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Preparation method and application of metal current collector with micro-pit array

A technology of micro-pit array and current collector, which is applied in the direction of final product manufacturing, sustainable manufacturing/processing, electrode carrier/current collector, etc., can solve the problems such as the lack of research on the stress effect of mechanical means and the ambiguous design of micro-pit array parameters. Achieve large-scale production and application, simple and convenient processing methods, and good repeatability

Pending Publication Date: 2022-07-05
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the parameter design of the micropit array on the current collector is vague, and there are few studies on the stress effect introduced by mechanical means on the current collector.

Method used

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  • Preparation method and application of metal current collector with micro-pit array
  • Preparation method and application of metal current collector with micro-pit array
  • Preparation method and application of metal current collector with micro-pit array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method and application of a metal current collector with a micropit array, comprising the following steps:

[0026] (1) Use a battery slicer to punch a copper current collector with a thickness of 50 μm into a disc with a diameter of 12 mm, and then use acetone and anhydrous ethanol to ultrasonically clean the copper foil to remove surface contamination;

[0027] (2) Place the dried copper current collector substrate on the sample stage of the microhardness tester, and use a regular quadrangular pyramid indenter for mechanical indentation. The length of the bottom surface of the indenter is 140 μm and the height is about 20 μm; The load was 500 gf, and the array spacing was controlled to be 0.6 mm, and a copper current collector with a 10*10 micro-pit array pattern was pressed. A schematic diagram of a copper current collector with a micropit array pattern is shown in figure 1 As shown in (a), 1 is the copper current collector, 2 is the micro-pit on the c...

Embodiment 2

[0033] The basic steps are the same as in Example 1, the difference is:

[0034] In step (2), the press-in load is set to 300 gf, and a copper current collector with a micro-pit array pattern is pressed.

[0035] Taking the copper current collector with the micro-pit array pattern prepared above or the original copper current collector as the positive electrode, 1MLiTFSI+DOL / DME+2%LiNO 3 As the electrolyte, Celgard2400 with a diameter of 16 mm as the diaphragm, and a lithium sheet with a diameter of 12 mm as the negative electrode, a CR2032 button half-cell was assembled in an argon gas glove box, in which the volume ratio of DOL and DME was 1:1.

[0036] After standing for 12h, the Coulomb efficiency of the half-cell was tested by the Xinwei battery test system, and the current density was 1.0mA cm -2 , the charge-discharge depth is 1.0mAh cm -2 . like Image 6 As shown, compared with the pristine copper current collector, the copper current collector with the micropit ar...

Embodiment 3

[0038] The basic steps are the same as in Example 1, the difference is:

[0039] In step (2), the array spacing is controlled to be 1.0 mm, and a copper current collector with a micro-pit array pattern is pressed.

[0040] Taking the copper current collector with the micro-pit array pattern prepared above or the original copper current collector as the positive electrode, 1MLiTFSI+DOL / DME+2%LiNO 3 As the electrolyte, Celgard2400 with a diameter of 16 mm as the diaphragm, and a lithium sheet with a diameter of 12 mm as the negative electrode, a CR2032 button half-cell was assembled in an argon gas glove box, in which the volume ratio of DOL and DME was 1:1.

[0041] After standing for 12 hours, the Coulombic efficiency of the half-cell was tested by the Xinwei battery test system, and the current density was 2.0 mA cm -2 , the charge-discharge depth is 1.0mAh cm -2 . like Figure 7 As shown, at high current density, the copper current collector of the micropit array pattern...

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Abstract

The invention discloses a preparation method and application of a metal current collector with a micro-pit array, and the preparation method comprises the steps: applying pressure to the surface of the current collector to form micro-pits, arranging a plurality of micro-pits at intervals to form a micro-pit array, and enabling the distance between every two micro-pits to be 0.3-1.5 mm; and the depth of the micro pits is 10 to 100 microns. The micro-pit array constructed by the invention has higher lithium affinity, so that electro-deposited lithium preferentially and transversely grows in pits; and residual stress is introduced to the outer surfaces of the pits between the arrays to induce uniform and dense deposition of lithium metal, so that the risk of short circuit in the battery is reduced, and the cycle performance of the battery is effectively improved. The invention provides a new surface modification means for the metal current collector, and has a wide application prospect in the field of lithium metal batteries.

Description

technical field [0001] The invention relates to a surface modification method and application of a metal current collector, in particular to a preparation method and application of a metal current collector with a micro-pit array. Background technique [0002] Traditional lithium-ion batteries rely on Li + The deintercalation reaction of the positive and negative electrodes realizes the cycle, and the limitation of the inherent capacity has been unable to meet the current demand for high energy density, portable energy storage devices. With its ultra-high theoretical specific capacity (3860mAh g-1) and extremely low electrochemical potential (-3.040V vs standard hydrogen electrode), lithium metal is regarded as the most ideal anode material for high specific energy batteries, and it is once again popular. wide attention. However, the lithium metal anode has the problems of volume expansion and dendrite growth, which reduces the Coulombic efficiency, and may even lead to sh...

Claims

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Application Information

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IPC IPC(8): H01M4/70H01M4/66H01M4/134H01M10/052
CPCH01M4/70H01M4/661H01M4/134H01M10/052Y02P70/50
Inventor 陈坚刘昌风毛欣宇
Owner SOUTHEAST UNIV
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