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Preparation method of submicron-nano lithium metal particles

A nano-metal and sub-micron technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of large median particle size of metal lithium powder, strong corrosion of metal lithium, and complicated preparation methods, and achieve low vapor pressure and production. Low cost and improved reactivity

Active Publication Date: 2017-10-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the high reactivity, high viscosity and good ductility of metal lithium itself make it difficult to synthesize micro-nanoscale metal lithium powders by mechanical pulverization and other common methods.
The currently adopted method of dispersing metal lithium powder in inert hydrocarbon oil after melting has the following problems: the operating temperature is high and needs to exceed the melting point of metal lithium; the molten metal lithium is highly corrosive and requires relatively harsh equipment; Hydrocarbon oil with high boiling point is used to disperse the droplets of molten lithium, and hydrocarbon oil with low boiling point is also required for washing lithium powder, resulting in large environmental pollution, cumbersome preparation methods, and low production yield; the median particle size of the prepared lithium metal powder is The diameter is still large, between 10-500μm, and it is impossible to prepare submicron-nanoscale lithium powder

Method used

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  • Preparation method of submicron-nano lithium metal particles
  • Preparation method of submicron-nano lithium metal particles

Examples

Experimental program
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Effect test

Embodiment 1

[0036] In a glove box under an argon atmosphere, 10 mL of N-propyl-N-methylpyrrolidine bis(trifluoromethanesulfonyl)imide salt ([C 3 mPyr + ][TFSI - ]) into a stainless steel ball mill jar, then heated to 250 ° C, and kept for 1 hour to remove the moisture. [C 3 mPyr + ][TFSI - ] Cool down to 170°C, add 1.5g of lithium particles with a particle size between 1 and 2mm; use an ultrasonic crusher to perform ultrasonic crushing, keep the ultrasonic power at 60W, and the ultrasonic time is 30 minutes; after washing the obtained product with n-hexane, After centrifugation and drying, metal lithium particles are obtained.

[0037] figure 1 The scanning electron microscope image of the prepared metal lithium particles, the scanning electron microscope image shows that the shape of the prepared metal lithium particles is relatively regular, generally spherical, and the particle size of the metal lithium particles is mainly distributed in the range of 10-100nm.

[0038] Nickel fo...

Embodiment 2

[0043] In dry air, 8 mL of N-butyl-N-methylpyrrolidine bis(fluoromethanesulfonyl)imide ([C 4 mPyr + ][FSI - ]) in a plastic centrifuge tube, and then heated to 300 ° C, and kept for 4 hours to remove the water. Then [C 3 mPyr + ][FSI - ] Cool down to 160°C, add 3.5g of lithium particles with a particle size of 3 to 5mm, and start ultrasonic crushing using an ultrasonic crusher with an ultrasonic power of 100W and a crushing time of 2.5 hours. The product is washed with diethyl carbonate, centrifuged and dried to obtain metal lithium particles, and the particle diameter of the obtained metal lithium particles is below 300 nanometers.

Embodiment 3

[0045] In a glove box under an argon atmosphere, 50 mL of N-butyl-N-methylpiperidine bis(trifluoromethanesulfonyl)imide salt ([Pp 14 + ][TFSI - ]) into a plastic bottle with a cap, then heated to 200° C. and kept for 8 hours to remove moisture. Then [Pp 14 + ][TFSI - ] Cool down to 150°C, add 7.5g of electrode-grade lithium flakes with a diameter of 10mm and a thickness of 0.7mm, and start ultrasonic crushing using an ultrasonic crusher with an ultrasonic power of 250W and a crushing time of 15 minutes. The product is washed with 1,3-dioxolane, and then subjected to vacuum filtration to obtain metal lithium particles, and the particle diameter of the obtained metal lithium particles is below 500 nanometers.

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Abstract

The invention discloses a preparation method of submicron-nano lithium metal particles. The preparation method includes the steps of blending raw materials of lithium metal with ionic liquid under an atmosphere of inert gas or dry air, and sequentially conducting treatment of heating and ultrasonic disruption to obtain ionic liquid containing the submicron-nano lithium metal particles; conducting later processing to obtain the lithium metal particles. According to the preparation method of the submicron-nano lithium metal particles, by conducting the treatment of heating and ultrasonic disruption on the ionic liquid containing the raw materials of the lithium metal, the submicron-nano lithium metal particles are prepared, the reaction activity of the lithium materials is greatly improved, the preparation time of the lithium metal particles is shortened, and the preparation efficiency of the lithium metal particles is improved.

Description

technical field [0001] The invention relates to the preparation of metal lithium particles, in particular to a preparation method of submicron-nano metal lithium particles. Background technique [0002] With the development of science and technology and the progress of human society, the problems of energy depletion and environmental pollution have become increasingly prominent. The development of new efficient and clean energy conversion, storage technologies and energy utilization methods has become the key to solving these problems and realizing the sustainable development of human society. Chemical power supply is an important technical approach to alleviate energy, resource and environmental crises, and plays an important role in the social energy system. [0003] Lithium is a silver-white metal with a very light texture (density 0.59g / cm 3 ), good ductility and conductivity. The theoretical specific capacity of metal lithium is as high as 3860mAh / g, which is one of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04H01M4/38
CPCB22F9/04B22F2009/042B22F2009/049B22F2999/00H01M4/382B22F2202/01B22F2201/11B22F2201/50Y02E60/10
Inventor 刘永锋蒲凯超高明霞潘洪革
Owner ZHEJIANG UNIV
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