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Coal-based composite negative electrode material used for power lithium ion battery and preparation method of composite negative electrode material

A lithium-ion battery and negative electrode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficulty in meeting the high demand for energy density of power lithium-ion batteries, easy corrosion and purification of equipment, and unfavorable industrialization. The effect of easy control of process conditions, low production cost and long cycle life

Inactive Publication Date: 2018-05-18
博尔特新材料(银川)有限公司
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

Chinese Patent Publication No. 106099105A discloses a spherical porous artificial graphite negative electrode material. After anthracite ball milling, impurity removal, dispersion, coating, and high-temperature heat treatment, a porous spherical artificial graphite negative electrode material with a purity of more than 99.9% is prepared. Although the material is 0.5 The reversible capacity of C can reach 390mAh / g, but the use of pickling and purification in the impurity removal process will easily pollute the environment and is not conducive to industrialization
Chinese Patent Publication No. 104681786A discloses a coal-based negative electrode material, a preparation method, and a lithium-ion battery. The coal-based material is purified by introducing a purified gas reaction during the graphitization process, which has the problems of easy corrosion of the equipment and uneven purification. At the same time The reversible capacity of the material prepared by this method is about 350mAh / g, which is difficult to meet the high demand for energy density of power lithium-ion batteries

Method used

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  • Coal-based composite negative electrode material used for power lithium ion battery and preparation method of composite negative electrode material
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  • Coal-based composite negative electrode material used for power lithium ion battery and preparation method of composite negative electrode material

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preparation example Construction

[0035] In the preparation method of the coal-based composite negative electrode material for power lithium-ion batteries of the present invention, the matrix uses Ningxia Taixi coal as a raw material, and under the action of light metal halide salt purification additives and carbonizable binders, it undergoes crushing and shaping, batching, compacting, High-temperature graphitization prepares a high-purity secondary particle coal-based negative electrode material precursor, which is then pulverized and sieved, and then combined with soluble phenolic resin, ethoxy and propoxy under the action of an alcohol solvent The amphoteric triblock copolymer pore-forming additive liquid phase is uniformly dispersed, and after solidification and pyrolysis treatment, a coal-based composite negative electrode material for power lithium-ion batteries with a mesoporous carbon-coated matrix is ​​finally prepared. The specific steps are:

[0036] 1. Crush

[0037] At room temperature (20° C.), ...

Embodiment 1

[0073] 1. Crush

[0074] The anthracite Ningxia Taixi coal was pulverized into anthracite fine powder with an average particle diameter D50 of 2.0 μm by a universal pulverizer.

[0075] 2. Ingredients mixing

[0076] Weigh 1000g of anthracite micropowder, 20.0g of furan resin, and 10.0g of sodium chloride, respectively, and add them to a drum mixer at a heating rate of 0°C / min and a rotation speed of 1100rpm, and mix at 25°C for 180min to obtain a mixed material.

[0077] 3. Compacted

[0078] Utilize a press to forge the mixed material at a pressure of 10MPa for 10h to obtain a green body with a diameter of 300×a height of 200mm.

[0079] 4. High temperature graphitization

[0080] Place the green body in an intermediate frequency induction graphitization furnace, and feed nitrogen with a flow rate of 1.0m 3 / h, at a heating rate of 5 °C / min, the temperature was raised to 2000 °C, graphitized for 9 h, cooled naturally in the furnace to room temperature, crushed and sieved...

Embodiment 2

[0088] 1. Crush

[0089] Anthracite Ningxia Taixi coal was pulverized into anthracite fine powder with an average particle diameter D50 of 3.0 μm by a universal pulverizer.

[0090] 2. Ingredients mixing

[0091] Weigh 1000g of anthracite micropowder, 56.0g of furan resin, and 23.0g of sodium fluoride, respectively, and add them to a conical mixer with a heating rate of 1°C / min and a rotation speed of 900rpm, and mix at 50°C for 150min to obtain a mixed material.

[0092] 3. Compacted

[0093] The mixed material was forged under a pressure of 28 MPa for 8 hours by a hydraulic press to obtain a green body with a diameter of 300×a height of 200 mm.

[0094] 4. High temperature graphitization

[0095] Place the green body in a medium frequency induction graphitization furnace, inject helium gas with a flow rate of 1.3m 3 / h, at a heating rate of 7 °C / min, the temperature was raised to 2200 °C, graphitized for 8 h, cooled naturally in the furnace to room temperature, crushed a...

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Abstract

The invention discloses a coal-based composite negative electrode material used for a power lithium ion battery and a preparation method of the composite negative electrode material, and aims to solvethe technical problems for lowering production cost, protecting the environment, and adapting for large-scale industrial production. The coal-based composite negative electrode material used for thepower lithium ion battery takes graphitized anthracite coal with 75-90% of degree of graphitization as the substrate; the exterior of the substrate is coated with mesoporous carbon; and a mesoporous carbon coating layer accounts for 2.0-7.5% of the mass of the substrate. The preparation method of the coal-based composite negative electrode material used for the power lithium ion battery comprisesthe following steps of performing smashing, material preparing and mixing, blank pressing, high-temperature graphitization, coating and curing, and pyrolysis. Compared with the prior art, the coal-based composite negative electrode material used for the power lithium ion battery has high capacity, high-rate charging-discharging performance, long cycle life, environment friendliness, simple preparation method, easy control of the technological conditions, low production cost, and suitability for large-scale industrial production.

Description

technical field [0001] The invention relates to a new energy material, in particular to a power lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] At present, commercialized lithium-ion batteries mainly use graphite-like carbon materials as negative electrode active materials, including natural graphite and artificial graphite. Natural graphite is used as the negative electrode material of lithium-ion batteries. It has the advantages of high discharge specific capacity and good processing performance, but its high and low temperature performance is not good, and at the same time, it has poor compatibility with organic electrolytes, and graphite flakes are prone to peeling off during charging and discharging. , affect the high current charge and discharge performance and cycle life. The prior art adopts spheroidization treatment, surface micro-oxidation, surface coating, surface organicization and element doping mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525C04B35/52C04B35/622
CPCC04B35/522C04B35/622C04B2235/444C04B2235/445C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96H01M4/366H01M4/587H01M10/0525Y02E60/10
Inventor 王兴蔚王北平侯佼马少宁侯春平龚波林
Owner 博尔特新材料(银川)有限公司
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