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Preparation method of high-magnification graphite negative electrode material for lithium ion power battery

A technology of graphite negative electrode and graphite tailing material, applied in battery electrodes, graphite, negative electrode and other directions, can solve the problems of increasing cost pressure of enterprises, small particle size of tailing material, large specific surface area, etc., achieving good isotropy, charging and discharging High rate, good charge and discharge performance

Pending Publication Date: 2021-06-25
贵州东岛新能源材料有限公司
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  • Abstract
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Problems solved by technology

These tailings cannot be used as lithium-ion anode materials due to their small particle size, low tap density, and large specific surface area. They can only be used as cheap metallurgical recarburizers or refractory materials, which leads to waste of resources and increases the cost pressure of enterprises.
How to make full use of these tailings to produce power battery anode materials has not yet attracted the attention of the industry

Method used

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  • Preparation method of high-magnification graphite negative electrode material for lithium ion power battery

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preparation example Construction

[0046] 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.

[0047] 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.

Embodiment 1

[0049] (1) Phenolic resin and petroleum coke tailings (D 50 3 μm) into the mixer according to the mass ratio of 16:100, adjust the rotation speed to 240r / min, and mix for 1.5 hours to obtain the first precursor.

[0050] (2) Compress the first precursor into powder and fill it into the rubber mold of the isostatic pressing molding machine. Through high-frequency electromagnetic vibration, the first precursor is compacted. After compaction, vacuumize and discharge the space between the first precursor particles. Put the air into a high-pressure container filled with water, pressurize to 120MPa, heat to 150°C, keep the pressure for 3h, cool to room temperature and press into a block.

[0051] (3) Break up and reshape the block in step (2) to obtain the second precursor (D 50 8μm, tap density 0.65g / cm 3 ).

[0052] (4) The second precursor and asphalt were mixed according to the mass ratio of 100:10, then placed in a fusion machine, fused and granulated at 700°C under nitrogen...

Embodiment 2

[0056] (1) Pitch and pitch coke tailings (D 50 1 μm) was added into the mixer according to the mass ratio of 18:100, the speed was adjusted to 250r / min, and mixed for 3.0 hours to obtain the first precursor.

[0057] (2) Compress the first precursor into powder and fill it into the rubber mold of the isostatic pressing molding machine. Through high-frequency electromagnetic vibration, the first precursor is compacted. After compaction, vacuumize and discharge the space between the first precursor particles. Put the air into a high-pressure container filled with water, pressurize to 130MPa, heat to 120°C, keep the pressure for 3h, cool to room temperature and press into a block.

[0058] (3) breaking up and shaping the agglomerates of step (2) to obtain the second precursor (D 50 6μm, tap density 0.56g / cm 3 ).

[0059] (4) The second precursor and asphalt were mixed according to the mass ratio of 100:15, then placed in a fusion machine, fused and granulated at 700°C under ni...

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Abstract

The invention provides a preparation method of a high-magnification graphite negative electrode material for a lithium ion power battery. According to the method, isostatic pressing molding is introduced so that graphite tailings are combined more tightly, the graphite tailings are subjected to primary granulation to increase the D50 of the graphite tailings to 6-10 microns, then shaping is performed to enable the tap density of the graphite tailings to be larger than or equal to 0.5 g / cm<3>, then through fusion granulation, the D50 of the graphite tailings is increased to 12-17 microns, and then shaping is performed to enable the tap density of the graphite tailings to be larger than or equal to 0.6 g / cm<3>. Compared with the existing negative electrode material, the graphite negative electrode material prepared by the method has the advantages of good isotropy, good cycle performance, high charge-discharge rate of graphite, and particularly good large-current charge-discharge performance, the maximum charge-discharge rate can reach 10C, the expansion generated by the electrode in the charge-discharge inhibition and absorption process is small, and the product property is stable.

Description

technical field [0001] The invention belongs to the technical field of carbon negative electrode materials for lithium ion batteries, and in particular relates to a preparation method of a high rate graphite negative electrode material for lithium ion power batteries. Background technique [0002] Lithium-ion batteries have become a new generation of secondary batteries after nickel-metal hydride batteries since the 1990s due to their high operating voltage, high energy density, long cycle life, small self-discharge, and no memory effect. [0003] In recent years, with the increasing requirements for miniaturization, light weight, multi-function, and long-term driving of electronic products, vehicle-mounted and energy storage equipment, the requirements for high energy density and high rate performance of lithium-ion batteries continue to increase. Existing research shows that the smaller the particle size of graphite, the better the isotropy, the shorter the distance betwee...

Claims

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Application Information

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IPC IPC(8): C01B32/205C01B32/21H01M4/587H01M10/0525
CPCC01B32/205C01B32/21H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 叶雨佐林毛刘玉玺吴其修
Owner 贵州东岛新能源材料有限公司
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