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Composite graphite anode material for lithium-ion battery and preparation method of composite graphite cathode material

A lithium-ion battery and composite graphite technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of small specific surface area, easy to cause pollution, and increased specific surface area of ​​materials, and achieve simple processing procedures and low synthesis costs. Effect

Active Publication Date: 2017-09-29
KEDA (ANHUI) NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN1304187A and Chinese patent CN1224251A are coated with resinous polymer pyrolytic carbon, which can prevent co-intercalation of solvent molecules, reduce the structural change of graphite during charging and discharging, and improve the cycle performance of materials. However, this coating method After coating, the specific surface area of ​​the material increases, which increases the irreversible capacity and reduces the first Coulombic efficiency; Chinese patents CN96198348.5 and CN03120199.6 use asphalt for coating, and found that the negative electrode material coated with asphalt pyrolysis carbon Small specific surface area, good affinity with graphite, and more stable structure, but the asphalt will be deformed due to melting during the coating process, and if the amount is too much, it will lead to too little agglomeration and uneven coating; Chinese patent CN101162775A combines asphalt and resin Dissolve at the same time, then add graphite to mix, heat treatment after solvent evaporation, the formed pyrolytic carbon is coated on the graphite surface to improve the cycle performance and rate performance of graphite, but this method needs to use organic solvents, which is easy to cause pollution

Method used

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  • Composite graphite anode material for lithium-ion battery and preparation method of composite graphite cathode material
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Embodiment 1

[0026] A composite graphite negative electrode material for a lithium ion battery, comprising an inner core and a shell, the inner core is artificial graphite formed after coke graphitization and uncoated natural graphite, and the shell is the volatile matter in the coke during the graphitization process Formed carbon layer, the preparation steps of the lithium electronic battery composite graphite negative electrode material are as follows:

[0027] 1) Take the needle coke and petroleum coke according to the mass ratio of 0.68:1, and then crush, shape and classify them respectively; <0.3%, sulfur content <0.5%, the average particle size D50 of the needle coke and petroleum coke is 10-40 μm;

[0028] 2) Mixing classified needle coke, petroleum coke and uncoated spherical natural graphite to obtain a mixture; wherein, the added weight of spherical natural graphite is 2.5% of the total amount of needle coke and petroleum coke;

[0029] 3) Send the mixture into the Acheson graph...

Embodiment 2

[0032] A composite graphite negative electrode material for a lithium ion battery, comprising an inner core and a shell, the inner core is artificial graphite formed by graphitization of coke and uncoated natural graphite, and the shell is formed by volatile matter in the process of graphitization of coke Carbon layer, the preparation steps of the lithium electronic battery composite graphite negative electrode material are as follows:

[0033] 1) Take the needle coke and petroleum coke according to the mass ratio of 0.90:1, and then crush, shape and classify them respectively; <0.3%, sulfur content <0.5%, the average particle size D50 of the needle coke and petroleum coke is 10-40 μm;

[0034] 2) Mixing classified needle coke, petroleum coke and uncoated spherical natural graphite to obtain a mixture; wherein, the added weight of spherical natural graphite is 3.5% of the total amount of needle coke and petroleum coke;

[0035] 3) Send the mixture into the Acheson graphitizat...

Embodiment 3

[0038] A composite graphite negative electrode material for a lithium ion battery, comprising an inner core and a shell, the inner core is artificial graphite formed after coke graphitization and uncoated natural graphite, and the shell is formed by volatile matter in the coke graphitization process The carbon layer, the preparation steps of the lithium electronic battery composite graphite negative electrode material are as follows:

[0039] 1) Take the needle coke and petroleum coke according to the mass ratio of 0.3:1, and then crush, shape and classify them respectively; 0.3%, sulfur content <0.5%, the average particle size D50 of the needle coke and petroleum coke is 10-40 μm;

[0040] 2) mixing classified needle coke, petroleum coke and uncoated spherical natural graphite to obtain a mixture; wherein, the added weight of spherical natural graphite is 1% of the total amount of needle coke and petroleum coke;

[0041] 3) Send the mixture into the Acheson graphitization fu...

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Abstract

The invention provides a composite graphite anode material for a lithium-ion battery and a preparation method of the composite graphite anode material. The composite graphite anode material for the lithium-ion battery comprises a core and a shell, wherein the core is artificial graphite formed after coke graphitization and uncoated natural graphite; and the shell is a carbon layer formed by volatile matters in the coke graphitization process. The method comprises the preparation steps of crushing, shaping and grading, mixing, graphitizing and sieving. An organic solvent does not need to be used, and surface coating of graphite is achieved in the graphitizing process, so that the composite graphite andoe material is simple in treatment technology, safe, environment-friendly and low in synthesis cost, and the prepared composite anode material has excellent overall performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrode materials and preparation thereof, in particular to a lithium-ion battery composite graphite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are seen as an energy option in the sustainable transportation industry. In hybrid vehicles, the synergistic combination of internal combustion engine and electrochemical battery provides high fuel utilization, which is beneficial to fuel economy and pollution emission control. Today, the production of battery-powered hybrid vehicles moves very quickly from demonstration models to more successful commercial products. As the latest generation of clean chemical energy, lithium-ion batteries are unique in the field of batteries because of their long service life, small size, and high specific energy. Artificial graphite is a kind of negative electrode material for lithium i...

Claims

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Application Information

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IPC IPC(8): H01M4/583
CPCH01M4/583Y02E60/10
Inventor 付健刘双双朱亚锋周浩梅海龙
Owner KEDA (ANHUI) NEW MATERIAL CO LTD
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