Preparation method of novel lithium ion battery cathode material

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor control of pore size, poor ion conductivity, and low discharge specific capacity, and achieve performance improvement and specific capacity. Large, high-purity effects

Inactive Publication Date: 2017-10-24
DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent (CN201310087193.4) ​​discloses a preparation method of high specific capacity graphene-coated nickel-cobalt lithium manganate material, which mainly solves the low discharge specific capacity of nickel-cobalt lithium manganate existing in the prior art, As for high-nickel nickel-cobalt lithium manganese oxide, nickel and lithium are prone to mixed discharge inside the material, resulting in the precipitation of lithium. When the air humidity is high, the phenomenon of lithium precipitation is more serious and other technical problems.
It is covered with porous graphene, which solves the problem of poor ion conductivity caused by graphene completely and uniformly covering the positive electrode material of lithium-ion batteries, but its pore size is not easy to control, and the modified lithium-ion positive electrode material Conductivity needs to be further improved

Method used

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Embodiment 1

[0029] A preparation method for a novel lithium-ion battery cathode material, comprising the following steps:

[0030] (1) Mix and extract the LiCl aqueous solution and the polar organic matter, and separate the organic phase and the aqueous phase; among them, the polar organic matter is propanol; the volume ratio of the organic phase and the aqueous phase is 1:1; the concentration of the LiCl aqueous solution is 3mol / L ;

[0031] (2) Mix and stir the above-mentioned obtained organic phase and amine organic matter to obtain a reaction solution; and join the obtained reaction solution into a reactor with a stirring device, and feed carbon dioxide gas into the reaction solution while stirring. Stir the reaction at 10°C for 10 minutes, centrifuge after the reaction, and wash the obtained precipitate with absolute ethanol and deionized water in turn, and dry to obtain lithium carbonate; wherein, the amine organic compound is dodecyldimethyl tertiary amine; the reaction In the liq...

Embodiment 2

[0036] A preparation method for a novel lithium-ion battery cathode material, comprising the following steps:

[0037] (1) Mix and extract LiCl aqueous solution and polar organic matter, separate the organic phase and the aqueous phase; wherein, the polar organic matter is n-butanol; the volume ratio of the organic phase and the aqueous phase is 5:1; the concentration of the LiCl aqueous solution is 10mol / L;

[0038] (2) Mix and stir the above-mentioned obtained organic phase and amine organic matter to obtain a reaction solution; and join the obtained reaction solution into a reactor with a stirring device, and feed carbon dioxide gas into the reaction solution while stirring. Stir and react at 60°C for 60 minutes. After the reaction, centrifuge, and the precipitate obtained is washed with absolute ethanol and deionized water in turn, and dried to obtain lithium carbonate; wherein the organic amine is octanyl dimethyl tertiary amine; the reaction solution In, the volume fra...

Embodiment 3

[0043] A preparation method for a novel lithium-ion battery cathode material, comprising the following steps:

[0044] (1) Mix and extract LiCl aqueous solution and polar organic matter, separate the organic phase and the aqueous phase; wherein, the polar organic matter is n-pentanol; the volume ratio of the organic phase and the aqueous phase is 2:1; the concentration of the LiCl aqueous solution is 5mol / L;

[0045] (2) Mix and stir the above-mentioned obtained organic phase and amine organic matter to obtain a reaction solution; and join the obtained reaction solution into a reactor with a stirring device, and feed carbon dioxide gas into the reaction solution while stirring. Stir the reaction at 20°C for 50 minutes, centrifuge after the reaction, and wash the obtained precipitate with absolute ethanol and deionized water successively, and dry to obtain lithium carbonate; wherein, the amine organic substance is hexadecyldimethyl tertiary amine; the reaction In the liquid, ...

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PUM

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Abstract

The invention discloses a preparation method of a novel lithium ion battery cathode material. The method includes the following steps: 1) producing lithium carbonate; 2) mixing a cobalt salt with a complexing agent, adding the mixture as well as a precipitator into a reactor, performing a reaction to produce a solid, and sintering the solid with the lithium carbonate to prepare a lithium cobalt oxide material; 3) mixing deionized water and ethylene glycol, as solvents, with graphene oxide to obtain a graphene oxide dispersant, adding the self-made lithium cobalt oxide material, and performing ultrasonic treatment to obtain a mixed dispersant; 4) dropping the mixed dispersant to a receiving solution, of which temperature is controlled by a low-temperature freeze bath, successively performing freeze-drying and vacuum-drying to obtain a solid, adding the solid to a crosslinker solution for treatment, and treating the solid in a hydrazine hydrate solution; 5) drying the solid to prepare the lithium ion battery cathode material. The lithium ion battery cathode material has high stability, large specific capacity and excellent rate capability and cycle performance.

Description

Technical field: [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method of a novel lithium ion battery cathode material. Background technique: [0002] Lithium-ion batteries have the advantages of long cycle life, high power density, high energy density, and high voltage platform. They have been widely used in mobile phones, laptop computers and other electronic products, but it is still difficult to meet the requirements of electric vehicles, electric tools and other products. and safety requirements. Cathode material is a key factor affecting battery performance. [0003] At present, lithium cobalt oxide and lithium manganese oxide are the most commonly used cathode materials for lithium-ion batteries. Lithium cobalt oxide has high capacity and low safety. Lithium manganate has high safety but low capacity. Reaching 160mAh / g, the gram capacity of lithium manganese oxide is only 130mAh / g. How to improve the safety perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 陈东进
Owner DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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