C01P2006/42H01M4/362C01P2002/85H01M2004/021H01M4/525H01M10/052H01M10/0566H01M10/0587C01G53/42Y02E60/10
Inventor 柳原明日辉大山有代工藤喜弘李国华
Owner MURATA MFG CO LTD