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Composite negative electrode material and preparation method therefor and lithium ion battery

A negative electrode material, carbonaceous material technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor high-current charge and discharge performance, poor electrolyte compatibility, poor battery cycle stability, etc., to achieve absorption The performance of the liquid is improved, which is conducive to fast charging and the effect of improving the performance of the charge and discharge rate.

Active Publication Date: 2018-02-16
贝特瑞(四川)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But from another point of view, graphite-based negative electrode materials have an upper limit of capacity, which is difficult to break through; poor compatibility with the electrolyte, resulting in poor battery cycle stability; and poor high-current charge and discharge performance, and the rate performance remains to be seen. promote

Method used

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  • Composite negative electrode material and preparation method therefor and lithium ion battery
  • Composite negative electrode material and preparation method therefor and lithium ion battery
  • Composite negative electrode material and preparation method therefor and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] (1) Put the small particle precursor (petroleum coke, 7.5% volatile content, 0.45% ash content, average particle size D501.5μm) into a V-type mixer and mix for 10 minutes to obtain a uniformly mixed small particle precursor;

[0112] Heat the binder (coal tar pitch, softening point ~ 50°C) to 60°C to obtain a molten binder;

[0113] Add the homogeneously mixed small-particle precursor and the molten binder into the kneading equipment at the same time, and knead at 50°C for 2 hours to obtain a kneaded material;

[0114] Wherein, based on the total mass of the small particle precursor and the binder in the molten state as 100%, the mass percentage of the binder in the molten state is 5%;

[0115] (2) Put the kneaded material into an Acheson graphitization furnace, carry out graphitization treatment at 2700°C under an argon atmosphere, and then carry out crushing and particle shaping in a turbo mill, so that the average particle size D50 is 11.05 μm, The sphericity S50 is...

Embodiment 2

[0126] (1) Add the small particle precursor (a mixture of petroleum coke and coal coke, volatile matter 10.2%, ash content 0.45%, average particle size D50 2.8 μm) into the tank mixer and mix for 30 minutes to obtain a uniformly mixed small particle precursor ;

[0127] Heat the binder (petroleum asphalt, softening point ~ 250°C) to 300°C to obtain a molten binder;

[0128] Add the homogeneously mixed small particle precursor and the molten state binder into the kneading equipment at the same time, and knead at 280 ° C for 1 hour to obtain the kneaded material;

[0129] Wherein, based on the total mass of the small particle precursor and the binder in the molten state as 100%, the mass percentage of the binder in the molten state is 10%;

[0130] (2) Put the kneaded material into an inner series graphitization furnace, carry out graphitization treatment at 2800° C. under a nitrogen atmosphere, and then carry out pulverization and particle shaping in an airflow vortex micro-po...

Embodiment 3

[0136] (1) Put the small particle precursor (petroleum pitch-based spherical non-graphitized product, 12.6% volatile matter, 0.30% ash content, average particle size D50 9.8 μm) into the drum mixer and mix for 60 minutes to obtain a uniformly mixed small particle precursor ;

[0137] Heat the binder (resin) to 100°C to obtain a molten binder;

[0138] Add the homogeneously mixed small-particle precursor and the molten binder into the kneading equipment at the same time, and knead at 100°C for 5 hours to obtain a kneaded material;

[0139] Wherein, based on the total mass of the small particle precursor and the binder in the molten state as 100%, the mass percentage of the binder in the molten state is 20%;

[0140] (2) Put the kneaded material into the Acheson graphitization furnace, carry out graphitization treatment at 3000°C under vacuum conditions, and then carry out crushing and particle shaping in the super cyclone vortex mill, so that the average particle size D50 is 1...

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Abstract

The invention relates to a composite negative electrode material and a preparation method therefor and a lithium ion battery. The composite negative electrode material comprises a carbonaceous material with an embedding structure and formed by embedding first carbon component small particles into a second carbon component framework carrier, wherein the first carbon component is converted by a small particle precursor (green coke and / or burning coke and / or carbon microspheres); and the second carbon component framework carrier is converted by a binder. The composite negative electrode materialdisclosed in the invention combines the "embedding type" structure and a "gradient type crystal form" structure; the small particles of different appearances are embedded in the relatively thick framework carrier to form a bigger particle; the small particles embedded in the interior adopt a graphite structure with the best crystal form; the framework carrier adopts a graphite structure with the ordinary crystal form; and the outermost layer also can be coated with an amorphous carbon structure with the worst crystal form. The composite negative electrode material provided by the invention hasstructural stability, high orientation, low expansion, high rate capability, excellent liquid absorption performance and cycle performance, and can satisfy various kinds of demands in the application.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and relates to a composite negative electrode material, a preparation method thereof and a lithium ion battery, in particular to a composite negative electrode material, a preparation method thereof, and a negative electrode material prepared by using the composite negative electrode material and a lithium ion battery. Battery. Background technique [0002] As a mature electrochemical power system, lithium-ion batteries have been used in various aspects of people's daily life, but their performance is still difficult to meet the various needs of the application. At present, the most widely used and best-performing lithium-ion battery anode materials are graphite materials, which have good layered structure, stable discharge platform, small volume change and no voltage hysteresis in the process of lithium intercalation and deintercalation. But from a...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 李子坤赵勃黄友元岳敏
Owner 贝特瑞(四川)新材料科技有限公司
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