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Copper-based current collector for inducing preferential transverse deposition of lithium metal negative electrode as well as preparation method and application of copper-based current collector

A lithium metal negative electrode and current collector technology, which is applied in the direction of negative electrodes, electrode carriers/current collectors, battery electrodes, etc., can solve the problems of induction or limitation of metal negative electrode deposition directions, and achieve easy scale-up and industrial application, with low equipment requirements , Environmentally friendly effect

Inactive Publication Date: 2021-06-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention innovatively composites metal zinc on the skeleton of the 3D porous current collector; the current collector of this structure can effectively maintain the stability of the skeleton during the deposition of sodium or potassium metal; at the same time, the metal zinc evenly distributed on the pore skeleton can be Induce metal sodium or potassium nucleation, make full use of the effective specific surface area of ​​the 3D current collector during the deposition of sodium or potassium, and achieve dendrite-free sodium or potassium deposition and long cycle life, but the 3D porous zinc-loaded current collector cannot Induce or restrict the deposition direction of the metal anode

Method used

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  • Copper-based current collector for inducing preferential transverse deposition of lithium metal negative electrode as well as preparation method and application of copper-based current collector
  • Copper-based current collector for inducing preferential transverse deposition of lithium metal negative electrode as well as preparation method and application of copper-based current collector
  • Copper-based current collector for inducing preferential transverse deposition of lithium metal negative electrode as well as preparation method and application of copper-based current collector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for preparing a copper-based current collector that induces preferential lateral deposition of lithium metal negative electrodes, comprising the following steps:

[0053] S1. Clean the surface of copper-zinc-based foil: ultrasonically clean commercially available commercial brass foil three times with absolute ethanol, wipe the surface with dust-free paper, and then soak it in 0.1mol / L dilute hydrochloric acid for 30s to remove The oxide impurities on the surface of the foil are rinsed with deionized water and absolute ethanol and dried at room temperature for later use. The brass foil used is H62, the thickness is 20 μm, and the price is low.

[0054] S2. Precursor preparation by wet chemical method: Prepare an ammonia solution with a concentration of 0.03mol / L with deionized water and concentrated ammonia water, and then pre-cool at 2-8°C. After the solution temperature reaches the specified temperature, the copper after S1 treatment The zinc-based foil was e...

experiment example 1

[0069] This experimental example compares the deposition morphology of lithium metal on a planar copper current collector and on a copper-based current collector that can induce its preferential lateral deposition.

[0070] Electrodeposition of lithium metal by assembling half-cells. In the half-cell, use commercial lithium foil as the negative electrode, 1MLiTFSI / DOL+DME (volume ratio 1:1)+1% LiNO 3 It is the electrolyte, PP is the diaphragm, and the current collector is the positive electrode. The assembly of the battery is carried out in a glove box protected by an argon atmosphere, and the oxygen value of water in the atmosphere is lower than 0.01ppm. The half-cells left for 24 hours were charged and discharged five times at a current density of 50 μA and a voltage range of 0 to 1 V for activation treatment, and then activated at 1 mA / cm 2 Electrodeposition was performed by discharging for two hours at a certain current density. The cells that completed the electrodepos...

experiment example 2

[0073] In this experimental example, the Coulombic efficiency of lithium metal deposition / dissolution was compared on a planar copper current collector and a copper-based current collector that can induce preferential lateral deposition of lithium metal.

[0074] This experimental example is tested in a half-cell, and the assembly method of the half-cell is the same as that of Experimental Example 1. The coulombic efficiency test was carried out by Xinwei 5V / 10mA battery tester. The deposition capacity is 1mAh / cm 2 , the stripping cut-off voltage is 1V. The current density of deposition and stripping is 1mA / cm 2 .

[0075] Figure 7 is the Coulombic efficiency curve of the half-cell obtained in Experimental Example 2.

[0076] Because on the copper-based current collector that can induce the preferential lateral deposition of lithium metal, the deposition of lithium metal is smoother, the formation of lithium dendrites is suppressed, and the generation of dead lithium is ...

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Abstract

The invention relates to a copper-based current collector for inducing preferential transverse deposition of a lithium metal negative electrode as well as a preparation method and application thereof. According to the current collector, a zinc oxide layer and a copper nanosheet array grow in situ or are modified on the surface of a copper-based foil in an ectopic mode, the zinc oxide layer is laid on the surface of the copper-based foil, and the copper nanosheet array vertically penetrates through the zinc oxide layer and is connected with the copper-based foil substrate. The compact zinc oxide layer of the current collector reduces the charge density in the parallel direction, and prevents deposition and growth of lithium metal in the vertical direction of the current collector. The lithiophilic copper nanosheet array and the zinc oxide layer have a synergistic effect to induce the lithium metal to preferentially and transversely deposit and inhibit the generation of lithium dendrites, so that the safety of the lithium metal battery is improved, and the cycle life of the lithium metal battery is prolonged.

Description

technical field [0001] The invention relates to a copper-based current collector that induces preferential lateral deposition of lithium metal negative electrodes, a preparation method and application thereof, and belongs to the technical field of batteries. [0002] technical background [0003] Today's society has put forward higher and higher requirements for new energy vehicles and energy storage. Traditional lithium-ion batteries using graphite anodes are gradually unable to meet these requirements. Therefore, a new generation of battery systems with higher energy density is urgently needed in various fields. Lithium metal has a high theoretical specific capacity (3680mAh / g), the lowest reduction potential (-3.04V vs. SHE) and a very small density (0.534g / cm 3 ), is an ideal material for the negative electrode of lithium batteries. In this context, the research and development of lithium metal anodes has become an indispensable link in the strategic deployment of the ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/134H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/667H01M4/661H01M4/66H01M4/134H01M10/0525B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 边秀房杨映晖王军长孙辰翊
Owner SHANDONG UNIV
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