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Columnar copper array current collector and preparation method and application thereof

A current collector and array technology, which is applied in the field of columnar copper array current collectors and its preparation, can solve the problem that the gaps in the holes are difficult to be fully utilized, and achieve the effects of easy large-scale processing, short time consumption, and good safety performance

Pending Publication Date: 2022-02-25
CHINA THREE GORGES CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, when it is used as the current collector of the lithium metal negative electrode, the lithium metal will be preferentially deposited at the pores, and the gaps in the pores will be difficult to be fully utilized.

Method used

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  • Columnar copper array current collector and preparation method and application thereof
  • Columnar copper array current collector and preparation method and application thereof
  • Columnar copper array current collector and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation of copper microrod array current collector, concrete steps are:

[0041] S1. Ultrasonic cleaning of 400 μm thick copper foil with deionized water to remove surface impurities;

[0042] S2. Conduct femtosecond laser processing experiments in an air environment; the copper foil is processed by a femtosecond pulse laser machine with a pulse width of 800fs and a wavelength of 532nm. The frequency is 200kHz, the power is 8w, the scanning interval is 40μm, and the scanning speed is 30mm / s;

[0043] S3, putting the copper foil treated in S2 into 1mol / L hydrochloric acid solution for 6 hours, removing the oxide layer on the surface, and cleaning the copper foil with deionized water and absolute ethanol successively;

[0044] Through the above treatment, the copper microrod array current collector is obtained. Its scanning electron microscope pictures are as figure 2 As shown, their structural features at the micrometer scale and submicrometer scale are show...

Embodiment 2

[0054] With the copper microrod array current collector that makes in embodiment 1 as lithium metal negative electrode current collector, with the LiTFSI / LiNO that dissolves in DME / DOL 3 As the electrolyte, a button cell was assembled with lithium metal as the counter electrode and the charge and discharge test was carried out. After 1mAh / cm respectively 2 、4mAh / cm 2 After the lithium metal is deposited, its scanning electron microscope picture is as follows Figure 5 As shown, lithium metal is deposited between the pillars in the form of bulk, without the formation of lithium dendrites. The first Coulombic efficiencies of the battery are 81.1% and 93.6%, respectively, considering that the design capacity of the current collector is 5mAh / cm 2 , it can be seen that the matching degree between the actual capacity and the design capacity significantly affects its first Coulombic efficiency. When the area specific capacity is 4mAh / cm 2 , the battery can perform more than 80 s...

Embodiment 3

[0058] A layer of nanoscale Au was plated on the surface of the same copper array current collector as in Example 1, and the same battery assembly and electrochemical tests were performed. The first Coulombic efficiency of the battery can be further improved, up to 97.4%. Compared with the copper microrod array current collector, the overpotential of charge and discharge after gold plating can be reduced from 50mV to 20mV, such as Figure 8 shown.

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Abstract

The invention provides a columnar copper array current collector and a preparation method and application thereof. The copper array current collector has a regular columnar array structure on a micron scale; on the submicron scale, irregular net-shaped protruding structures are arranged and are evenly distributed on the surface of the columnar body. The preparation method specifically comprises the following steps that S1, a copper foil is cleaned to remove surface impurities; S2, the copper foil is treated with femtosecond laser; and S3, the copper foil treated in the S2 is put into a hydrochloric acid solution, and CuOx on the surface is removed. Through the treatment, the columnar copper array current collector is obtained. The specific surface area of the current collector is obviously increased, and the current collector is used for a battery negative electrode material and has more stable cycle performance and better safety performance.

Description

technical field [0001] The invention belongs to the technical field of compound fertilizer production, and in particular relates to a columnar copper array collector and its preparation method and application. Background technique [0002] The negative electrode current collector of commercial lithium-ion batteries is copper foil with rough surface, and the negative electrode is mainly graphite. The characteristic of this negative electrode material is that the charge and discharge volume expansion is small, about 10%, and the cycle is stable, but the theoretical specific capacity is low, only 372mAh / g. In order to develop the next generation of high-capacity lithium-ion batteries, it is necessary to adopt anode materials with higher theoretical specific capacities, such as lithium metal anodes, silicon anodes, and transition metal oxide anodes. The theoretical specific capacities at room temperature are 3860mAh / g, 3590mAh / g, 400-1300mAh / g. However, there are many problem...

Claims

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Application Information

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IPC IPC(8): H01M4/70H01M4/66H01M4/36
CPCH01M4/70H01M4/66H01M4/36Y02E60/10
Inventor 苏一博汪长安钟敏霖张红军尹立坤陈林辉
Owner CHINA THREE GORGES CORPORATION
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