Graphite negative electrode material, preparation method thereof and battery

A graphite negative electrode and graphite technology, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve problems such as poor charge and discharge performance, poor cycle stability, and electrode sheet shedding, and achieve volume expansion and contraction inhibition and force enhancement. , to avoid the effect of capacity drop

Active Publication Date: 2021-05-11
EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a graphite negative electrode material, aiming at solving the serious volume expansion and shrinkage of the existing graphite negative electrode materials during the charge and discharge process of lithium ion batteries, easy to fall off from the pole piece, poor cycle stability, and poor charge and discharge performance, etc. technical problem

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  • Graphite negative electrode material, preparation method thereof and battery
  • Graphite negative electrode material, preparation method thereof and battery
  • Graphite negative electrode material, preparation method thereof and battery

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preparation example Construction

[0048] The embodiment of the present invention also provides a preparation method of a graphite negative electrode material, comprising the following steps:

[0049] S10. After dispersing graphite, carbon source and graphene in water, grind to obtain a grind product;

[0050] S20. Spray granulating the ground product to obtain a graphite negative electrode precursor;

[0051] S30. heat-treating the graphite negative electrode precursor in a protective gas atmosphere at a temperature of 500-1500° C. for 2-48 hours to obtain a graphite negative electrode material with a pomegranate-like structure.

[0052] The preparation method of the graphite negative electrode material provided by the embodiment of the present invention is to disperse graphite, carbon source and graphene in water and then grind the graphite to make the graphite micronano to obtain the ground product. Coating, and the intermolecular force of small-particle graphite is enhanced, and the aggregation of small-pa...

Embodiment 1

[0072] A graphite negative electrode material, comprising the following preparation steps:

[0073] According to the mass ratio of natural graphite, sucrose, sulfonated graphene and pure water as 100:20:1:100, the natural graphite, sucrose and sulfonated graphene were dispersed in pure water, and then ground in a sand mill to obtain an average The particle size D50 is a ground product of 10 μm. Among them, the average particle size D50 of natural graphite is 50 μm; the radial size of sulfonated graphene is 0.05 μm, the thickness is 0.5 nm, and the molar ratio of carbon element and sulfur element in sulfonated graphene is 5:1;

[0074] Under the conditions that the rotating speed of the atomizing disc is 15000rpm and the drying temperature is 250°C, the grinding product with a solid content of 30wt% is spray-granulated to obtain a graphite negative electrode precursor;

[0075] The graphite negative electrode precursor was sintered in a nitrogen atmosphere furnace at 1500° C. ...

Embodiment 2

[0077] A graphite negative electrode material, comprising the following preparation steps:

[0078] According to the mass ratio of natural graphite, glucose, sulfonated graphene and pure water as 10:1:1:100, natural graphite, sucrose and sulfonated graphene were dispersed in pure water, and then ground in a sand mill to obtain an average The ground product with a particle size D50 of 0.1 μm. Among them, the average particle size D50 of natural graphite is 5 μm; the radial size of sulfonated graphene is 100 μm, the thickness is 20 nm, and the molar ratio of carbon element and sulfur element in sulfonated graphene is 30:1;

[0079] Under the conditions that the rotating speed of the atomizing disc is 1800rpm and the drying temperature is 200°C, the grinding product with a solid content of 40wt% is spray-granulated to obtain a graphite negative electrode precursor;

[0080] The graphite negative electrode precursor was sintered in a nitrogen atmosphere furnace at 500° C. for 48 ...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a graphite negative electrode material which is of a pomegranate-like structure and comprises a graphene shell layer and a plurality of graphite monomer particles wrapped in the graphene shell layer, and each graphite monomer particle comprises a graphite particle and an amorphous carbon layer wrapping the outer surface of the graphite particle. According to the graphite negative electrode material, the graphite particles serve as the inner core, the outer surface of the inner core is coated with the amorphous carbon layer to form a graphite monomer particle, the multiple graphite monomer particles are coated with the graphene to form a whole, the whole is a secondary coated particle with the graphene as the shell layer, the whole is of a pomegranate-like structure, the ion transmission path is shortened, the rapid charging and discharging performance of the lithium ion battery is improved, and the cycling stability, the charging and discharging efficiency and the safety performance of the lithium ion battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a graphite negative electrode material and a preparation method thereof, and a lithium ion battery containing the graphite negative electrode material. Background technique [0002] Lithium-ion batteries have attracted more and more attention due to their high energy density, low self-discharge, good safety performance, long cycle life, and high operating voltage. At present, lithium-ion batteries have been widely used in electronic products such as mobile phones, notebook computers, digital cameras, etc., and have gradually replaced traditional batteries in the fields of aviation, navigation, aerospace and military communication equipment. In recent years, they have been widely used in electric The field of automotive technology. [0003] Lithium-ion batteries include positive electrodes, negative electrodes, separators and electrolytes. Among them, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/62H01M10/0525
CPCH01M4/628H01M4/587H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 高俊强赵文文张勍蒋永昶
Owner EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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