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A kind of high-capacity artificial graphite negative electrode material for lithium-ion power battery and preparation method thereof

A technology of artificial graphite negative electrode and power battery, which is applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problem of low capacity of artificial graphite, achieve high commercial value, increase added value, and realize the effect of rational utilization

Active Publication Date: 2022-05-27
GUANGDONG DONGDAO NEW ENERGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-capacity artificial graphite negative electrode material for lithium-ion power batteries and its preparation method and application, which are used to solve the problem of low capacity of artificial graphite in existing lithium-ion power batteries

Method used

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  • A kind of high-capacity artificial graphite negative electrode material for lithium-ion power battery and preparation method thereof

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[0039] The preparation method of the present invention will be described in further detail below with reference to specific examples. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies implemented based on the above content of the present invention are covered within the intended protection scope of the present invention.

[0040] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents, materials, etc. used in the following examples can be obtained from commercial sources unless otherwise specified.

[0041] The siliconizing agent used in the following examples is composed of 3-4wt% sodium fluoride, 10-12wt% silicon powder and 84-86wt% alumina.

[0042] The artificial graphite block used in the following examples comes from the leftover material...

Embodiment 1

[0044]The siliconizing agent: water: polyvinyl alcohol is mixed evenly in a weight ratio of 15:80:3 to prepare a siliconizing slurry, and the siliconizing slurry is coated on the surface of the artificial graphite block by a dip coating method, and then dried; The dried graphite block was placed in a high-temperature furnace, heated to 1000°C for 1 hour under a vacuum of -0.02MPa, taken out under air cooling to room temperature, cleaned with ultrasonic waves for 0.5 hours, and then blown dry with cold air. Then it is crushed, classified and shaped in an impact pulverizer to obtain the average particle size D. 50 It is 16μm artificial graphite powder. Mix pitch and artificial graphite micropowder at a weight ratio of 1:20, treat under the protection of inert gas at a temperature of 1000°C for 2 hours, cool to room temperature, and then disperse, sieve, and demagnetize to obtain a product.

Embodiment 2

[0046] The siliconizing agent: water: starch is mixed evenly in a weight ratio of 18:85:3 to prepare a siliconizing slurry, and the siliconizing slurry is coated on the surface of the artificial graphite block by spraying, and then dried; The graphite block was placed in a high-temperature furnace, heated to 1100°C under a vacuum of -0.06MPa for 0.5 hours, air-cooled to room temperature, taken out, cleaned with ultrasonic waves for 1 hour, and dried with cold air. Then, it is crushed, classified and shaped in an airflow vortex mill to obtain an average particle size D. 50 It is 18μm artificial graphite powder. Mix pitch and artificial graphite micropowder at a weight ratio of 1:30, treat at 800°C for 2 hours under the protection of inert gas, cool to room temperature, disperse, sieve and demagnetize to obtain the product.

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Abstract

The invention provides a high-capacity artificial graphite negative electrode material for lithium-ion power batteries and a preparation method thereof. The method uses a vacuum environment of 950-1150° C. to diffuse nano-Si into the nano-pores of the artificial graphite block, so that the Si Evenly distributed in artificial graphite, the artificial graphite negative electrode material prepared by the method also retains the overall structural characteristics of artificial graphite, and Si is filled inside the nanopores of artificial graphite. Compared with the existing artificial graphite negative electrode material, the electric Good chemical properties, discharge capacity ≥ 380mAh / g, first coulombic efficiency > 93%, cycle life has been significantly improved, and the capacity retention rate of 2000 cycles at 0.2C rate is ≥ 80%. In addition, the invention greatly increases the added value of special graphite tailings, realizes rational utilization of resources, and has great commercial value.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a high-capacity artificial graphite negative electrode material for lithium-ion power batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have a series of advantages such as high specific capacity, high operating voltage, good safety, and no memory effect, and are widely used in notebook computers, mobile phones, and instrumentation lamps and many other portable electronic equipment. With the popularization of new energy vehicles, its application scope has expanded to electric vehicles and other fields. In recent years, with the increasing requirements for miniaturization, light weight, multi-function, and long-term driving of electronic products and automotive and energy storage equipment, the requirements for high energy density, high rate performance and long cycle life of lithium-ion batteries are increasing. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587H01M10/0525
CPCH01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 吴其修
Owner GUANGDONG DONGDAO NEW ENERGY
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