Positive electrode for lithium secondary batteries and lithium secondary battery using same

A technology of lithium secondary battery and positive electrode, which is applied in the field of positive electrode for lithium secondary battery and lithium secondary battery using the same, can solve the problems of low electronic conductivity and the like

Inactive Publication Date: 2013-03-27
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, since the electronic conductivity of the active material in the positive electrode is low, it cannot function sufficiently without a conductive material, so it is necessary to mix a conductive material

Method used

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  • Positive electrode for lithium secondary batteries and lithium secondary battery using same
  • Positive electrode for lithium secondary batteries and lithium secondary battery using same
  • Positive electrode for lithium secondary batteries and lithium secondary battery using same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0142] [Positive Electrode for Lithium Secondary Battery of First Embodiment]

[0143] Next, the positive electrode for a lithium secondary battery according to the first embodiment of the present invention will be described.

[0144] The positive electrode for a lithium secondary battery of the present invention is formed by forming a positive electrode active material layer containing the specific carbon black as a conductive material described in the present invention, an active material, and a binding material (binder) on a collector. into.

[0145]The positive electrode active material layer is usually produced by mixing the conductive material, the positive electrode active material, the binder material, and the thickener used if necessary, and forming a sheet, and pressing the sheet to the positive electrode. A current collector; or these materials are dissolved or dispersed in a liquid medium to form a slurry, which is applied to the positive electrode current collect...

no. 2 approach

[0412] [Positive Electrode for Lithium Secondary Battery of Second Embodiment]

[0413] Next, a positive electrode for a lithium secondary battery according to a second embodiment of the present invention will be described.

[0414] The positive electrode for a lithium secondary battery according to the second embodiment of the present invention is the same as the first embodiment except that the following binders are used as the binder.

[0415] [adhesive material]

[0416] The binding material used in the manufacture of the positive electrode active material layer is not particularly limited. In the case of the coating method, as long as it is a material that is dissolved or dispersed in the liquid medium used in the manufacture of the positive electrode, as a specific example, Examples include polyethylene, polypropylene, polyethylene terephthalate, polymethyl methacrylate, aromatic polyamide, cellulose, nitrocellulose and other resin-based polymers, SBR (styrene-butadiene...

Embodiment

[0486] The following examples and comparative examples are given to describe the present invention more specifically, but the present invention is not limited to the following examples unless the gist thereof is exceeded.

[0487] [active substance]

[0488] [Measurement method of physical properties]

[0489] The physical properties and the like of the lithium-transition metal-based compound powders produced in Examples and Comparative Examples described later were measured as follows.

[0490]

[0491] Obtained by ICP-AES analysis.

[0492]

[0493] Obtained by ICP-AES analysis.

[0494]

[0495] The X-ray photoelectron spectrometer "ESCA-5700" manufactured by Physical Electronics was used under the following conditions.

[0496] X-ray source: monochromatic AlKα

[0497] Analysis area: 0.8mm diameter

[0498] Outgoing angle: 65°

[0499] Quantitative method: Correction of Bls, Mn2p with sensitivity coefficient 1 / 2 、Co2p 3 / 2 , Ni2p 3 / 2 , The area of ​​each peak...

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PUM

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Abstract

Disclosed is a positive electrode for lithium secondary batteries which can impart greater capacity, greater output, and longer life to lithium secondary batteries. Also disclosed is a lithium secondary battery using same. Specifically disclosed is a positive electrode for a lithium secondary batteries which includes an active material and a conductive material, wherein the active material includes a lithium transition metal compound with a function whereby a lithium ion can be inserted into the compound and can be removed from the compound, said lithium transition metal compound has a peak of 800 - 1,000 cm-1 in the surface enhanced raman spectrum, and the conductive material includes carbon black that has a specific surface area by nitrogen adsorption (N2SA) of 70 - 300 m2 / g, and an average particle diameter of 10 - 35 nm. Also disclosed is a lithium secondary battery using the positive electrode.

Description

technical field [0001] The present invention relates to a positive electrode for lithium secondary batteries used in lithium secondary batteries and the like, and a lithium secondary battery using the positive electrode for lithium secondary batteries. Background technique [0002] In recent years, along with the miniaturization, weight reduction and high functionality of electronic equipment, the development of lithium secondary batteries used therein has been progressing. The positive electrodes used in these lithium secondary batteries usually require active materials with the function of storing or releasing electrons, but because the active materials, for example, the electronic conductivity is not necessarily high, and the electronic conductivity decreases during use, so only by a separate There are many cases where the active substances do not work effectively. Therefore, in order to form a conductive path between the active materials and between the active material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/13H01M4/36H01M4/505H01M4/525H01M4/62
CPCH01M4/36Y02E60/12H01M4/505H01M4/525B82Y30/00H01M4/583H01M4/62Y02T10/7011Y02E60/122H01M4/131C01G53/50C01P2004/20C01P2004/61C01P2006/11C01P2006/12C01P2006/80H01M4/1391H01M4/623H01M4/625H01M10/0525Y02E60/10H01M10/052
Inventor 高野彰司志塚贤治金呈珉草野智博木岛正人
Owner MITSUBISHI CHEM CORP
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