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Lithium battery cathode material with nitrogen-doped graphene and lithium molybdate and preparation method of lithium battery cathode material

A technology of nitrogen-doped graphene and positive electrode materials, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of processing performance, charge-discharge cycle, and unsatisfactory rate performance, and achieve cycle stability and rate performance Effects of improved performance, improved electrochemical performance, and improved transport performance

Inactive Publication Date: 2018-04-24
GEM WUXI ENERGY MATERIAL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above problems, the object of the present invention is to provide a lithium ion ternary positive electrode material co-coated with nitrogen-doped graphene and lithium molybdate and a preparation method thereof, aiming to solve the problems of the existing nickel-cobalt lithium manganese oxide ternary material. Processing performance, charge-discharge cycle, and rate performance are not very satisfactory technical problems

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  • Lithium battery cathode material with nitrogen-doped graphene and lithium molybdate and preparation method of lithium battery cathode material

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preparation example Construction

[0019] The lithium battery cathode material preparation method of nitrogen-doped graphene and lithium molybdate provided by the invention comprises the following steps:

[0020] 1) Disperse graphite oxide and nitrogen source in water to form a dispersion, add ascorbic acid and heat to obtain a gel.

[0021] In the lithium battery cathode material finally prepared in the present invention, the amount of nitrogen-doped graphene added is calculated as graphite oxide, and the amount of graphite oxide added is 0.1% to 5% of the mass of the lithium battery cathode material. The graphite oxide and the nitrogen source are dispersed The concentration of the dispersion obtained in water is 0.1-5 mg / mL, and the nitrogen source is urea or thiourea.

[0022] 2) Add molybdenum source and lithium battery ternary material into the gel, stir and evaporate to dryness to obtain a mixed material.

[0023] The molybdenum source is molybdenum trioxide, wherein the molybdenum element is added in an...

Embodiment 1

[0029] Add 200mg of graphite oxide and 2g of urea to 100mL of water to form a dispersion, add 0.75g of ascorbic acid, stir at 90°C for 1.5h to form a semi-gel, then add 40mg of molybdenum trioxide and 20g of NCM622 positive electrode material, then at 80°C Stir and dry for 2h. The dried material was transferred to an argon atmosphere muffle furnace for heat treatment at 600° C. for 5 hours, and cooled to obtain a lithium battery cathode material co-coated with nitrogen-doped graphene and lithium molybdate.

Embodiment 2

[0031] Add 500mg of graphite oxide and 4g of urea to 100mL of water to form a dispersion, add 1.5g of ascorbic acid, stir at 80°C for 2h to form a semi-gel, then add 1.0g of molybdenum trioxide and 500g of NCM622 positive electrode material, and then stir at 70°C Dry for 5h. The dried material was transferred to an argon atmosphere muffle furnace for heat treatment at 700°C for 5 hours, and after cooling, a lithium battery positive electrode material co-coated with nitrogen-doped graphene and lithium molybdate was obtained.

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Abstract

The invention is suitable for the technical field of lithium batteries, and provides a lithium battery cathode material with nitrogen-doped graphene and lithium molybdate and a preparation method of the lithium battery cathode material. The preparation method comprises the following steps: dispersing graphite oxide and a nitrogen source in water to form dispersion liquid, adding ascorbic acid, andheating to form gel; and adding a proper amount of molybdenum trioxide and a lithium ternary material in mixed gel, stirring and drying by distillation, calcining in an inert gas atmosphere, and cooling to obtain nitrogen-doped graphene and lithium molybdate co-coated lithium battery ternary cathode material. A nitrogen-doped graphene and lithium molybdate lithium-ion conductor co-coated layer isformed on the surface of the material by molybdenum trioxide and graphene gel, the electrochemical performance of the material can be improved by good conductive property of nitrogen-doped graphene,by use of the ascorbic acid, part of residual alkali is reduced favorably, the processing performance of the cathode material is improved, moreover, by the coated layer in a lithium salt mode, the diffusion path of lithium ions in an electrode material can be greatly expanded, the lithium ion conveying rate is increased, and therefore, the rate capability of the material is improved. The method issimple in process, and the electrochemical performance improving effect is remarkable.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium battery cathode material and a preparation method of nitrogen-doped graphene and lithium molybdate. Background technique [0002] Compared with other battery systems, lithium-ion batteries have the advantages of high energy density, good cycle performance and no memory effect. As an important energy storage device, lithium-ion batteries have been widely used in portable electronic devices, electric tools and electric vehicles, etc. field. With the rapid development of new energy vehicles, higher requirements are put forward for lithium-ion batteries that provide energy, especially the requirements for power performance and cycle performance are more stringent. The cathode material in lithium-ion batteries is a key factor affecting battery performance. The ideal cathode material for lithium-ion batteries should have high capacity, high rate, hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 徐世国周晓燕惠科石任正田张明龙李新章
Owner GEM WUXI ENERGY MATERIAL CO LTD
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