Modified microcrystal graphite cathode material of lithium ion battery as well as preparation method and application thereof

A technology of negative electrode material and microcrystalline graphite, applied in the field of modified microcrystalline graphite negative electrode material for lithium ion battery and its preparation field, can solve the problems of low initial charge and discharge efficiency, short cycle life and the like, and achieve high rate charge and discharge performance. , improved cycle life, good isotropic effect

Active Publication Date: 2018-03-20
GUANGDONG DONGDAO NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1063958A and CN105977487A adopt crushing, pitch coating, carbonization, and graphitization to prepare modified microcrystalline graphite negative electrode materials, and use high-temperature graphitization to remove impurities inside natural microcrystalline graphite. When impurities are removed, they will remain in microcrystalline graphite. A large number of micropores will lead to defects such as low initial charge and discharge efficiency and short cycle life

Method used

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  • Modified microcrystal graphite cathode material of lithium ion battery as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Coarsely pulverize microcrystalline graphite with a carbon content of 85% to 100 mesh, and then use H at 95°C 2 SO 4 :HF:HCl (1:2:1.5) mixed acid aqueous solution purification, microcrystalline graphite purity increased to 99.0%;

[0052] (2) The material in step (1) is first crushed with a low-speed impact ball mill, then shaped with a jet mill, and finally classified by air flow to obtain D 50 8μm material;

[0053] (3) Pack the material obtained in step (2) into a flexible packaging bag and seal it, put the packaging bag into a dipping tank, vacuumize, and heat the dipping tank to make its vacuum degree reach 0.07MPa and the temperature reach 300°C.

[0054] (4) inject the pitch in the melting tank (350° C.) into the impregnation tank of step (3) at 30 MPa, and when the pitch liquid exceeds the height of the packaging bag in the dip tank, stop vacuuming and keep warm for 1 hour at 40 MPa;

[0055] (5) After the step (4) heat preservation is completed, the asph...

Embodiment 2

[0059] (1) Coarsely pulverize microcrystalline graphite with a carbon content of 90% to 100 mesh, and then use H at 90°C 2 SO 4 :HF:HCl (1:1.5:1) mixed acid aqueous solution purification, microcrystalline graphite purity increased to 99.2%;

[0060] (2) The material in step (1) is first pulverized with an air flow vortex micro-powder machine, then shaped with a high-pressure mill, and finally a jet classifier is used to obtain D 50 12μm material;

[0061] (3) Pack the material obtained in step (2) into a soft packaging bag and seal it, put the packaging bag into a dipping tank, vacuumize, and heat the dipping tank so that its vacuum reaches 0.08MPa and the temperature reaches 300°C.

[0062] (4) inject the asphalt in the melting tank (300 DEG C) into the impregnation tank of step (3) at 50MPa, and when the asphalt liquid exceeds the height of the packaging bag in the impregnation tank, stop vacuuming and keep warm for 2 hours at 50MPa;

[0063] (5) After the step (4) heat p...

Embodiment 3

[0067] (1) Coarsely pulverize microcrystalline graphite with 80% carbon content to 100 mesh, and then use H at 95°C 2 SO 4 :HF:HCl (1:2.5:2) mixed acid aqueous solution purification, microcrystalline graphite purity increased to 99.4%;

[0068] (2) the material of step (1) is first pulverized with an ultrafine pulverizer, then with a rod mechanical pulverizer, and finally adopts an ultramicron airflow classifier to obtain D 50 16μm material;

[0069] (3) Pack the material obtained in step (2) into a soft packaging bag and seal it, put the packaging bag into a dipping tank, vacuumize, and heat the dipping tank so that its vacuum degree reaches 0.09MPa and the temperature reaches 330°C.

[0070] (4) inject the pitch in the melting tank (330° C.) into the impregnation tank of step (3) at 50 MPa, and when the pitch liquid exceeds the height of the packaging bag in the dip tank, stop vacuuming and keep warm for 3 hours at 50 MPa;

[0071] (5) After step (4) heat preservation is ...

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Abstract

The invention relates to the technical field of lithium ion battery carbon cathode materials and in particular to a modified microcrystal graphite cathode material of a lithium ion battery as well asa preparation method and application thereof. The material has the advantages that (1) a modified core-shell structured natural graphite cathode material with artificial graphite embedded into and onthe surface of natural graphite in situ is prepared, the overall structural properties of natural microcrystal graphite are maintained, pores of the natural microcrystal graphite is filled with the artificial graphite, and the outer surface of the natural microcrystal graphite is wrapped by the artificial graphite; (2) compared with a conventional cathode material, the cathode material prepared byusing the method provided by the invention is good in isotropy, is capable of inhibiting and absorbing expansion of electrodes in the charge and discharge process, is high in primary coulombic efficiency, long in service life and good in high-magnification charge and discharge performance and is capable of replacing artificial graphite to manufacture cathode materials of power batteries, so as tolower the cost greatly; and (3) the method is simple in preparation process, low in cost and relatively high in practicability.

Description

technical field [0001] The invention relates to the technical field of carbon negative electrode materials for lithium ion batteries, in particular to a modified microcrystalline graphite negative electrode material for lithium ion batteries and its preparation method and application. Background technique [0002] Lithium-ion batteries have a series of advantages such as high specific capacity, high working voltage, good safety, and no memory effect, and are widely used in 3C products, power devices, and energy storage equipment. With the popularity of new energy vehicles, its application scope has been expanded to electric vehicles, automobiles and other fields. In recent years, with the continuous improvement of electronic products, vehicle-mounted and energy storage equipment for miniaturization, light weight, multi-function, and long-term driving, the requirements for high energy density, high rate performance, and long cycle life of lithium-ion batteries constantly imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/21H01M4/587H01M10/0525
CPCH01M4/587H01M10/0525H01M2220/20Y02E60/10
Inventor 吴其修叶振坤叶雨佐史有利
Owner GUANGDONG DONGDAO NEW ENERGY
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