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Positive electrode active substance used in lithium secondary battery, and manufacturing method thereof

A cathode active material, lithium secondary battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as uneven distribution, unstable supply of raw materials, and cost, and achieve a simple manufacturing method and excellent cycle characteristics. Effect

Active Publication Date: 2013-09-25
NANTONG RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using LiCoO 2 When used as a positive electrode active material, the discharge capacity is about 160mA / g, and it is practically used as LiCo0 2 Cobalt as a raw material is a scarce resource and is unevenly distributed, so it costs money and the supply of raw materials is unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Add lithium carbonate (average particle size: 5 μm), the aforementioned aggregated composite hydroxide containing nickel atoms, cobalt atoms, and manganese atoms, and titanium oxide (average particle size: 3.2 μm), and fully dry mix to obtain a uniform mixture of these raw materials. mixture. Next, the temperature was raised to 600° C. over 1 hour, and further raised to 945° C. over 3 hours, then kept at 945° C. for 10 hours, and fired in the air. After the calcination, the cooled calcined product was pulverized to obtain a positive electrode active material sample.

[0073] The average particle diameter of the primary particles obtained by the scanning electron microscope observation of this positive electrode active material sample is 0.5 μm, the average particle diameter of the secondary particles obtained by the laser particle size distribution measurement method is 8.3 μm, and the BET specific surface area is 0.92m 2 / g. Here, the average particle diameter of th...

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Abstract

The invention discloses a positive electrode active substance used in lithium secondary battery, and a manufacturing method thereof. The positive electrode active substance is a lithium composite oxide of a positive electrode active substance comprising Ti atoms, wherein the substance has a general formula of LixNi1-y-zCoyMnzTiaO2. x is no lower than 0.95 and no higher than 1.30; y is no lower than 0 and no higher than 0.6; z is no lower than 0 and no higher than 0.8; and y+z is smaller than 1, and a is no lower than 0 and no higher than 0.1. According to the manufacturing method, a lithium compound, a compound comprising nickel atoms, cobalt atoms and manganese atoms, and titanium oxide are mixed; and the mixture is calcined, such that the positive electrode active substance comprising the lithium composite oxide with the general formula is obtained. With the positive electrode active substance, lithium secondary battery with excellent circulation characteristics can be obtained. Also, the preparation method is simple. With the method, the positive electrode active substance can be manufactured through an industrial beneficial method.

Description

[0001] technical field [0002] The invention belongs to the technical field of battery manufacturing, and in particular relates to a positive electrode active material for a lithium ion secondary battery and a manufacturing method thereof, so as to manufacture a lithium ion secondary battery with excellent cycle characteristics. Background technique [0003] In recent years, with the popularization and miniaturization of portable devices such as mobile phones and notebook computers, non-aqueous electrolyte secondary batteries such as lithium-ion secondary batteries have gradually been used as their power sources. Moreover, from the perspective of coping with recent environmental problems, it is also attracting attention as a power battery for electric vehicles and the like. [0004] As a positive electrode active material for lithium secondary batteries, LiCoO is generally widely used. 2 (lithium cobaltate) as a substance that can constitute a 4V-class secondary battery. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525
CPCY02E60/10
Inventor 张新龙陈亮王梁梁刘奇朱祥
Owner NANTONG RESHINE NEW MATERIAL
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