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 u

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

Example Embodiment

[0036] Example 1

[0037] (1) Mix 3μm elemental silicon and polypropylene uniformly in a mass ratio of 1:0.5, heat to 150°C while stirring under a nitrogen atmosphere, stir for 3h, and cool the catalyst / pore former composite.

[0038] (2) Mix 8 μm microcrystalline graphite, catalyst / pore former composite, and petroleum pitch evenly according to 10:1:0.8 to form a mixture.

[0039] (3) Isostatic pressing: The mixture is placed in a rubber mold and processed by isostatic pressing under a pressure of 200MPa for 1.5h to obtain an isostatically pressed block.

[0040] (4) Carbonization: In a nitrogen atmosphere, the isostatic compacted material is heated to 750°C at a heating rate of 1°C / min, and cooled naturally to obtain a carbon block containing micron-sized pores.

[0041] (5) Catalytic graphitization: A carbon block containing micron-sized pores is placed in a conventional Acheson furnace for catalytic graphitization to obtain a graphitized block.

[0042] (6) Finally, the graphitized bl...

Example Embodiment

[0043] Example 2

[0044] (1) Mix 3μm elemental silicon and polyethylene uniformly according to the mass ratio of 1:1, heat to 120°C while stirring under a nitrogen atmosphere, stir for 2h, and cool the catalyst / pore former composite.

[0045] (2) Mix 8 μm microcrystalline graphite, catalyst / porogen composite, and petroleum pitch according to 10:0.7:1.1.

[0046] (3) Isostatic pressing: Place the mixture in a rubber mold and treat it isostatically under a pressure of 250MPa for 3h.

[0047] (4) Carbonization: In a nitrogen atmosphere, the isostatic compacted material is heated to 800°C at a heating rate of 0.5°C / min, and then cooled naturally to obtain a carbon block containing micron-sized pores.

[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 is crushed, shaped, classified, demagnetized, and sieved to obtain 2# sampl...

Example Embodiment

[0050] Example 3

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

[0052] (2) Mix 8 μm microcrystalline graphite, catalyst / porogen composite, and petroleum pitch evenly according to 10:1:0.8.

[0053] (3) Isostatic pressing: Place the mixture in a rubber mold and treat it isostatically under a pressure of 200MPa for 1.5h.

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

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

[0056] (6) Finally, the graphitized block is crushed, shaped, classified, demagnetized, and sieved to obtain 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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