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Positive electrode and lithium ion secondary battery

A secondary battery, lithium ion technology, used in secondary batteries, positive electrodes, battery electrodes, etc., can solve the problem of high price, and achieve the effect of improving charging rate characteristics and load discharge characteristics

Active Publication Date: 2019-09-20
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] On the other hand, in the non-aqueous electrolyte secondary battery using lithium cobalt oxide as the positive electrode active material, there is a limit in terms of capacity (currently, 140mAh / g or less is the use limit), and because cobalt as a constituent element is rare Metal is expensive, so there are big problems in terms of stable supply and cost

Method used

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  • Positive electrode and lithium ion secondary battery
  • Positive electrode and lithium ion secondary battery
  • Positive electrode and lithium ion secondary battery

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0090] The positive electrode of the first embodiment includes a positive electrode active material layer having a positive electrode active material on a positive electrode current collector, the positive electrode active material contains a compound represented by the following general formula (1) as a main component, and the positive electrode active material The reflectance Rc1 at a wavelength of 550 nm on the surface of the layer is 8.0%≦Rc1≦12.0%.

[0091] Li x Ni y M 1-y O z ……(1)

[0092] (0

[0093] In the positive electrode of the first embodiment, it is particularly preferable that the reflectance Rc1 at a wavelength of 550 nm on the surface of the positive electrode active material layer is 9.5%≦Rc1≦10.5%.

[0094] By setting the reflectance Rc1 on the surface of the positive electrode active material layer within the above-mentioned range, particularly favorable charge rate c...

no. 2 approach

[0112] The positive electrode of the second embodiment includes a positive electrode active material layer having a positive electrode active material on a positive electrode current collector, the positive electrode active material contains a compound represented by the following formula (2) as a main component, and the positive electrode active material layer The reflectance Rc2 on the surface at a wavelength of 550 nm is 3.5%≤Rc2≤7.8%.

[0113] Li x Ni y M 1-y O z ……(2)

[0114] (0

[0115] In the positive electrode of the second embodiment, it is particularly preferable that the reflectance Rc2 at a wavelength of 550 nm on the surface of the positive electrode active material layer is 4.3%≦Rc2≦6.3%.

[0116] By setting the reflectance Rc2 on the surface of the positive electrode active material layer to be within the above range, particularly favorable load-discharge characteristics c...

no. 3 approach

[0133] The positive electrode of the third embodiment includes a positive electrode active material layer having a positive electrode active material on a positive electrode current collector, the positive electrode active material contains a compound represented by the following formula (3) as a main component, and the positive electrode active material layer The reflectivity Rc3 on the surface at a wavelength of 550 nm is 2.0%≤Rc3≤5.8%.

[0134] Li x M y O z PO 4 ...(3)

[0135] (0

[0136] In the positive electrode of the third embodiment, it is particularly preferable that the reflectance Rc2 at a wavelength of 550 nm on the surface of the positive electrode active material layer is 3.2%≦Rc3≦4.9%.

[0137] By setting the reflectance Rc3 on the surface of the positive electrode active material layer to the above-mentioned range, particularly favorable load-di...

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Abstract

The present invention provides a positive electrode and a lithium ion secondary battery using the same, which can improve charge rate characteristics and load discharge characteristics. A positive electrode is provided with a positive electrode active material layer having a positive electrode active material, a conductive auxiliary agent, and a binder on the positive electrode current collector. A surface of the positive electrode active material layer has a reflectance Rc in a range of 2.0<=Rc<=12.0% at a wavelength of 550 nm.

Description

technical field [0001] The invention relates to a positive electrode and a lithium ion secondary battery. Background technique [0002] In recent years, with the rapid development of portability and cordlessness in home appliances, non-aqueous electrolyte secondary batteries are being put into practical use as power sources for small electronic devices such as notebook computers, mobile phones, and video cameras. The non-aqueous electrolyte secondary battery is composed of a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte. As the positive electrode active material used in the positive electrode, it is being actively developed in combination with lithium cobaltate (LiCoO 2 ) related research and development, so far, many proposals have been made. [0003] For example, among lithium secondary batteries equipped with a positive electrode having a lithium-transition metal composite oxide as an active material, a lithium secondary battery hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/62H01M10/0525
CPCH01M4/131H01M4/628H01M10/0525H01M4/133H01M4/505H01M4/525H01M10/0569H01M2004/021H01M2004/028H01M4/587Y02E60/10H01M2004/027H01M4/583
Inventor 大槻佳太郎佐藤哲三枝昌宽
Owner TDK CORPARATION