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A lithium metal battery with a curved lithium sheet negative electrode

A lithium metal battery, curved surface technology, applied in the direction of lithium battery, negative electrode, battery electrode, etc., can solve the problems of reducing cycle efficiency and service life, low coulombic efficiency of lithium battery, lithium metal powder or dendrite, etc. Large effective surface area, enhanced electrochemical reaction kinetics, and the effect of preventing cracking

Active Publication Date: 2022-05-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the lithium metal batteries in the prior art have the following technical problems: lithium metal powdering or dendrites are prone to occur, which in turn causes low Coulombic efficiency and battery capacity reduction of lithium batteries, reducing cycle efficiency and service life

Method used

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  • A lithium metal battery with a curved lithium sheet negative electrode
  • A lithium metal battery with a curved lithium sheet negative electrode
  • A lithium metal battery with a curved lithium sheet negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] like figure 1 As shown, a lithium metal battery with a curved lithium sheet negative electrode includes a battery case 2, a diaphragm 6 is arranged inside the battery case 2, and the two ends of the diaphragm 6 are respectively connected to the middle of the battery case 2, and the diaphragm 6 and the battery case 2 There is a first cavity between one end, a second cavity is set between the diaphragm 6 and the other end of the battery case 2, and an electrode piece 1 is arranged in the first cavity, and the electrode piece 1 abuts against the battery case 2 One end, the second cavity is provided with a battery negative pole 5, the two ends of the battery negative pole 5 are respectively abutted against the diaphragm 6 and the other end of the battery case 2, the battery negative pole 5 is made of a curved lithium sheet, the first cavity and the second cavity The cavity is filled with electrolyte solution 7 , and the electrode piece 1 and the negative electrode 5 of the ...

Embodiment 2

[0051] The difference between this embodiment and Embodiment 1 is that the electrode sheet 1 is made of a curved lithium sheet. That is, both the electrode sheet 1 and the negative electrode 5 of the lithium symmetric battery are made of curved lithium sheets.

[0052] The constant current cycle performance test of the lithium symmetric battery of this embodiment was carried out by using the LAND CT2001A battery test system.

[0053] from image 3 It can be seen that both the electrode sheet 1 and the negative electrode 5 of the battery adopt a lithium symmetric battery with a curved surface lithium sheet at 3mA / cm 2 current density, 1mAh / cm 2 After cycling for about 900,000 seconds under the deposition capacity, the polarization voltage is only 0.16V. Under the same conditions, the polarization voltage of the lithium symmetric battery based on the planar lithium sheet has reached 0.16V after about 340,000 seconds of cycling. In the subsequent cycles, the polarization volta...

Embodiment 3

[0056] The preparation method of the curved lithium sheet is to make the planar lithium sheet with a curved surface by embossing and rolling.

[0057] Optionally, the preparation method of the curved lithium sheet comprises the following steps,

[0058] Prepare a curved surface mold in the shape of the required curved surface lithium sheet; spread the polypropylene film and the curved surface mold on the surface of the flat lithium sheet in sequence, and clamp the curved surface mold, polypropylene film and flat lithium sheet with a clamp; press the curved surface mold with a pressure device, Make the planar lithium sheet form the same curved surface as the curved surface mold; take out the curved surface mold and the polypropylene film to obtain the required curved surface lithium sheet.

[0059] Specifically, a layer of polypropylene film was spread on the surface of the flat lithium sheet, and placed in the center of the jaws of the precision drilling jig, and then the curv...

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Abstract

The invention relates to a lithium metal battery with a curved lithium sheet negative electrode. A cavity, a second cavity is provided between the diaphragm and the other end of the battery case, an electrode sheet is provided in the first cavity, and the electrode sheet abuts against one end of the battery case, a battery negative electrode is provided in the second cavity, and the battery The two ends of the negative electrode are respectively in contact with the diaphragm and the other end of the battery case. The negative electrode of the battery is made of a curved lithium sheet. Both the first cavity and the second cavity are filled with electrolyte, and the electrode sheet and the negative electrode of the battery are respectively soaked in the electrolyte. . The curved lithium sheet extends the area of ​​the SEI film of the negative electrode of the battery, effectively reducing the growth of dendrites, and the SEI film is not easy to break. It can always maintain the electrolyte infiltration, enhance the electrochemical reaction kinetics, increase the migration path of lithium ions, help maintain the battery capacity and cycle efficiency of lithium metal batteries, and prolong the service life.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium metal battery with a curved lithium sheet negative electrode. Background technique [0002] The fields of consumer electronics, new energy vehicles, and energy storage have put forward higher and higher requirements for the capacity, life and safety of lithium batteries. The demand for lithium batteries with high capacity, long life and high safety is extremely urgent. . [0003] At present, metallic lithium is considered to be the optimal solution for lithium secondary batteries due to its high theoretical specific capacity (3860mAh / g) and the most negative electronegativity among all metals. Therefore, lithium metal batteries have been widely used in various fields. [0004] However, the lithium metal batteries in the prior art have the following technical problems: Lithium metal powdering or dendrites are prone to occur, which in turn causes low Coulombic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M10/052H01M10/058
CPCH01M4/134H01M10/052H01M10/058H01M2004/027H01M2004/025Y02P70/50Y02E60/10
Inventor 袁伟王淳陈明月高欣竹王程
Owner SOUTH CHINA UNIV OF TECH
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