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High-capacity fast-charging type microcrystal graphite negative electrode material and preparation method thereof

A technology of anode material and microcrystalline graphite, which is applied in the field of high-capacity fast-charge lithium-ion battery anode materials and its preparation, can solve the problem that the capacity is difficult to meet electric vehicles, etc., and achieve a significant increase in capacity and good catalytic uniformity.

Active Publication Date: 2019-11-05
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no problem with the power performance of microcrystalline graphite materials used in this field, but its capacity is difficult to meet the needs of electric vehicles

Method used

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  • High-capacity fast-charging type microcrystal graphite negative electrode material and preparation method thereof
  • High-capacity fast-charging type microcrystal graphite negative electrode material and preparation method thereof
  • High-capacity fast-charging type microcrystal graphite negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Mix 3 μm elemental silicon and polypropylene evenly at a mass ratio of 1:0.5, heat to 150°C while stirring under a nitrogen atmosphere, stir for 3 hours, and cool the catalyst / pore-forming agent composite.

[0038] (2) Mix 8 μm microcrystalline graphite with catalyst / pore-forming agent compound and petroleum pitch according to the ratio of 10:1:0.8 to form a mixture.

[0039] (3) Isostatic pressing: the mixture is placed in a rubber mold, subjected to isostatic pressing at a pressure of 200 MPa, and kept for 1.5 hours to obtain an isostatic pressed block.

[0040] (4) Carbonization: Under a nitrogen atmosphere, the isostatically pressed block was heated to 750°C at a heating rate of 1°C / min, and a carbon block containing micron-sized pores was obtained after natural cooling.

[0041] (5) Catalytic graphitization: Put the carbon block containing micron-sized pores into a conventional Acheson furnace for catalytic graphitization to obtain a graphitized block.

[0042...

Embodiment 2

[0044] (1) Mix 3 μm elemental silicon and polyethylene evenly at a mass ratio of 1:1, heat to 120°C while stirring under a nitrogen atmosphere, stir for 2 hours, and cool the catalyst / pore-forming agent composite.

[0045] (2) Mix 8 μm microcrystalline graphite with catalyst / pore-forming agent compound and petroleum pitch according to the ratio of 10:0.7:1.1.

[0046] (3) Isostatic pressing: put the mixture in a rubber mold, and perform isostatic pressing under a pressure of 250 MPa, and hold the pressure for 3 hours.

[0047] (4) Carbonization: Under a nitrogen atmosphere, the isostatically pressed block material was heated to 800°C at a heating rate of 0.5°C / min, and a carbon block containing micron-sized pores was obtained after natural cooling.

[0048] (5) Catalytic graphitization: Catalytic graphitization is carried out in a conventional Acheson furnace, and the maximum temperature of graphitization is 3000-3400°C.

[0049] (6) Finally, the graphitized block material wa...

Embodiment 3

[0051] (1) Mix 5 μm silicon carbide and polystyrene evenly at a mass ratio of 1:0.5, heat to 150°C while stirring under a nitrogen atmosphere, stir for 3 hours, and cool the catalyst / pore-forming agent composite.

[0052] (2) Mix 8 μm microcrystalline graphite with catalyst / pore former compound and petroleum pitch according to the ratio of 10:1:0.8.

[0053] (3) Isostatic pressing: place the mixture in a rubber mold, and treat it under isostatic pressure at 200 MPa, and hold the pressure for 1.5 hours.

[0054] (4) Carbonization: Under an argon atmosphere, the isostatically pressed block was heated to 750°C at a heating rate of 1°C / min, and a carbon block containing micron-sized pores was obtained after natural cooling.

[0055] (5) Catalytic graphitization: Catalytic graphitization is carried out in a conventional Acheson furnace.

[0056] (6) Finally, the graphitized block material was crushed, shaped, classified, demagnetized, and sieved to obtain the 3# sample.

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Abstract

The invention discloses a preparation method of a high-capacity fast-charging type lithium ion battery negative electrode material. The preparation method comprises the following steps of mixing a silicon-based catalyst with a pore-forming agent to prepare a catalyst / pore-forming agent compound, and then mixing microcrystalline graphite with the catalyst / pore-forming agent compound and a binder uniformly, and next, carrying out isostatic pressing treatment to obtain isostatic pressing blocks; carbonizing the isostatic pressing blocks to obtain carbon blocks containing micron-scale pores; and carrying out catalytic graphitization on the carbon blocks containing the micron-scale pores, and then performing crushing, shaping, grading, degaussing and screening to obtain the high-capacity fast-charging type lithium ion battery negative electrode material. According to the method, the graphitization degree of the microcrystalline graphite is improved to 96% or above, and the reversible capacity is improved to 360 mAh / g or above, and the charging capacity ratio at 6C / 1C is higher than 65%.

Description

technical field [0001] The invention relates to a lithium-ion battery negative electrode material, in particular to a high-capacity fast-charging lithium-ion battery negative electrode material and a preparation method thereof. Background technique [0002] Microcrystalline graphite, also known as earthy graphite, is an important natural mineral resource. There are abundant microcrystalline graphite mines in Hunan, Jilin, Inner Mongolia and other places in my country. However, because we have not paid enough attention to the in-depth development of microcrystalline graphite for a long time, the current microcrystalline graphite industry mainly sells ore, resulting in serious waste of resources. [0003] At present, lithium-ion batteries have occupied a dominant position in the field of electric vehicles, and the market demand is increasing rapidly year by year. If microcrystalline graphite is used as a negative electrode material for lithium-ion batteries, the excellent kine...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/587H01M10/0525C01B32/205
CPCC01B32/205H01M4/1393H01M4/587H01M10/0525Y02E60/10
Inventor 石磊邵浩明王志勇皮涛黄越华余梦泽
Owner HUNAN SHINZOOM TECH
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