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Preparation method of stabilized lithium metal powder

A lithium metal powder and lithium metal technology are applied in the field of preparation of stabilized lithium metal powder, which can solve the problems of high cost, complicated process and low yield, and achieve the effects of ensuring chemical stability and prolonging service life.

Inactive Publication Date: 2017-01-04
东莞市亿顺新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ZL201210056121.9 discloses a stabilized lithium metal powder that can effectively improve the electrical conductivity and ion conductivity of the anode, but the preparation method of the stabilized lithium metal powder disclosed in the specification has complicated procedures, low yield and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of stabilized lithium metal powder provided in this embodiment comprises the following steps:

[0025] Step 1, adding low-temperature solid pitch with a melting temperature of less than 180°C into a jacketed reaction kettle, and heating to melt it;

[0026] Step 2: Under an argon atmosphere, cut lithium metal of battery grade purity into small pieces, the cross-sectional shape of the lithium metal after cutting into small pieces is rectangular, and the volume of the lithium metal after cutting into small pieces is less than 20cm 3 .

[0027] Step 3, under an argon atmosphere, add LiF and lithium metal in step 2 to the molten pitch, and stir, so that lithium metal and LiF are wrapped in the molten low-temperature solid pitch to obtain a precursor, in which lithium metal The mass percentages of LiF, LiF and low-temperature solid pitch are 10%, 20%, and 70%, respectively, and the median particle size of LiF is 500nm.

[0028] Step 4: Add the precurso...

Embodiment 2

[0030] A preparation method of stabilized lithium metal powder provided in this embodiment comprises the following steps:

[0031] Step 1, adding low-temperature solid pitch with a melting temperature of less than 180°C into a jacketed reaction kettle, and heating to melt it;

[0032] Step 2: Under a nitrogen atmosphere, cut lithium metal of battery grade purity into small pieces, the cross-sectional shape of the lithium metal after cutting into small pieces is circular, and the volume of the lithium metal after cutting into small pieces is less than 20cm 3 .

[0033] Step 3, under nitrogen atmosphere, the TiO 2 And the lithium metal of step 2 is added in the asphalt after the melting, stir, make lithium metal and TiO 2 Wrapped in the molten low-temperature solid pitch to obtain a precursor, in which lithium metal, TiO 2 and the mass percentages of low-temperature solid pitch are 15%, 25%, 60%, TiO 2 The median particle size is 1 μm.

[0034] Step 4: Add the precursor of ...

Embodiment 3

[0036] A preparation method of stabilized lithium metal powder provided in this embodiment comprises the following steps:

[0037] Step 1, adding low-temperature solid pitch with a melting temperature of less than 180°C into a jacketed reaction kettle, and heating to melt it;

[0038] Step 2: Under a nitrogen atmosphere, cut lithium metal of battery grade purity into small pieces, the cross-sectional shape of the lithium metal after cutting into small pieces is oval, and the volume of the lithium metal after cutting into small pieces is less than 20cm 3 .

[0039] Step 3, under nitrogen atmosphere, Al 2 o 3 And the lithium metal of step 2 is added in the asphalt after the melting, stirs, makes lithium metal and Al 2 o 3 Wrapped in the molten low-temperature solid pitch to obtain a precursor, in which lithium metal, Al 2 o 3 and the mass percentages of low-temperature solid pitch are 5%, 30%, 65%, Al 2 o 3 The median particle size is 5 μm.

[0040] Step 4: Add the prec...

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Abstract

The invention belongs to the technical field of lithium ion batteries and relates to a preparation method of stabilized lithium metal powder. The preparation method comprises adding low temperature solid asphalt into a reactor with a jacket, heating to melt the low temperature solid asphalt, cutting battery level purity lithium metal into small pieces in an inert atmosphere, adding a lithium ion good conductor and the lithium metal into the asphalt melt, carrying out stirring to obtain a precursor, adding the precursor into a graphitization furnace in an inert atmosphere and carrying out heating to realize asphalt graphitization. Compared with the prior art, the preparation method comprises melting low temperature solid asphalt, then adding the lithium ion good conductor and the small lithium metal pieces into the asphalt melt so that the lithium ion good conductor and the small lithium metal pieces are coated with the asphalt and carrying out asphalt graphitization so that the stabilized lithium metal powder with the graphite and lithium ion good conductor coating lithium metal surface is obtained. The preparation method is simple and easy and realizes a high yield and a low cost.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of stabilized lithium metal powder. Background technique [0002] During the formation process of lithium-ion batteries, part of the lithium is consumed due to the formation of the solid electrolyte film (SEI film), which causes the loss of lithium in the positive electrode material, thereby reducing the capacity of the battery and resulting in a decrease in the initial efficiency. This is especially evident in negative electrodes that use alloy materials (such as silicon alloys and tin alloys, etc.) as active materials. [0003] For this reason, people have explored various methods to supplement lithium to the negative electrode sheet of the battery. For example, patent applications CN101790806, CN1830110, CN101522343 and US2009 / 0035663 all disclose a kind of stabilized lithium metal powder and its method of supplementing lithium in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 朱剑峰黄猛
Owner 东莞市亿顺新材料有限公司
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