Synthetic graphite negative electrode material and preparation method thereof

An artificial graphite negative electrode and graphitization technology, which is applied in the field of lithium-ion batteries, can solve the problems of low discharge capacity and insufficient compaction density, and achieve the effects of good electrochemical performance, excellent comprehensive performance, and good safety

Active Publication Date: 2014-11-12
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of insufficient compaction density and low discharge capacity of the artificial graphite negative electrode material obtained by the existing negative electrode material preparation method, and provide an artificial graphite negative electrode material and its preparation method

Method used

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  • Synthetic graphite negative electrode material and preparation method thereof
  • Synthetic graphite negative electrode material and preparation method thereof
  • Synthetic graphite negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Add 60kg of spherical natural graphite (D50 is 19.1μm), needle coke green coke powder (D50 is 15.4μm) 140kg and graphitization catalyst (SiO 2 ) 16kg, mixed evenly to obtain a mixture;

[0035] (2) Mix the mixture with 60kg of petroleum pitch powder (which has been crushed to below 0.1mm) in a kneading pot, and knead at 160°C for 1 hour;

[0036] (3) After the kneading is completed, press it into a sheet (thickness 4mm) in a tablet press, crush it into particles with an average particle size of less than 100 μm, and mold it into a briquette;

[0037] (4) Under the protection of nitrogen, carbonize at a temperature of 1100 ° C for 2 hours, and then cool the reaction product to room temperature;

[0038] (5) Catalytic graphitization high temperature treatment was carried out at 2800°C for 36 hours to obtain an artificial graphite anode material with a particle size D50 of 18.4 μm, a half-cell capacity of 361.8mAh / g, and an initial efficiency of 93.1%.

Embodiment 2

[0040](1) Add 80kg of spherical natural graphite (D50 is 19.5μm), 120kg of needle coke green coke powder (D50 is 15.4μm) and 6kg of graphitization catalyst (SiC) alternately under stirring, and mix well to obtain a mixture;

[0041] (2) Mix the mixture with 20kg of petroleum pitch powder (which has been crushed to below 0.1mm) in a kneading pot, and knead at 160°C for 1 hour;

[0042] (3) After the kneading is completed, press it into a tablet shape (thickness: 3 mm), crush it into particles with an average particle size of less than 100 μm, and mold it into a briquette;

[0043] (4) Under the protection of nitrogen, carbonize at a temperature of 800 ° C for 6 hours, and then cool the reaction product to room temperature;

[0044] (5) Catalytic graphitization high temperature treatment was carried out at 3000°C for 48 hours to obtain an artificial graphite anode material with a particle size D50 of 17.9 μm, a half-cell capacity of 362.7mAh / g, and an initial efficiency of 92.8%...

Embodiment 3

[0046] (1) Add 100kg of spherical natural graphite (D50 is 20.1μm), 100kg of needle coke raw coke powder (D50 is 19.8μm) and graphitization catalyst (SiO 2 ) 10kg, mixed evenly to obtain a mixture;

[0047] (2) Mix the mixture with 40kg of coal tar pitch powder (which has been crushed to less than 0.1mm) in a kneading pot, and knead at 160°C for 1 hour;

[0048] (3) After the kneading is completed, press it into a tablet shape (thickness: 5 mm), crush it into particles with an average particle size of less than 100 μm, and mold it into a briquette;

[0049] (4) Under the protection of nitrogen, carbonize at a temperature of 1500 ° C for 3 hours, and then cool the reaction product to room temperature;

[0050] (5) Catalytic graphitization high temperature treatment was carried out at 3200°C for 48 hours to obtain an artificial graphite anode material with a particle size D50 of 20.4 μm, a half-cell capacity of 366.5mAh / g, and an initial efficiency of 92.0%.

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Abstract

The invention discloses a synthetic graphite negative electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) uniformly mixing spherical natural graphite, needle coke-produced coke powder and a graphitization catalyst so as to obtain a mixture; 2) subjecting the mixture and an adhesive which can be graphitized to heating and kneading for 1 to 2 h; 3) pressing the kneaded object into a block shape so as to obtain a formed body of the kneaded object; 4) charring the formed body at 800 to 1500 DEG C under the protection of inert gas and cooling the charred formed body to room temperature; and 5) carrying out catalytic graphitization high temperature treatment at 2800 to 3200 DEG C. The method provided by the invention overcomes the defects of insufficient compacted density and low discharge capacity of a synthetic graphite negative electrode material prepared by using a conventional negative electrode preparation method, can improve cycle performance of the negative electrode material and enables the synthetic graphite negative electrode material with high charge and discharge capacity and high charge and discharge efficiency to be obtained.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an artificial graphite negative electrode material and a preparation method thereof. Background technique [0002] In recent years, lithium-ion batteries have been widely used in mobile phones, notebook computers, digital video cameras and portable appliances. Lithium-ion batteries have excellent performances such as high energy density, high working voltage, small size, light weight, no pollution, fast charging and discharging, and long cycle life. They are ideal energy sources for development in the 21st century. With the increasing requirements of various products for small, lightweight, multi-functional, and long-term driving, the improvement of lithium-ion battery capacity and high-current discharge performance will still depend on the development and improvement of negative electrode materials. Therefore, for a long time, improving the specific capacity of lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 谢秋生杜辉玉张鹏昌薄维通陈志明
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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