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Preparation method of modified microcrystalline graphite anode material for lithium ion battery

A lithium-ion battery and microcrystalline graphite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor performance of high-current charging and discharging, low initial charging and discharging efficiency, low charging and discharging voltage platform, etc., to achieve cycle Improve performance, improve graphitization degree, and improve tap density

Active Publication Date: 2016-09-28
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has high reversible specific capacity, low charge and discharge voltage platform, and small expansion when used as a negative electrode material for lithium-ion batteries, but has low initial charge and discharge efficiency, poor high current charge and discharge performance, low tap density, and large specific surface area. and other shortcomings

Method used

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  • Preparation method of modified microcrystalline graphite anode material for lithium ion battery

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Embodiment 1

[0015] A method for preparing a lithium-ion battery modified microcrystalline graphite negative electrode material, comprising the steps of:

[0016] 1) Shaping and crushing

[0017] Add natural microcrystalline graphite to a stirring ball mill for ball milling for 4 hours, then filter and dry to obtain the graphite powder after ball milling; in the ball mill, spherical zirconia is used as the grinding medium, with a diameter of 5mm; the slurry concentration is 20%; the mass ratio of ball to material is 10: 1; At the same time, add ammonium polyacrylate as a grinding aid, the mass of which is 0.5% of the graphite mass, and the target particle size D50=16 microns.

[0018] 2) Coating

[0019] After mixing the graphite powder obtained in step 1) with catalyst and pitch, vacuumize and heat and stir at 200° C. for 1 h; the vacuum degree is 2000 Pa, the stirring speed is 3000 rpm, and the weight ratio of graphite powder to catalyst and pitch is 1: 0.03: 0.1, the catalyst is ferri...

Embodiment 2

[0023] A method for preparing a lithium-ion battery modified microcrystalline graphite negative electrode material, comprising the steps of:

[0024] 1) Shaping and crushing

[0025] Add natural microcrystalline graphite to a stirring ball mill for ball milling for 1 h, then filter and dry to obtain the graphite powder after ball milling; in the ball mill, spherical zirconia is used as the grinding medium, with a diameter of 2mm; the concentration of the slurry is 5%; the mass ratio of the ball to material is 20: 1; At the same time, add sodium hexametaphosphate as a grinding aid, its mass is 0.1% of the graphite mass, and the target particle size D50=13 microns.

[0026] 2) Coating

[0027] After mixing the graphite powder obtained in step 1) with catalyst and pitch, vacuumize and heat and stir at 150°C for 0.5h; the vacuum degree is 500Pa, the stirring speed is 2500rpm, and the weight ratio of graphite powder to catalyst and pitch is 1:0.01 : 0.05, the catalyst is iron sul...

Embodiment 3

[0031] A method for preparing a lithium-ion battery modified microcrystalline graphite negative electrode material, comprising the steps of:

[0032] 1) Shaping and crushing

[0033] Add natural microcrystalline graphite to a stirring ball mill for ball milling for 2 hours, then filter and dry to obtain the graphite powder after ball milling; in the ball mill, spherical zirconia is used as the grinding medium, with a diameter of 4mm; the slurry concentration is 8%; the mass ratio of ball to material is 13: 1; At the same time, add ammonium polyacrylate or sodium hexametaphosphate as a grinding aid, the proportion is 0.3% of the graphite mass, and the target particle size D50 = 15 microns.

[0034] 2) Coating

[0035] After mixing the graphite powder obtained in step 1) with catalyst and pitch, vacuumize and heat and stir at 160°C for 0.8h; the vacuum degree is 1300Pa, the stirring speed is 2800rpm, and the weight ratio of graphite powder to catalyst and pitch is 1:0.02 : 0.0...

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Abstract

The invention discloses a preparation method of a modified microcrystalline graphite anode material for a lithium ion battery. The preparation method comprises the following steps: 1) shaping crushing: adding natural microcrystalline graphite into a stirred ball mill and ball-milling for 1-4 h, filtering and drying to obtain ball-milled graphite powder; 2) cladding: mixing the graphite powder obtained in the step 1) and a catalyst and asphalt, vacuumizing, heating at 150-200 DEG C and stirring for 0.5-1h, wherein vacuum degree is 500-2,000 Pa, and stirring speed is 2,500-3,000 rpm; and 3) graphitization: graphitizing the clad graphite powder for 10-48 h, and carbonizing at the carbonization temperature of 2,800-3,200 DEG C to obtain the modified microcrystalline graphite anode material. By graphitization, natural microcrystalline graphite is purified. As no poisonous and harmful reagents in a chemical purification method are involved, the method is green and environmental friendly. By adding a catalyst during the cladding process, degree of graphitization can be boosted, and capacity can be greatly increased. By cladding under vacuum, surface cladding can be effectively achieved, tap density is promoted, specific surface area is reduced, and cycle performance is greatly improved.

Description

technical field [0001] The invention relates to the technology in the field of electrode materials, and in particular provides a method for preparing a modified microcrystalline graphite negative electrode material for a lithium ion battery. Background technique [0002] Carbon materials have the advantages of low chemical potential, good cycle performance, low price, and environmental friendliness, and are currently the most ideal and commonly used anode materials for lithium-ion batteries. Among carbon materials, compared with soft carbon and hard carbon, graphite materials have obvious advantages in terms of specific capacity, discharge platform and cost. Lithium ions intercalate between graphite layers to form Li6C intercalation compound, which has a theoretical capacity of 372mAh / g. However, the conventional modified natural flake graphite has complete crystallization and large sheets, resulting in a long distance for lithium ion intercalation and extraction, and the i...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/62H01M10/0525
CPCH01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 宋宏芳赵东辉李芳戴涛周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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