Preparation method of high-power carbon-coated synthetic graphite negative electrode material

An artificial graphite negative electrode, carbon coating technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems affecting battery cycle performance, graphite layer peeling, pulverization, etc., achieve good application performance, reduce graphitization cost, Yield-enhancing effect

Inactive Publication Date: 2018-01-12
福建杉杉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the interlayer spacing of graphite is smaller than the interlayer spacing of graphite lithium intercalation compounds, the interlayer spacing of graphite changes during charging and discharging, which may easily cause the graphite layer to peel off and pulverize, and lithium ions and organic solvent molecules will also intercalate into the graphite layer and Organic solvents decompose, thereby affecting battery cycle performance

Method used

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  • Preparation method of high-power carbon-coated synthetic graphite negative electrode material
  • Preparation method of high-power carbon-coated synthetic graphite negative electrode material
  • Preparation method of high-power carbon-coated synthetic graphite negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Weigh 100 kg of coal-based green coke raw material A, crush and process it to 5.0 μm.

[0036] The raw material B of coal tar pitch was weighed, crushed and classified to form a fine powder with a particle size of 2.5 μm.

[0037] The pulverized fine powder of material A is modified at a temperature of 630°C, and then graphitized at room temperature at 2700-2800°C for 50 hours in a resistance graphitization furnace.

[0038] The graphitized material is dispersed and graded to obtain a single particle of artificial graphite with a particle size of 5.0-5.5 μm.

[0039] Weigh 15kg of 5.0-5.5μm single-particle artificial graphite, add 0.6kg of pulverized raw material B, mix well and put it into the fusion machine, modify it at a frequency of 45Hz for 4.5min, and the modified material is processed in a pusher kiln. Medium temperature carbonization treatment at 1150°C for 12 hours to cure the cladding layer.

[0040] The carbonized material is mixed and classified with a co...

Embodiment 2

[0046] Weigh 100 kg of coal-based green coke raw material A, crush and process it to 7.0 μm.

[0047] The raw material B of coal tar pitch was weighed, crushed and classified to form a fine powder with a particle size of 2.5 μm.

[0048] The pulverized fine powder of material A is modified at a temperature of 630°C, and then graphitized at room temperature at 2700-2800°C for 50 hours in a resistance graphitization furnace.

[0049] The graphitized material is dispersed and graded to obtain a single particle of artificial graphite with a particle size of 7.0-7.5 μm.

[0050] The graphitized materials were dispersed and graded. Weighed 15kg of the graded materials, added 0.6kg of pulverized raw material B, mixed evenly and put them into the fusion machine, and modified them at a frequency of 45Hz for 4.5min. After modification, The material is carbonized at a temperature of 1150°C for 12 hours in a pusher kiln to solidify the coating layer.

[0051] The carbonized material is ...

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Abstract

The invention relates to the technical field of carbon-coated synthetic graphite negative electrode materials, in particular to a preparation method of a high-power carbon-coated synthetic graphite negative electrode material. The preparation method is characterized by comprising the following steps: crushing coal-measure green coke serving as a raw material A, so as to form a micro powder; crushing and grading asphalt serving a raw material B, so as to form a micro powder; performing modified heat treatment on the micro powder of the raw material A, and then performing normal temperature graphitization in a resistance type graphitization furnace; mixing and sieving obtained materials subjected to graphitization, so as to obtain a single particle graphitization product; uniformly mixing the single particle graphitization product and the micro powder of the raw material B, so as to perform coated modification; performing carbonizing treatment on materials subjected to coated modification, so as to solidify a coated layer; cooling the material to a room temperature, and mixing and sieving, so as to obtain a product. Compared with the prior art, the preparation method has the advantages that the electrode material has smaller reaction impedance, and the low-temperature performance and power characteristic of the material are enhanced; the cycling performance of the material is improved, meanwhile the graphitization cost is reduced, and the purpose of energy conservation is achieved.

Description

technical field [0001] The invention relates to the technical field of carbon-coated artificial graphite negative electrode materials, in particular to a preparation method of high-power carbon-coated artificial graphite negative electrode materials. Background technique [0002] Lithium-ion batteries are a new type of environmentally friendly batteries that have developed rapidly in the past decade. They have outstanding advantages such as high energy density, long cycle life, less self-discharge, no memory effect, and environmental protection. It uses lithium-intercalated carbon material instead of metal lithium as the negative electrode material, which overcomes the problem of poor safety caused by lithium dendrites in the past, and ensures the main characteristics of lithium batteries such as high voltage and high specific energy. A new generation of batteries after storage batteries, nickel-cadmium batteries, and nickel-hydrogen batteries are widely used in portable ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCY02E60/10
Inventor 朱丽萍苗荣荣吴志红张华吴仙斌李富营
Owner 福建杉杉科技有限公司
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