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Surface modified graphitized interphase carbon micro-powder and preparation method thereof

A technology of mesophase carbon micropowder and surface modification, which is applied in the field of materials, can solve the problems of not improving the compaction performance of materials, not being able to greatly improve the lithium storage capacity, and not being very significant in product yield, and to achieve comprehensive battery integration. Excellent performance, improved initial discharge capacity, simple and easy preparation process

Active Publication Date: 2011-09-21
福建杉杉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are deficiencies in these current modification methods, or the preparation process is complicated, or the added ingredients are not easy to obtain, or the product yield is not very significant, which increases the production cost
They are all based on existing products, such as surface oxidation and surface coating of mesophase negative electrode materials, etc., which have improved the initial discharge capacity and discharge efficiency of the material, but the compaction performance of the material has not been improved, and the lithium storage capacity has been improved. Less than a substantial increase

Method used

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  • Surface modified graphitized interphase carbon micro-powder and preparation method thereof
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  • Surface modified graphitized interphase carbon micro-powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 120kg of mesophase carbon micropowder (D 50 = 41.2 μm), evenly add it into the crushing classifier, adjust the main frequency of the crushing and classifier to 15.35Hz, set the external classification speed to 1000 rpm, and obtain F1 (D) after crushing and classifying. 50 = 25.6 μm) material 113 kg. Mix 113kg of mesophase carbon powder F1 with 5kg of additives (Fe 2 O 3 : SiO 2 = 1:3, weight ratio) alternately added to the cantilever double-spiral conical mixer, after mixing for 2 hours, the material was subjected to catalytic graphitization (2500° C.) for 6 hours to obtain 100 kg of graphitized post-material F1a. It is mixed with 100kg of ball material (polyurethane composite ball diameters are Φ15, Φ20, Φ30 each accounting for 1 / 3 of the weight) and put into a ball mill, set the ball mill rotational speed to 60 rev / min, and run for 20 hours to obtain the intermediate phase of the present invention. The graphite carbon anode material was 98kg, and the yield w...

Embodiment 2

[0032] Weigh 120kg of mesophase carbon micropowder (D 50 = 38.5μm), evenly add it into the crushing and classifying machine, adjust the frequency of the main machine of the crushing and classifying machine to 13.26Hz, set the external classification speed to 1000 rpm, and obtain F1 (D) after crushing and classifying. 50 = 26.4 μm) material 115 kg. Mix 115kg of mesophase carbon powder F1 with 5kg of additives (Fe 2 O 3 : SiO2 =1:1, weight ratio) was alternately added to the cantilever double-spiral conical mixer, and after mixing for 2 hours, the material was subjected to catalytic graphitization (2600° C.) for 5 hours to obtain 103 kg of graphitized material F1a. After mixing it with 100kg of ball material (same as Example 1), it was loaded into a ball mill, and the rotation speed of the ball mill was set to 60 rev / min, and it was operated for 20 hours to obtain 101kg of the mesophase graphite carbon negative electrode material of the present invention, and the yield was 84....

Embodiment 3

[0034] Weigh 120kg of mesophase carbon micropowder (D 50 =40.07μm), evenly add it into the crushing and classifying machine, adjust the frequency of the main machine of the crushing and classifying machine to 14.00Hz, set the external classification speed to 1000 rpm, and obtain F1 (D) after crushing and classifying. 50 = 26.7 μm) material 115 kg. Mix 115kg of mesophase carbon powder F1 with 5kg of additives (Fe 2 O 3 : SiC=1:3, weight ratio) was alternately added to the cantilever double-spiral conical mixer, mixed for 2 hours, and then subjected to catalytic graphitization (2800° C.) for 3 hours to obtain 99 kg of graphitized post-material F1a. After mixing it with 100kg of ball material (same as Example 1), it was loaded into a ball mill, the ball mill rotation speed was set to 60 rpm, and it was operated for 20 hours to obtain 97kg of the mesophase graphite carbon negative electrode material of the present invention, and the yield was 80.8%.

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Abstract

The invention provides surface modified graphitized interphase carbon micro-powder and a preparation method thereof. The method comprises the following steps of: (1) performing pretreatment to crush the raw material of the interphase carbon micro-powder; (2) adding an additive and fully mixing; (3) performing graphitization treatment; and (4) performing ball-grinding and shaping treatment. As an anode material of a lithium battery, the obtained surface modified graphitized interphase carbon micro-powder has the advantages of the conventional interphase carbon canoed materials, improves the compacted density and the first discharge capacitance, reduces the specific area, produces cells with high comprehensive performance and therefore is a new replacement product of the interphase anode material.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a surface-modified graphitized mesophase carbon micropowder and a preparation method thereof. Background technique [0002] The mesophase carbon micropowder graphitization product is an excellent negative electrode material for lithium-ion batteries. In recent years, lithium-ion batteries have been widely used in mobile phones, notebook computers, digital cameras and portable appliances. Lithium-ion batteries have excellent performance in terms of high energy density, high operating voltage, small size, light weight, no pollution, fast charge and discharge, and long cycle life. They are an ideal energy source for the development of the 21st century. As a negative electrode material for lithium-ion secondary batteries, mesocarbon micropowder has the characteristics of low potential, good flatness, large specific gravity, high initial charge and discharge efficiency, and good processabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/38H01M4/133H01M10/0525
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 李念民谢秋生陈俊池淑芬
Owner 福建杉杉科技有限公司
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