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A kind of method and application thereof to lithium metal polishing

A technology of lithium metal and lithium metal electrodes, which is applied in the coating process of metal materials, lithium batteries, structural parts, etc., can solve the continuous side reactions between lithium dendrites and organic electrolytes, uncontrollable growth of lithium dendrites, low cycle life, etc. problems, to achieve excellent electrochemical performance, excellent electrochemical performance, reliable and practical performance

Active Publication Date: 2022-04-29
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention addresses the problem of low cycle life caused by dendrite growth in the current lithium metal anode, and the inhomogeneity of the original natural layer will lead to the formation of an uneven SEI layer, which hinders uniform lithium nucleation and leads to uncontrollable lithium dendrites The growth of lithium dendrites and the problem of continuous side reactions between the organic electrolyte

Method used

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  • A kind of method and application thereof to lithium metal polishing
  • A kind of method and application thereof to lithium metal polishing
  • A kind of method and application thereof to lithium metal polishing

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0059] Under the high-purity argon atmosphere in the glove box, the lithium foil was soaked in SnCl 4 -DME mixed solution (in this mixed solution, SnCl 4 The volume ratio of DME and DME is 1:99), take it out after soaking for 5 minutes, evaporate naturally, then put lithium metal into an airtight container and use an oscillator for low-frequency oscillation, the frequency is 200Hz, the original layer on the surface of lithium metal can be peeled off, The lithium metal wrapped by the Sn-LiCl mixed protective layer was obtained. The schematic diagram of the polishing reaction is shown in figure 1 As shown, Sn exists in the structure of nanospheres, and the main component of the edge and periphery, as well as the places where the particles are in contact, is LiCl.

[0060] Using a commercial ternary cathode (NCM811), the electrolyte uses 1mol / L LiTFSI, and the loading capacity of the cathode material is about 26mg cm -2 , matching the prepared lithium metal, cycled at a charge...

example 2

[0062] Under an inert atmosphere in a glove box, soak Li metal in SnF 2 -THF mixed solution (in this mixed solution, SnF 2 The volume ratio of THF and THF is 1:99), soaked for 5 minutes, took it out, evaporated to dryness naturally, and then put lithium metal into an airtight container for low-frequency vibration at a frequency of 130 Hz, the original layer on the surface of lithium metal was peeled off, and Sn - Lithium metal wrapped in a LiF hybrid protective layer. The SEM image of the original oxide layer on the lithium metal surface obtained figure 2 shown.

[0063] Using the same method and test conditions as in Example 1, record the number of cycles to keep more than 80% of the capacity (see Table 1).

example 3

[0065] Under an inert atmosphere in a glove box, immerse lithium metal in TiCl 4 -THF mixed solution (in this mixed solution, TiCl 4 The volume ratio of THF and THF is 1:99), take it out after soaking for 5 minutes, heat and bake the lithium metal (50°C), and then put the lithium metal into an airtight container for low-frequency oscillation, the frequency is 85Hz, the original surface of the lithium metal The layer is peeled off, and the lithium metal wrapped by the Ti-LiCl mixed protective layer is obtained. The SEM image of the newly formed Ti-LiCl protective layer on the surface of lithium metal is shown in image 3 .

[0066]Using the same method and test conditions as in Example 1, record the number of cycles to keep more than 80% of the capacity (see Table 1).

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Abstract

The invention discloses a method for polishing lithium metal. The method comprises: soaking lithium metal in a solution containing a halogen salt, drying and polishing; the chemical formula of the halogen salt is MX a , wherein, a is the amount of X required to meet the valence balance of the elements, the M includes any one or a combination of at least two of Sn, Ti or Ge, and the X includes F, Cl, Br or I Any one or a combination of at least two. The invention provides a low-cost method for polishing lithium metal at room temperature, which can not only remove the uneven natural layer formed on the lithium foil, but also form an artificial SEI passivation layer to improve the cycle performance of lithium metal.

Description

technical field [0001] The present invention relates to the field of battery technology, and relates to a method for polishing lithium metal and its application, in particular to a method for polishing lithium metal, the use of which to prepare a lithium metal electrode with an SEI passivation layer, and the obtained lithium metal electrode with an SEI passivation layer. Lithium metal electrode with SEI passivation layer. Background technique [0002] The rapid development of small mobile terminals and electric vehicles has put forward new requirements for the relatively low energy density of traditional lithium-ion batteries, while high-energy-density rechargeable lithium metal batteries such as lithium-sulfur batteries and lithium-air batteries use metallic lithium as the Negative electrode material, due to its extremely high theoretical specific capacity (3860mAh / g), low potential (-0.304V vs. SHE) and very small density (0.53g / cm 3 ), making rechargeable lithium metal b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1395H01M10/052C23C18/54C23C22/05
CPCH01M4/1395H01M10/052C23C22/05C23C18/54Y02E60/10
Inventor 李峥冯玉川何泓材杨帆
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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