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Surface in-situ processing method of metal lithium negative electrode and application

An in-situ treatment, metal lithium technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the uneven distribution of electric field on the surface of metal lithium, the formation of uneven lithium deposition, the formation of lithium dendrites, and the uneven microscopic surface of metal lithium. problems such as leveling, to achieve the effect of being suitable for large-scale production, solving continuous cracking and self-repairing, and simple preparation method

Active Publication Date: 2016-01-27
BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its preparation method is relatively complicated, and it is difficult to realize industrialization
[0005] In addition, according to the research results of Aurbach et al., in the actual metal lithium secondary battery, the original passivation film (Li 2 CO 3 , LiOH, Li 2 The partial dissolution of O) and the formation of SEI film often cause the unevenness of the microscopic surface of lithium metal.
As a result, the electric field distribution on the surface of metallic lithium is uneven, resulting in uneven deposition of lithium and the formation of lithium dendrites.

Method used

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  • Surface in-situ processing method of metal lithium negative electrode and application
  • Surface in-situ processing method of metal lithium negative electrode and application
  • Surface in-situ processing method of metal lithium negative electrode and application

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1, Preparation of Lithium Phosphate SEI Film on Metal Lithium Negative Electrode Surface

[0034] In a high-purity argon atmosphere, immerse the polished lithium sheet in a DMSO treatment solution containing 0.04M phosphoric acid and react for 2 minutes at a reaction temperature of 25°C. After the lithium sheet is taken out, the excess treatment solution on the surface can be wiped off to obtain the present invention. Metal lithium anode containing lithium phosphate SEI film.

[0035] The morphology and structure of lithium phosphate SEI films were observed by cold field emission scanning electron microscopy (SEM). It can be seen that the surface is rough, and EDXMapping shows that P, O, and C elements are evenly distributed on the surface of the lithium negative electrode. It can be seen from the cross-sectional view of the SEM that the thickness of the lithium phosphate SEI film is about 150 nm. XPS proves that its surface is lithium phosphate and a small am...

Embodiment 2

[0036] Example 2, Preparation of Lithium Phosphate SEI Film on Metal Lithium Negative Electrode Surface

[0037] Other conditions are the same as in Example 1, except that the concentration of the phosphoric acid treatment solution is changed to 0.1M. The morphology and structure of the lithium phosphate SEI film were observed by SEM. It can be seen that the surface is relatively smooth, but the cracking phenomenon is relatively serious. EDXMapping shows that P, O, and C elements are evenly distributed on the surface of the lithium negative electrode. It can be seen from the cross-sectional view of the SEM that the thickness of the lithium phosphate SEI film is about 500 nm. XPS proves that its surface is lithium phosphate and a small amount of organic matter.

Embodiment 3

[0038] Example 3, Preparation of Lithium Phosphate SEI Film on Metal Lithium Negative Electrode Surface

[0039]Other conditions are the same as in Example 1, except that the concentration of the phosphoric acid treatment solution is changed to 0.005M. The morphology and structure of the lithium phosphate SEI film were observed by SEM. It can be seen that the surface is still rough, and EDXMapping shows that P, O, and C elements are evenly distributed on the surface of the lithium negative electrode. It can be seen from the cross-sectional view of the SEM that the thickness of the lithium phosphate SEI film is about 20 nm. XPS proves that its surface is lithium phosphate and a small amount of organic matter.

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Abstract

The invention discloses a surface in-situ processing method of a metal lithium negative electrode. And such metal lithium subjected to in-situ processing can be applicable for a high-performance metal lithium secondary battery. According to the surface in-situ processing method of the metal lithium negative electrode, provided by the invention, a processing liquid containing a few amount of phosphoric acid matters reacts with metal lithium and a passivation layer on the surface of the metal lithium to generate an interface protection layer taking lithium phosphate as a center. The in-situ processing technology has the advantages of simplicity in method, easiness in regulation and control and high practical degree; and the metal lithium negative electrode subjected to in-situ processing is used in the metal lithium secondary battery, the energy density and the cycle performance of the current battery can be substantially improved, and high practical value is achieved.

Description

technical field [0001] The invention relates to an in-situ treatment method and application of the surface of a metal lithium negative electrode. Background technique [0002] With the development of new energy technologies, advanced energy storage devices with high specific energy have received more and more attention. However, existing lithium-ion secondary batteries cannot meet the specific energy requirements of advanced energy storage devices. Lithium metal has a high specific capacity (3860mAh / g) and the lowest potential (-3.04Vs standard hydrogen electrode). Therefore, the metal lithium secondary battery using metal lithium as the negative electrode has the characteristics of high operating voltage and large specific energy. Lithium metal secondary batteries include lithium-sulfur batteries, lithium-air batteries, lithium intercalation compound batteries, lithium oxide batteries, etc., which are the hotspots of high energy density secondary battery research today. ...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/36H01M10/0525
CPCH01M4/1395H01M4/366H01M10/0525Y02E60/10
Inventor 郭玉国李念武殷雅侠
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD
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