Preparation method of artificial graphite material special for lithium ion battery negative electrode

A lithium-ion battery, artificial graphite technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as high price, inability to achieve high capacity and high rate performance, and complex negative electrode production processes.

Active Publication Date: 2020-10-27
鞍钢化学科技有限公司
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Problems solved by technology

[0005] The invention provides a preparation method of artificial graphite material specially used for lithium-ion battery negative electrode, which is used to prepare a new type of artificial graphite-type negative electrode material with high capacity and high rate, which not only b

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  • Preparation method of artificial graphite material special for lithium ion battery negative electrode
  • Preparation method of artificial graphite material special for lithium ion battery negative electrode
  • Preparation method of artificial graphite material special for lithium ion battery negative electrode

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preparation example Construction

[0050] Such as figure 1 Shown, the preparation method of a kind of lithium-ion battery negative electrode special-purpose artificial graphite material of the present invention, comprises the steps:

[0051] Step 1, according to the reactivity of the high-reactivity components contained in the raw pitch, by controlling the thermal reaction conditions, the raw pitch undergoes a thermal polymerization reaction in an inert atmosphere to form microcrystalline units to obtain polymerized pitch; the thermal polymerization The reaction temperature is 350-400°C, the constant temperature time is 0.5-8h, and the heating rate is 0.5-5°C / min;

[0052] Step 2: Mix the polymerized asphalt obtained in Step 1 with the first solvent according to the set solvent-oil ratio, and then carry out static sedimentation separation after full stirring, and separate according to the set ratio to obtain light phase oil and heavy phase oil, and light phase oil As a by-product asphalt oil to be treated; the...

Embodiment 1

[0077] In this embodiment, the raw pitch is coal-based soft pitch with a softening point of 30°C, and its quinoline insoluble matter content is 1.83%. The heating rate was raised from room temperature to 400°C at a rate of min, and the temperature was kept at a constant temperature for 4 hours to form microcrystalline units and obtain polymerized pitch.

[0078]Mix the polymerized asphalt and wash oil at a mass ratio of 3:1, stir well at a temperature of 120°C, and then pour it into a static settling device with a length-to-diameter ratio of 8:1 for settling and separation. The settling temperature is 130°C, and the settling time is 3h, then separate the light phase oil and heavy phase oil according to the mass ratio of 8:2, and measure the density of the light phase oil to be 1.0g / cm 3 , the heavy phase oil density is 1.3g / cm 3 . Mix according to heavy phase oil:washing oil mass ratio of 1:3, heat to 70°C, fully stir for 2h, centrifugal speed 800rad / min, separation solid ph...

Embodiment 2

[0083] In this embodiment, the raw pitch is coal-based soft pitch with a softening point of 70°C, and its quinoline insoluble matter content is 3.85%. Raise the temperature from room temperature to 390°C at a rate of min, and stay at constant temperature for 5 hours to form microcrystalline units and obtain polymerized pitch.

[0084] Mix the polymerized asphalt and dianthracene oil at a mass ratio of 2:1, stir well at 150°C, and then pour it into a static settling device with a length-to-diameter ratio of 9:1 for settling and separation. The settling temperature is 140°C and the settling time is for 3 hours, then separate the light phase oil and heavy phase oil according to the mass ratio of 7:3, and measure the density of the light phase oil to be 0.9g / cm 3 , the heavy phase oil density is 1.2g / cm 3 . Mix heavy phase oil: dianthracene oil at a mass ratio of 1:4, heat to 80°C, stir thoroughly for 2 hours, centrifuge at 1000rad / min, and separate solid phase density at 1.1g / c...

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Abstract

The invention relates to a preparation method of an artificial graphite material special for a lithium ion battery negative electrode. The preparation method comprises the following steps of: preparing polymerized asphalt from raw material asphalt through thermal polymerization reaction; mixing and separating the polymerized asphalt and a solvent I to obtain light-phase oil and heavy-phase oil; blending the heavy-phase oil with the solvent I, and carrying out thermal separation treatment to obtain a soluble component and an insoluble component; mixing the insoluble component with a solvent II,carrying out filter pressing to obtain a filter cake and a filtrate, mixing the filtrate with the soluble component, and performing distilling to recover the solvent I and the solvent II to obtain rectified asphalt; and performing directional coking reaction on the rectified asphalt to obtain wide-area mesophase green coke, and performing calcination and high-temperature graphitization treatmenton the crushed green coke particles to obtain the artificial graphite material special for the lithium ion battery negative electrode. The technical difficulty that high capacity and high rate capability of the lithium ion battery negative electrode material cannot be achieved at the same time is broken through, and meanwhile the problems that a traditional lithium ion battery negative electrode is complex in production process and high in price are solved.

Description

technical field [0001] The invention relates to the technical field of high-efficiency utilization of coal tar pitch, in particular to a preparation method of an artificial graphite material specially used for negative electrodes of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, wide operating temperature range, long charge and discharge life, low self-discharge rate, no memory effect, and little environmental pollution. With many advantages such as safety and stability, fast charging and discharging, and no pollution, it has quickly become the mainstream power supply for small energy storage devices such as mobile phones and notebook computers. In addition, since the beginning of the new century, with the concept of low-carbon economy and life deeply rooted in the hearts of the people, electric vehicles have ushered in a good opportunity for further development. The United States, Japan a...

Claims

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Application Information

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IPC IPC(8): C01B32/205H01M4/587H01M10/0525
CPCC01B32/205H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 刘海丰何莹张大奎穆春丰
Owner 鞍钢化学科技有限公司
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