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Lithium negative electrode coated with LiF film as well as preparation method and application of lithium negative electrode

A technology of lithium negative electrode and thin film, which is applied in the field of lithium negative electrode coated with LiF thin film and its preparation, can solve the problems of high physiological toxicity, high price of fluorinated reagents, degradation of mechanical properties and electronic conductivity, etc., and achieve improvement of interface characteristics, raw materials Inexpensive, promotes uniform deposition effect

Inactive Publication Date: 2021-03-30
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Therefore, there are problems in the process of fluorination of lithium metal, such as: the decline of mechanical properties and additional electronic conductivity caused by the introduction of impurities, the high price of fluorinating reagents, high physiological toxicity and the The corrosiveness of the container, complex experimental operations, and fine control of experimental parameters make the fluorination of lithium negative electrodes full of challenges. In addition, a method for surface modification of lithium metal with simple preparation method and low cost is proposed, which has become a new method for lithium metal batteries. A subject of much concern in the industry

Method used

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  • Lithium negative electrode coated with LiF film as well as preparation method and application of lithium negative electrode
  • Lithium negative electrode coated with LiF film as well as preparation method and application of lithium negative electrode
  • Lithium negative electrode coated with LiF film as well as preparation method and application of lithium negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Five ml of triethylamine trihydrofluoric acid is dissolved in 50 mL of tetrahydrofuran under a sealing condition, poured into the polytetrafluoroethylene reaction kettle, preheated at 35 ° C for 15 min, and salivate trihydrofluoric acid Tetrahydrofuran solution;

[0035] 2. Under the inert atmosphere, the polished pure lithium metal sheet is placed in a tetrahydrofuran solution of triethylamine trihydrofluoric acid, and the polytetrafluoroethylene reactor reaction is 2 h; then after the solvent is washed with tetrahydrofuran, drying at 100 ° C 1H, the lithium negative electrode of the LIF film was obtained.

[0036] The resulting two lithium negative components of the two coated LIF films were partyed as symmetrical. The lithium negative electrode and commercial lithium negative electrode of the obtained coated LIF film is loaded into a metal lithium half cell. Press the assembled symmetrical battery to 5mAH. cm -2 The capacity density is 5 mA. cm -2 The current density ...

Embodiment 2

[0039] 1. 5 ml of pyridine hydrogenide is dissolved in 50 mL of tetrahydrofuran and poured into the polytetrafluoride reaction kettle, 45 ° C for 10 min.

[0040] 2. Under an inert atmosphere, the foam-composite metal lithium is placed in the fluorinated reagent obtained from S1, and the reaction 2H is reacted at the polytetrafluoroethylene reactor;

[0041] 3. After cleaning the lithium tetrahydrofuran of the reaction, drying at 100 ° C for 1 h to prepare a lithium negative electrode coating the LIF film.

[0042] 4. Filled the resulting lithium sheet into a symmetrical battery and assembles the resulting lithium sheet into a metal lithium half cell.

[0043] Figure 4 A scanning electron micrograph of the lithium negative electrode surface of the LIF film is included in Example 2. From image 3 It can be seen that the surface of the LIF film is flat, uniform and dense, and some granular projections are due to excessive growth of LIF.

Embodiment 3

[0045] 1. In the inert atmosphere of sealing conditions, 100 mg of difluoromethanesulfonyl chloride is dissolved in 50 mL of tetrahydrofuran and poured into the polytetrafluoroethylene reaction kettle, preheating at 55 ° C for 15 min;

[0046] 2. Under an inert atmosphere, a metal lithium compound compound compound is placed in the fluorinated agent obtained from S1, and the reaction is 2 h;

[0047] 3. After tetrahydrofuran with tetrahydrofuran, dried at 100 ° C for 1 h to prepare a lithium negative electrode of the LIF film.

[0048] The lithium negative electrode assembly of the obtained coated LIF film was subjected to a symmetrical battery, and the lithium negative electrode and commercial lithium negative electrode of the obtained LIF film were assembled into a metal lithium half cell. Figure 5 A scanning electron microscope photograph of the lithium negative surface of the LIF film is held in Example 3. From Figure 4 It can be seen that the LIF block particles are closely...

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Abstract

The invention belongs to the technical field of lithium metal interface modification, and discloses a lithium negative electrode coated with a LiF film as well as a preparation method and applicationof the lithium negative electrode. The lithium negative electrode coated with the LiF film is prepared by the following steps: dissolving a fluorinating agent in a polar aprotic organic solvent, and preheating at 25-300 DEG C in an inert atmosphere under a sealed condition to prepare a fluorinating agent solution; putting the polished lithium sheet into a fluorinating agent solution, and reactingat 25-300 DEG C in an inert atmosphere; and cleaning with an organic solution, and drying at 50-150 DEG C to obtain the product. The fluorinating agent is used for fluorinating the lithium negative electrode, the LiF film is generated on the surface of the lithium negative electrode in situ, surface impurities are removed by the organic solvent after the reaction is finished to obtain the compactlithium negative electrode coated with the LiF film, and the LiF film effectively improves the interface characteristic of the lithium negative electrode, and inhibits the generation of lithium dendrites. And the coulombic efficiency and the cycling stability of the lithium negative electrode in the charging and discharging process are improved.

Description

Technical field [0001] The present invention belongs to the field modification technique in lithium metal interface, and more particularly to a lithium negative electrode and a preparation method thereof of the LIF film. Background technique [0002] Lithium metal is considered to be an ideal negative electrode of the next generation of lithium metal batteries. However, the growth of lithium delegthtrium crystals and low roaming efficiency is the main obstacle to its actual application in lithium metal batteries. The interface engineering of lithium metal and electrolytes is the key to improving lithium ion kinetic and interface stability is the key to overcoming the above problems. Since the lithium ion has a high diffusion rate and a lower transport energy barrier, the LIF is widely considered to be a primary chemical component that promotes lithium uniform deposition behavior in the SEI film. At present, due to the problem of lithium bolt cells, the growth of lithium battery i...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/134H01M4/1395H01M10/052H01M10/42
CPCH01M4/134H01M4/1395H01M4/628H01M10/052H01M10/4235Y02E60/10
Inventor 陈锦标程乙峰施志聪
Owner GUANGDONG UNIV OF TECH
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