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A copper current collector for lithium metal battery and its surface modification method and application

A lithium metal battery and surface modification technology, applied in lithium batteries, battery electrodes, metal material coating processes, etc., can solve problems such as reducing battery coulomb efficiency and cycle life, hindering large-scale practical applications, and achieving excellent environmental resistance. Corrosion performance, excellent resistance to dissimilar intermetallic galvanic corrosion, and the effect of good capacity retention

Active Publication Date: 2022-05-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above factors will reduce the Coulombic efficiency and cycle life of the battery during cycling, hindering its large-scale practical application.

Method used

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  • A copper current collector for lithium metal battery and its surface modification method and application
  • A copper current collector for lithium metal battery and its surface modification method and application
  • A copper current collector for lithium metal battery and its surface modification method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0045] MPTS is selected as the modified material. Mix MPTS and absolute ethanol at a volume ratio of 1:4, stir at a speed of 300r / min for about 10 minutes to mix evenly; drop it onto the prepared copper sheet in the air, and add two drops with a dropper; After 1 hour, put it into 0.1mol / L hydrochloric acid solution for hydrolysis for 1 hour; after hydrolysis, put it into a vacuum drying oven at 30°C and dry for 3 hours to obtain a copper current collector modified by coating.

[0046] The modified copper current collector was assembled into a battery for lithium battery performance testing. In order to characterize the surface morphology of the film layer, the MPTS-Cu was characterized by SEM, and the elemental analysis was carried out on the surface of the MPTS-Cu, as shown in figure 1 As shown, the existence of the surface modification layer is proved; X-ray diffraction analysis is carried out on the sample, as shown in figure 2 As shown, the diffraction peaks of the hydr...

Embodiment 2

[0048] MPTS is selected as the modified material. Mix MPTS and absolute ethanol at a volume ratio of 1:4, stir at a speed of 300r / min for about 10 minutes to mix evenly; drop it onto the prepared copper sheet in the air, and add two drops with a dropper; After 1 hour, put it into 0.1mol / L hydrochloric acid solution for hydrolysis for 1 hour; after hydrolysis, put it into a vacuum drying oven at 30°C and dry for 3 hours to obtain a copper current collector modified by coating.

[0049] Put the prepared MPTS-Cu current collector into 0.1mol / L sodium chloride solution, such as Image 6 shown, according to Image 6 It can be seen from the characterization and test results that MPTS-Cu has excellent resistance to chloride ion environment corrosion.

Embodiment 3

[0051] MPTS is selected as the modified material. Mix MPTS and absolute ethanol at a volume ratio of 1:4, stir at a speed of 300r / min for about 10 minutes to mix evenly; drop it onto the prepared copper sheet in the air, and add two drops with a dropper; After 1 hour, put it into 0.1mol / L hydrochloric acid solution for hydrolysis for 1 hour; after hydrolysis, put it into a vacuum drying oven at 30°C and dry for 3 hours to obtain a copper current collector modified by coating.

[0052] The prepared samples were assembled into batteries, the deposition morphology was observed, and the galvanic corrosion current was analyzed by ZRA technology, such as Figure 7 As shown, the deposited lithium surface is complete without corrosion pits. It can be seen that MPTS-Cu can passivate the copper surface so as to well inhibit the galvanic corrosion between heterogeneous metals; After standing for a period of time, the voltage-capacity curve shows that the capacity loss of the MPTS-Cu ass...

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Abstract

The invention provides a method for modifying the surface of a copper current collector for a lithium metal battery, comprising the following steps: selecting an organosiloxane with a -SH functional group, and uniformly mixing it with a certain amount of absolute ethanol; The mixed solution was added dropwise on the prepared copper sheet and dried naturally to form a film; the copper sheet was put into an acid solution for hydrolysis, so that the film layer on the surface of the copper sheet self-assembled into a Si‑O‑Si network structure; vacuum drying obtained Coating modified copper current collector. The copper current collector surface modification method for lithium metal batteries provided by the present invention forms a layer of Si-O-Si network structure by self-assembly modification on the surface of copper current collectors, which can improve the electrochemical performance of lithium metal batteries; and due to the film layer The passivation effect on the surface of the copper current collector makes the modified current collector have excellent environmental corrosion resistance and galvanic corrosion resistance between heterogeneous metals. The invention also provides a copper current collector for lithium metal batteries and its application in negative electrode materials for lithium metal batteries.

Description

technical field [0001] The invention relates to the technical field of energy storage batteries, in particular to a copper current collector for a lithium metal battery and a surface modification method and application thereof. Background technique [0002] With the continuous progress and development of society, the human demand for energy is also increasing. At present, the continuous excessive consumption of fossil energy such as coal, oil, and natural gas has brought serious environmental pollution problems. Some environmentally friendly clean energy such as wind energy, solar energy, tidal energy, etc. have been developed and utilized. However, these renewable energy sources cannot be directly utilized, and most of them have the disadvantages of intermittency and volatility. To address this shortcoming, it is necessary to develop reliable electrochemical energy storage devices. At present, the negative electrode material generally used in lithium-ion batteries is gra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M10/052C23C22/52
CPCH01M4/667H01M4/661H01M10/052C23C22/52Y02E60/10
Inventor 陈根温祖鑫刘小鹤章瑜方文强
Owner CENT SOUTH UNIV