Lithium battery negative electrode material and preparation method thereof

A negative electrode material, lithium battery technology, applied in the direction of battery electrodes, lithium batteries, negative electrodes, etc., can solve the problems of poor isotropy performance, low degree of graphitization, low energy density, etc., to reduce unit energy consumption, graphite The effect of high degree of chemical transformation and high energy density

Inactive Publication Date: 2014-06-11
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to overcome the defects of the existing lithium battery negative electrode materials such as low graphitization degree, low energy density and poor isotropic performance, and provide a lithium battery negative electrode material and its preparation method

Method used

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  • Lithium battery negative electrode material and preparation method thereof
  • Lithium battery negative electrode material and preparation method thereof
  • Lithium battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Add 1kg of silicon powder (the medium particle size D50 is 4.5μm) into 20kg pitch coke powder (the medium particle size D50 is 7.3μm), mix well, heat to 200°C, then add 5kg of molten petroleum pitch and continue heating Stir for 2 hours (rotation speed is 20 rpm), until the material is evenly mixed.

[0032] (2) Remove the mixture obtained in step (1), put it into a mold, vibrate and press it into a carbon block with a diameter of 30 cm and a height of 12 cm, and the bulk density of the carbon block is 1.62g / cm 3 .

[0033] (3) Carbonize the carbon block obtained in step (2), the carbonization temperature is 800°C, and the carbonization time is 20 hours.

[0034] (4) Graphitize the carbon block obtained in step (3), the graphitization temperature is 2800°C, and the graphitization time is 48 hours.

[0035] (5) The carbon block obtained in step (4) is pulverized to obtain lithium battery negative electrode material powder, and the median particle size D50 is 21 μm....

Embodiment 2

[0043] (1) Add 2.5kg of ferric oxide powder (median particle size D50 is 5.1μm) into 20kg of natural graphite powder (median particle size D50 is 16.8μm), mix well, heat to 200°C, then add 1kg of molten petroleum Asphalt, continue to heat and stir for 2 hours (30 rpm), until the petroleum asphalt is completely dispersed.

[0044](2) Remove the mixture obtained in step (1), put it into a mold, and press it into a carbon block with a diameter of 30 cm and a height of 12 cm, and the bulk density of the carbon block is 1.48 g / cm 3 .

[0045] (3) Carbonize the carbon block obtained in step (2), the carbonization temperature is 1100°C, and the carbonization time is 8 hours.

[0046] (4) Graphitize the carbon block obtained in step (3), the graphitization temperature is 2500°C, and the graphitization time is 36 hours.

[0047] (5) The carbon block obtained in step (4) is pulverized, and the median particle size D50 is 18.5 μm.

[0048] The electrochemical test steps are the same a...

Embodiment 3

[0051] (1) Add 2kg of boron trioxide powder (medium particle size D50 is 7.5μm) into 20kg of petroleum coke powder (medium particle size D50 is 10.8μm), mix well, heat to 200°C, then add 20kg of molten coal tar pitch , continue to heat and stir for 4 hours (rotation speed is 25 rpm), until the coal tar pitch is completely dispersed and evenly distributed.

[0052] (2) Remove the mixture obtained in step (1), put it into a mold, and press it into a carbon block with a diameter of 30 cm and a height of 12 cm. The bulk density of the carbon block is 1.82g / cm 3 .

[0053] (3) Carbonize the carbon block obtained in step (2), the carbonization temperature is 1100°C, and the carbonization time is 40 hours.

[0054] (4) Graphitize the carbon block obtained in step (3), the graphitization temperature is 3000°C, and the graphitization time is 48 hours.

[0055] (5) The carbon block obtained in step (4) is pulverized, and the median particle size D50 is 15.5 μm.

[0056] The electroch...

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Abstract

The invention discloses a lithium battery negative electrode material and a preparation method thereof. The preparation method of the lithium battery negative electrode material comprises the following steps of heating and stirring a mixture of carbon powder, a binder and a catalyst, pressing and molding, carbonizing, and graphitizing the mixture. The prepared lithium battery negative electrode material is high in graphitization degree, good in isotropic property, high in energy density, good in cycling property and low in preparation cost; the preparation process combining the molding graphitization and catalytic graphitization is also applicable to the graphitization process of other powder materials.

Description

technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, in particular to a lithium battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have developed rapidly since Sony Corporation of Japan first developed and industrialized secondary lithium-ion batteries using graphite as the negative electrode in the 1990s. In this battery system, graphite is used instead of metal lithium anode, the safety performance of the battery is greatly improved, and the cycle life is longer, and the charge and discharge efficiency of the battery is also improved. The research and development of lithium compounds and the development of negative electrode materials have played a decisive role in the development of lithium-ion batteries. With the increasingly multi-functionalization of many portable small electrical appliances such as mobile phones, notebook computers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/583H01M4/587H01M10/052H01M2004/027Y02E60/10
Inventor 乔永民吴志红李杰南明哲刘铁军池淑芬王弘奇
Owner SHANGHAI SHANSHAN TECH CO LTD
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