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Cathode active material, preparation method thereof, cathode material and lithium ion battery

A cathode active material, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of poor rate performance of cathode active materials, and achieve the effect of improving rate performance

Active Publication Date: 2014-12-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem of poor rate performance of positive electrode active materials in the prior art, the present invention provides a positive electrode active material with excellent rate performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The preparation method of the positive electrode active material disclosed in the present invention comprises:

[0020] a. Mix the lithium source, the manganese source, and the first silicon source in an organic solvent, dry after ball milling, and then perform the first heat treatment under an inert atmosphere to obtain a precursor;

[0021] b. Mixing and dispersing the precursor, the second silicon source and the carbon source in an organic solvent, drying, and performing a second heat treatment under an inert atmosphere to obtain a positive electrode active material.

[0022] According to the present invention, the lithium source is various lithium salts known in the art, preferably, the lithium source is selected from lithium acetate and / or lithium nitrate. Likewise, the manganese sources mentioned above are also various manganese salts commonly used in the art. Preferably, the manganese sources are selected from manganese carbonate and / or manganese oxalate.

[002...

Embodiment 1

[0057] This example is used to illustrate the positive electrode active material disclosed in the present invention and its preparation method.

[0058] Mix 0.23mol of lithium acetate, 0.1mol of manganese carbonate and 0.1mol of propyl orthosilicate in 0.8mol of petroleum ether, and then ball mill at a speed of 600r / min for 6h in a ball mill. The above-mentioned ball-milled product was then dried at 80° C. for 48 h. The dried product was first heat-treated at 500° C. for 40 h in a nitrogen atmosphere to obtain a precursor.

[0059] Mix 100 parts by weight of the precursor, 4 parts by weight of propyl orthosilicate, and 20 parts by weight of hydroxypropyl methylcellulose in petroleum ether (the molar ratio of petroleum ether to propyl orthosilicate is 2:1), and then ultrasonic Disperse for 8 hours and dry. In a nitrogen atmosphere, a second heat treatment was performed at 850° C. for 3 hours to obtain the positive electrode active material A1 in which the surface of the lithi...

Embodiment 2

[0063] This example is used to illustrate the positive electrode active material disclosed in the present invention and its preparation method.

[0064] Mix 0.2mol of lithium nitrate, 0.1mol of manganese oxalate and 0.1mol of butyl orthosilicate in 0.2mol of tetrahydrofuran, and then ball mill in a ball mill at a speed of 300r / min for 12h. The above-mentioned ball-milled product was then dried at 150° C. for 10 h. The dried product was subjected to the first heat treatment at 300° C. for 10 h in an argon atmosphere, and then the second heat treatment was carried out at 800° C. for 40 h to obtain the precursor.

[0065] Mix 100 parts by weight of the precursor, 0.2 parts by weight of butyl orthosilicate, and 5 parts by weight of hydroxypropyl cellulose in tetrahydrofuran (the molar ratio of tetrahydrofuran to butyl orthosilicate is 8:1), then ultrasonically disperse for 8 hours, and dry Dry. In an argon atmosphere, a second heat treatment was performed at 500° C. for 10 hours...

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Abstract

The invention provides a cathode active material, a preparation method thereof, a cathode material and a lithium ion battery. The cathode active material has an inner core and a shell, wherein the inner core is lithium magnesium silicate; the shell comprises carbon and silicate; and the average particle size of the cathode active material is 30 to 60nm. The lithium magnesium silicate inner core is prepared at first, and then the shell comprising the carbon and the silicate is formed on the surface of the inner core, so that the rate capability of the lithium ion battery prepared from the cathode active material is greatly improved.

Description

technical field [0001] The invention relates to a positive electrode active material and a preparation method thereof, a positive electrode material and a lithium ion battery. Background technique [0002] The increasingly prominent energy problems and the deteriorating environmental problems have prompted countries to continue to devote themselves to the development of new energy sources. Lithium-ion battery is one of the most promising new energy sources. It not only has the advantages of high energy density and long cycle life, but also is environmentally friendly and clean energy. The source of power. [0003] After more than ten years of development, lithium-ion secondary batteries have been widely used in various portable electronic products, and are actively researching and developing energy storage devices for electric vehicles and hybrid vehicles. The cathode materials of current commercial lithium-ion batteries are based on oxide cathode materials, especially lay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/1397H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 胡栋杰袁学远
Owner BYD CO LTD
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