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Preparation method of negative electrode material

A technology for negative electrode materials and powder materials, which is applied in the field of preparation of negative electrode materials, can solve the problems of reducing the utilization rate of electrode active materials, etc., and achieve the effects of improved conductivity, increased capacity, and stable electrochemical performance.

Inactive Publication Date: 2016-02-24
百顺松涛(天津)动力电池科技发展有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] As the anode material of lithium-ion batteries, Si material has good safety, superior lithium storage capacity, and electrochemical capacity is much larger than that of ordinary carbon-based anode materials, which can meet the current development needs of power electric vehicles and various electronic mobile devices. However, during the electrochemical lithium intercalation process of Si, a complex phase transition occurs accompanied by a huge volume change, which will inevitably lead to the pulverization of Si and Si-based electrodes, which will reduce the utilization rate of electrode active materials. An important bottleneck in the commercial application of Si electrodes

Method used

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  • Preparation method of negative electrode material

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Embodiment 1

[0026] A preparation method of negative electrode material, comprising the steps of:

[0027] (1) Mix 10g of artificial graphite with 50mL of 1% H 2 o 2 The aqueous solution is stirred at high speed, the stirring rate is 500r / min, and the stirring time is 2h;

[0028] (2) take by weighing 45g Si powder, carry out liquid-phase ball milling with the mixed solution obtained in Si powder and step (1), the ball milling time is 30h;

[0029] (3) Use a vacuum pump to filter at 50°C for 3 hours, and drain the solvent to obtain a uniformly distributed precursor;

[0030] (4) Weigh 2g flocculent graphite and 19g precursor, carry out ball milling with flocculent graphite and precursor, ball milling time is 70h, obtains the powder that particle size is 20 μm;

[0031] (5) vacuumizing the powder obtained in step (4) for 24h;

[0032] (6) Sinter the powder after vacuuming in step (5) in a tube furnace in a mixture of argon and hydrogen in any proportion, the sintering temperature is 150...

Embodiment 2

[0034] A preparation method of negative electrode material, comprising the steps of:

[0035] (1) Mix 10g of artificial graphite with 10mL of 1% H 2 o 2 The aqueous solution is stirred at high speed, the stirring rate is 500r / min, and the stirring time is 2h;

[0036] (2) take by weighing 45g Si powder, carry out liquid-phase ball milling with the mixed solution obtained in Si powder and step (1), the ball milling time is 40h;

[0037] (3) Use a vacuum pump to filter at 100°C for 3 hours, and drain the solvent to obtain a uniformly distributed precursor;

[0038] (4) Weigh 2g flocculent graphite and 19g precursor, carry out ball milling with flocculent graphite and precursor, ball milling time is 70h, obtains the powder that particle size is 20 μm;

[0039] (5) vacuumizing the powder obtained in step (4) for 24h;

[0040] (6) Sinter the powder after vacuuming in step (5) in nitrogen in a tube furnace, the sintering temperature is 500°C, the sintering time is 18h, the cooli...

Embodiment 3

[0042] A preparation method of negative electrode material, comprising the steps of:

[0043] (1) Mix 10g of artificial graphite with 20mL of 1% H 2 o 2 The aqueous solution is stirred at high speed, the stirring rate is 500r / min, and the stirring time is 2h;

[0044] (2) take by weighing 45g Si powder, carry out liquid-phase ball milling with the mixed solution obtained in Si powder and step (1), the ball milling time is 48h;

[0045] (3) Suction filtration for 3 hours at 150°C with a vacuum pump, and dry the solvent to obtain a uniformly distributed precursor;

[0046] (4) Weigh 2g flocculent graphite and 19g precursor, carry out ball milling with flocculent graphite and precursor, ball milling time is 70h, obtains the powder that particle size is 20 μm;

[0047] (5) vacuumizing the powder obtained in step (4) for 24h;

[0048] (6) Sinter the powder after vacuuming in step (5) in neon gas in a tube furnace, the sintering temperature is 1000°C, the sintering time is 24h, ...

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Abstract

Belonging to the technical field of negative electrode materials for lithium batteries, the invention provides a preparation method of a negative electrode material. The method includes the steps of: (1) conducting high speed stirring on artificial graphite and a 1% H2O2 water solution; (2) weighing Si powder, and subjecting the Si powder and the mixed solution obtained in step (1) to liquid phase ball milling; (3) using a vacuum pump to pump the solvent to obtain a uniformly distributed precursor; (4) weighing floccus graphite, and subjecting the floccus graphite and the precursor obtained in step (3) to ball milling, thus obtaining powder; (5) performing vacuum pumping on the powder obtained in step (4); and (6) sintering the powder subjected to vacuum pumping in step (5) in an inert atmosphere in a tube furnace, and conducting cooling to obtain a modified negative electrode material. The negative electrode material prepared by the method provided by the invention has the advantages of strong lithium storage capacity, stable electrochemical performance, enhanced capacity, and improved electrical conductivity.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium batteries, in particular to a preparation method of negative electrode materials. Background technique [0002] As the anode material of lithium-ion batteries, Si material has good safety, superior lithium storage capacity, and electrochemical capacity is much larger than that of ordinary carbon-based anode materials, which can meet the current development needs of power electric vehicles and various electronic mobile devices. However, during the electrochemical lithium intercalation process of Si, a complex phase transition occurs accompanied by a huge volume change, which will inevitably lead to the pulverization of Si and Si-based electrodes, which will reduce the utilization rate of electrode active materials. An important bottleneck in the commercial application of Si electrodes. Contents of the invention [0003] The problem to be solved by the present inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/587
CPCH01M4/386H01M4/587Y02E60/10
Inventor 陈勇
Owner 百顺松涛(天津)动力电池科技发展有限公司
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