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A method for large-scale and efficient purification of lithium metal particles

A metal lithium, large-scale technology, applied in chemical instruments and methods, separation methods, solid solvent extraction and other directions, can solve problems such as restricting battery energy density, achieve large-scale controllable separation, simple methods, and easy market promotion. Effect

Active Publication Date: 2019-04-26
北京恩耐吉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite is currently widely used as an anode material for lithium-ion batteries. Due to its theoretical capacity of only 372mAh / g, the energy density of the battery is restricted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The invention provides a method for large-scale and high-efficiency purification of lithium metal particles, comprising the following steps:

[0021] 1) Put 300ml of the mixture containing metal lithium particles with a size between 10-15 microns and silicone oil into a 500ml separatory funnel, plug the funnel cover tightly, and let it stand for 72 hours to allow the mixture to stand naturally layered;

[0022] 2) After the stratification is completed, release all the silicone oil in the lower layer of the separatory funnel after stratification, with a volume of about 275 ml;

[0023] 3) Add 250 ml of n-hexane, a non-polar solvent with stable properties at room temperature, to the separatory funnel, and shake it several times to fully mix n-hexane, metal lithium particles, and a small amount of residual silicone oil to obtain a uniform suspension;

[0024] 4) Let the homogeneous suspension obtained in the above step 3) stand for 2 hours for natural stratification;

[...

Embodiment 2

[0027] The invention provides a method for large-scale and high-efficiency purification of lithium metal particles, comprising the following steps:

[0028] 1) Put 250 ml of the mixture containing lithium metal particles with a size of 20-25 microns and silicone oil into a 500 ml separating funnel, plug the funnel cover tightly, and let it stand for 72 hours to allow the mixture to stand naturally and stratify ;

[0029] 2) After the stratification is completed, release all the silicone oil in the lower layer of the separatory funnel after stratification, with a volume of about 225 ml;

[0030] 3) Add 200 ml of n-hexane, a non-polar solvent that is stable at room temperature, into the separatory funnel, and shake it several times to fully mix n-hexane, metal lithium particles, and a small amount of residual silicone oil to obtain a uniform suspension;

[0031] 4) Let the homogeneous suspension obtained in the above step 3) stand for 2 hours for natural stratification;

[003...

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PUM

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Abstract

The invention provides a method for efficiently purifying metal lithium particles in a large scale. The method comprises the following steps: putting a mixture containing metal lithium particles and organic silicone oil into a separating funnel, tightly plugging the funnel, and standing for 72 hours to layer the mixture; discharging the organic silicone oil in the lower layer of the separating funnel; adding a nonpolar solvent normal hexane with stable property into the separating funnel, shaking to sufficiently and uniformly mix the normal hexane with metal lithium particles and residual organic silicone oil; standing for 2 hours for layering; separating normal hexane and organic silicone oil mixed liquid at the lower layer from the opening of the separating funnel, transferring the lithium metal particles and a small amount of normal hexane at the upper layer into a narrow-mouthed bottle, and storing in an argon protected glove box for later use. According to the method, high-purity metal lithium particles can be obtained, large-scale controllable separation can be realized, and the method is simple and convenient for market popularization.

Description

technical field [0001] The invention relates to the technical field of separation and purification of chemical materials, in particular to a method for large-scale and high-efficiency purification of lithium metal particles. Background technique [0002] Lithium-ion batteries are popular as power sources for mobile devices due to their high energy density, light weight, and long life. In 1991, Sony Corporation commercialized lithium-ion batteries for the first time, which has since opened up a global research boom in lithium-ion battery materials. However, as far as the energy density of the lithium-ion battery itself is concerned, its capacity is closely related to the type of electrode material. The development of high-capacity electrode materials has always been one of the core tasks of lithium-ion battery workers around the world. Graphite is currently widely used as an anode material for lithium-ion batteries. Because it only has a theoretical capacity of 372mAh / g, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/02
CPCB01D11/0288
Inventor 吴黎明葛曜闻
Owner 北京恩耐吉科技有限公司