A kind of preparation method of natural graphite-based composite electrode material

A natural graphite and composite electrode technology, applied in graphite, battery electrodes, circuits, etc., can solve the problems of poor charge-discharge reversibility and cycle performance, low chemical reactivity, complex preparation process, etc., and achieve good reversibility of charge-discharge reaction, Excellent cycle performance and simple process

Active Publication Date: 2017-05-10
HUBEI ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of high preparation temperature, poor reversibility and cycleability of charge and discharge, low chemical reactivity and complicated preparation process commonly found in graphite negative electrode materials prepared by existing methods, and provide a new lithium ion A method for preparing natural graphite-based composite negative electrode materials for batteries. The obtained negative electrode materials have many advantages such as low preparation temperature, good charge and discharge reaction reversibility, excellent cycle performance, high chemical reaction activity, high product cost performance, and simple preparation process conditions.

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  • A kind of preparation method of natural graphite-based composite electrode material
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  • A kind of preparation method of natural graphite-based composite electrode material

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Embodiment 1

[0027] A preparation method of natural graphite-based composite electrode material, the steps are as follows:

[0028] Mechanically process the natural flake graphite to the average particle size D 50 =17μm, then in a smaller argon gas atmosphere (air flow rate of 3cm 3 / min) from room temperature to 200°C at a heating rate of 5°C / min and kept for 1 hour, and activated natural graphite was obtained after cooling. The melamine was then placed in a muffle furnace and raised from room temperature to 520° C. at a rate of 5° C. / min in an air atmosphere, and kept there for 2 hours. After cooling, a light yellow powder was obtained. Then, the activated natural graphite and the light yellow powder were mixed in a V-type mixer at a mass ratio of 95wt%:5wt% for 2 hours, and the rotating speed was set at 100 rpm. Gained mixed product is in argon atmosphere (argon flow velocity is 40cm 3 / min) from room temperature to 700°C at a rate of 5°C / min and kept at 700°C for 6 hours, after cool...

Embodiment 2

[0030] A preparation method of natural graphite-based composite electrode material, the steps are as follows:

[0031] Mechanically process the natural flake graphite to the average particle size D 50 =17μm, then in a smaller argon gas atmosphere (air flow rate of 3cm 3 / min) from room temperature to 200°C at a heating rate of 5°C / min and kept for 1 hour, and activated natural graphite was obtained after cooling. The melamine was then placed in a muffle furnace and raised from room temperature to 520° C. at a rate of 5° C. / min in an air atmosphere, and kept there for 2 hours. After cooling, a light yellow powder was obtained. Then, the activated natural graphite and the light yellow powder were mixed in a V-type mixer at a mass ratio of 90wt%: 10wt% for 2 hours, and the rotating speed was set at 150 rpm. Gained mixed product is in nitrogen atmosphere (nitrogen gas flow velocity is 40cm 3 / min) from room temperature to 700°C at a rate of 5°C / min and kept at 700°C for 6 hours...

Embodiment 3

[0033]A preparation method of natural graphite-based composite electrode material, the steps are as follows:

[0034] Mechanically process the natural flake graphite to the average particle size D 50 =17μm, then in a smaller argon gas atmosphere (air flow rate of 3cm 3 / min) from room temperature to 200°C at a heating rate of 5°C / min and kept for 1 hour, and activated natural graphite was obtained after cooling. The melamine was then placed in a muffle furnace and raised from room temperature to 520° C. at a rate of 5° C. / min in an air atmosphere, and kept there for 2 hours. After cooling, a light yellow powder was obtained. Then, the activated natural graphite and the light yellow powder were mixed in a V-type mixer at a mass ratio of 85wt%: 15wt% for 2 hours, and the rotating speed was set at 100 rpm. Gained mixed product is in argon atmosphere (argon flow velocity is 40cm 3 / min) from room temperature to 800°C at a rate of 5°C / min and maintained at 800°C for 6 hours, aft...

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Abstract

The invention belongs to the technical field of preparation of lithium ion battery electrode materials and particularly discloses a preparation method of a natural graphite-based composite electrode material. The method includes the steps of firstly mixing micro-oxidized natural graphite with a stage product of carbon thermolysis of melamine according to a certain mass ratio, and directly performing thermal-treatment, and finally performing ball-milling and sieving to obtain the high-performance natural graphite-based composite electrode material. The invention provides the preparation method of the novel natural graphite-based composite anode material of a lithium ion battery. The anode material is low in preparation temperature, is good in reversibility of charging-discharging reaction, is excellent in cycle performance, is high in chemical reaction activity, is high in performance-cost ratio and is simple in process conditions of preparation.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery electrode materials, in particular to a preparation method of a natural graphite-based composite electrode material. Background technique [0002] With the rapid development of electric vehicles and other electronic devices, the demand for lithium-ion batteries with high specific energy, high cycle stability, and long service life has increased exponentially. Most of the current commercial lithium-ion battery anode materials use various lithium-intercalated carbon materials, especially natural graphite-based composite anode materials, but the layered structure of natural graphite has poor compatibility with the electrolyte, and the lithium-ion The de-intercalation of graphite layers will gradually peel off to form new surfaces, increasing the irreversible capacity loss, resulting in the disadvantages of natural graphite electrode materials such as low specific capacity, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587C01B32/21
CPCY02E60/10
Inventor 丁瑜王锋杜军肖迎波覃彩芹
Owner HUBEI ENG UNIV
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