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Protection method of lithium metal electrode

A lithium metal electrode, metal lithium technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of complex interface nano-modification process, limited to laboratory stage, no industrialization basis, etc., to improve the overall Effects of life and quality, improved stability and safety performance, improved cycle performance and safety performance

Active Publication Date: 2019-07-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The interface nano-modification process is complex, limited to the laboratory stage, and has no industrial basis
Linda F.Nazar found that the use of noble metal indium to form a layer of lithium fluoride and alloys on the surface of lithium can effectively suppress the formation of lithium dendrites, which can significantly improve the stability of lithium batteries, but the cost is high and not economical.

Method used

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  • Protection method of lithium metal electrode
  • Protection method of lithium metal electrode
  • Protection method of lithium metal electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this example, see Figure 1 ~ Figure 3 , a kind of protection method of lithium metal electrode, comprises the steps:

[0036] a. Weigh 53.6 mg of antimony trifluoride, pour it into a 20 milliliter glass bottle with a cap, and add 3 milliliters of propylene carbonate as a solvent with a pipette gun, stir to fully dissolve antimony trifluoride in propylene carbonate, Obtain antimony trifluoride solution for subsequent use;

[0037]b. Take a lithium sheet with a diameter of 15.6 mm, press it into a sheet with a thickness of 0.2 mm with a smooth cylinder, and then cut it into a disc with a diameter of 12 mm with a die, and set it aside;

[0038] c. pressing the lithium sheet in b on the stainless steel gasket, so that the lithium sheet and the stainless steel gasket are fully adhered and bonded;

[0039] d. put the lithium sheet processed in the c into the glass bottle used in the step a together with the stainless steel gasket, make the lithium sheet immersed in the ...

Embodiment 2

[0044] This embodiment is basically the same as Embodiment 1, especially in that:

[0045] In this example, see Figure 4 , a kind of protection method of lithium metal electrode, comprises the steps:

[0046] a. Weigh 107.2 mg of antimony trifluoride, pour it into a 20 milliliter glass bottle with a cap, and add 6 milliliters of propylene carbonate as a solvent with a pipette gun, stir to fully dissolve antimony trifluoride in propylene carbonate, Obtain antimony trifluoride solution for subsequent use;

[0047] b. Take a lithium sheet with a diameter of 15.6 mm, press it into a sheet with a thickness of 0.2 mm with a smooth cylinder, and then cut it into a disc with a diameter of 12 mm with a die, and set it aside;

[0048] c. pressing the lithium sheet in b on the stainless steel gasket, so that the lithium sheet and the stainless steel gasket are fully adhered and bonded;

[0049] d. put the lithium sheet processed in the c into the glass bottle used in the step a toget...

Embodiment 3

[0054] This embodiment is basically the same as the previous embodiment, and the special features are:

[0055] In this example, see Figure 5 , a kind of protection method of lithium metal electrode, comprises the steps:

[0056] a. Weigh 53.6 mg of antimony trifluoride, pour it into a 20 milliliter glass bottle with a cap, and add 3 milliliters of propylene carbonate as a solvent with a pipette gun, stir to fully dissolve antimony trifluoride in propylene carbonate, Obtain antimony trifluoride solution for subsequent use;

[0057] b. Take a lithium sheet with a diameter of 15.6 mm, press it into a sheet with a thickness of 0.2 mm with a smooth cylinder, and then cut it into a disc with a diameter of 12 mm with a die, and set it aside;

[0058] c. pressing the lithium sheet in b on the stainless steel gasket, so that the lithium sheet and the stainless steel gasket are fully adhered and bonded;

[0059] d. put the lithium sheet processed in the c into the glass bottle used...

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Abstract

The invention discloses a protection method of a lithium metal electrode. By use of a simple alloyage method, antimony trifluoride is utilized to form an artificial protective film on the surface of alithium cathode, so that polarization of the lithium cathode can be effectively lowered, and generation of dendritic crystals can be suppressed. According to the method, antimony trifluoride and lithium are mainly utilized for a reaction to generate the dense artificial protective film, wherein antimony trifluoride is dissolved in propylene carbonate to prepare a uniform solution first, pretreatment is performed on the surface of a lithium wafer to remove oxidized lithium on the surface, the lithium wafer is cut into a round wafer, the round wafer is immersed in the antimony trifluoride solution for a reaction to obtain a treated lithium electrode, and finally a symmetric battery is obtained through assembling. Through a low-concentration long-time reaction, a dense alloy layer can be generated on the surface of lithium metal. Through the method, the polarization of the lithium metal cathode is fully lowered, circulation stability is good, generation of lithium dendritic crystals is effectively suppressed, and the stable lithium metal cathode is obtained; and when the lithium metal cathode is applied to a lithium battery, the circulation performance and safety performance of the lithium battery can be improved, and potential commercial application value is obtained.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery, in particular to a preparation method and a maintenance method of an electrode of the lithium ion battery, and is applied in the technical field of lithium ion batteries. Background technique [0002] In recent years, the continuous consumption of fossil energy and the resulting environmental pollution have attracted increasing attention. In order to alleviate the above problems, the development and effective utilization of renewable clean energy such as solar energy and wind energy, which can replace traditional energy sources such as coal, oil, and natural gas, has become an important research topic, and the development momentum of the new energy industry is becoming increasingly strong. However, new energy sources such as solar and wind energy are intermittent and cannot provide a continuous and stable energy supply to the grid. Due to the advantages of high energy density and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525
CPCH01M4/382H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 张远俊吴超王官耀张英张霖黄中依朱南河
Owner SHANGHAI UNIV
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