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Manufacturing method of positive electrode active material and positive electrode active material

A technology of active materials and positive electrodes, which is applied in the field of positive electrode active materials, can solve the problem of low charge and discharge cycle life, and achieve the effect of mutual compatibility of capacity retention and high battery capacity

Active Publication Date: 2010-06-23
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, with the further miniaturization and high functionality of portable devices, lithium ion secondary batteries are currently expected to solve the problem of low charge-discharge cycle life in the aforementioned generally used positive electrode active materials

Method used

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  • Manufacturing method of positive electrode active material and positive electrode active material
  • Manufacturing method of positive electrode active material and positive electrode active material
  • Manufacturing method of positive electrode active material and positive electrode active material

Examples

Experimental program
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Effect test

preparation example Construction

[0062] [Manufacturing method of positive electrode active material]

[0063] Next, a method for producing a positive electrode active material according to an embodiment of the present invention will be described. As the composite oxide particles, composite oxide particles containing lithium and cobalt that are generally available as positive electrode active materials can be used. According to specific circumstances, composite oxide particles obtained by crushing secondary particles with a ball mill, a pounder, or the like may also be used.

[0064] Composite oxide particles containing lithium and cobalt constituting the positive electrode active material having the chemical composition represented by the above general formula (1) can be produced by known techniques. In an embodiment according to the present invention, as a further step, the composite oxide particles containing lithium cobalt oxide prepared by known techniques are additionally treated, thereby achieving surf...

Embodiment approach 1

[0084] [Structure of non-aqueous electrolyte secondary battery]

[0085] figure 1 A cross-sectional structure of a nonaqueous electrolyte battery (hereinafter appropriately referred to as "secondary battery") according to one embodiment of the present invention is shown. This battery is, for example, a lithium ion secondary battery.

[0086] Such as figure 1 As shown, the battery is of a so-called cylindrical type and has a wound electrode body 20 in which a strip-shaped positive electrode 21 and a strip-shaped negative electrode 22 are wound inside a substantially hollow cylindrical battery can 11 via a separator 23 . For example, the battery can 11 is composed of nickel (Ni)-plated iron (Fe), and is closed at one end and opened at the other end. A pair of insulating plates 12 and 13 are placed vertically against the wound peripheral surface inside the battery can 11 so that the wound electrode body 20 is interposed therebetween.

[0087] At the open end of the battery ca...

Embodiment approach 2

[0123] [Structure of non-aqueous electrolyte secondary battery]

[0124] figure 2 A structure of a nonaqueous electrolyte secondary battery using the positive electrode active material according to the embodiment of the present invention is shown. Such as figure 2 As shown, the nonaqueous electrolyte secondary battery is a battery in which a battery element 30 is housed in an armoring material 39 made of a moisture-proof laminated film and the periphery of the battery element 30 is sealed by welding. The battery element 30 is provided with a positive electrode terminal 35 and a negative electrode terminal 36 which are inserted into a protective material 39 and protrude outward. In order to improve the adhesiveness to the protective material 39 , an adhesive film 37 is coated on both surfaces of each of the positive electrode terminal 35 and the negative electrode terminal 36 .

[0125] For example, the protective material 39 has a laminated structure in which an adhesive ...

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Abstract

A positive electrode active material for nonaqueous electrolyte secondary batteries includes a coating layer containing at least nickel (Ni) and / or manganese (Mn) on the surface of a complex oxide particle containing lithium (Li) and cobalt (Co), wherein a binding energy value obtained by analysis of a surface state by an ESCA surface analysis on the surface of the coating layer is 642.0 eV or more and not more than 642.5 eV in an Mn2p3 peak, and a peak interval of Co-Mn is 137.6 eV or more and not more than 138.0 eV.

Description

technical field [0001] The present invention relates to positive electrode active materials for nonaqueous electrolyte secondary batteries. In particular, the present invention relates to a method for producing a positive electrode active material capable of suppressing gas generation in a battery, and the positive electrode active material. Background technique [0002] In recent years, electronic devices such as mobile phones and personal notebook computers have been recognized as basic technologies supporting a highly computerized society because of the remarkable development of portable electronic technologies. Moreover, research and development on the highly functionalization of these electronic devices is actively underway, and the power consumption of these electronic devices is steadily increasing in proportion. On the other hand, it is necessary to drive these electronic devices for a long time, and the densification of a high-energy secondary battery as a driving ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M10/0525
CPCH01M4/505Y02E60/122H01M4/525H01M4/366Y02E60/10
Inventor 武井悠记
Owner MURATA MFG CO LTD
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