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Copper current collector for lithium metal secondary battery, preparation method thereof and lithium metal secondary battery

A secondary battery, lithium metal technology, applied in the field of lithium metal secondary battery, copper current collector for lithium metal secondary battery, can solve problems such as unfavorable environmental safety, unfavorable large-scale production, complicated operation and the like

Inactive Publication Date: 2018-10-12
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses an acid solution to etch the copper current collector, and the acid solution needs to be post-treated, which is not conducive to environmental safety; and this method needs to be carried out by means of an electrochemical workstation, and the operation is complicated, which is not conducive to large-scale production

Method used

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  • Copper current collector for lithium metal secondary battery, preparation method thereof and lithium metal secondary battery
  • Copper current collector for lithium metal secondary battery, preparation method thereof and lithium metal secondary battery
  • Copper current collector for lithium metal secondary battery, preparation method thereof and lithium metal secondary battery

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preparation example Construction

[0041] The present invention also provides a method for preparing a copper current collector for a lithium metal secondary battery, comprising the following steps:

[0042] Using Tris-HCl buffer solution as a solvent, adding a modifier to prepare a modified solution;

[0043] placing the copper foil in the modified solution, and shaking at a constant temperature of 20-60° C. for 12-50 hours to obtain a copper current collector for a lithium metal secondary battery;

[0044] The modifying agent is a functional polymer and inorganic nanoparticles;

[0045] The functional polymer is a functional polymer with one or more groups in cyano group, hydroxyl group, amino group, aldehyde group and carboxyl group;

[0046] The inorganic nanoparticles are one or more of alkylated alumina nanoparticles, nano silicon dioxide, nano calcium carbonate, nano calcium phosphate and iron oxide nanoparticles;

[0047] In the present invention, the surface of the copper foil is preferably cleaned w...

Embodiment 1

[0058] Wash the surface of Cu foil with deionized water to remove impurities on the surface of Cu foil.

[0059] Prepare 0.01M Tris solution and 0.01M HCl solution respectively. Slowly drop the prepared HCl solution into the Tris solution to adjust the pH value of the solution to obtain a Tris-HCl buffer solution with a pH value of 8.5. With the above-mentioned buffer solution as a solvent, the catechol (CA) buffer solution of 2.5 g / L is prepared with the above-mentioned buffer solution as a solvent;

[0060] The copper foil was put into a catechol (CA) buffer solution, and was shaken at a constant temperature of 50°C for 24 hours so that the generated polymer was evenly introduced to the surface of the copper foil, thereby preparing a functional polymer layer modified copper current collector.

[0061] The copper current collector is used to prepare a lithium metal half-cell, and the specific composition is as follows:

[0062] The functional polymer layer modified copper c...

Embodiment 2

[0065] Wash the surface of Cu foil with deionized water to remove impurities on the surface of Cu foil.

[0066] Prepare 0.01M Tris solution and 0.01M HCl solution respectively. Slowly drop the prepared HCl solution into the Tris solution to adjust the pH value of the solution to obtain a Tris-HCl buffer solution with a pH value of 8.5. With the above-mentioned buffer solution as a solvent, the norepinephrine (NA) buffer solution of 2.5 g / L is prepared with the above-mentioned buffer solution as a solvent;

[0067] The copper foil was put into a norepinephrine (NA) buffer solution, and was shaken at a constant temperature of 50°C for 24 hours so that the generated polymer was evenly introduced to the surface of the copper foil, thereby preparing a functional polymer layer modified copper current collector.

[0068] The obtained curve is as figure 2 As shown, it can be seen that the coulombic efficiency of the functional polymer layer modified copper current collector is 92%...

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Abstract

The invention provides a copper current collector for a lithium metal secondary battery, comprising a copper foil and a polymer layer introduced on the surface of the copper foil, wherein the polymerlayer is a functional polymer with one or several groups of cyan, hydroxyl, amino, aldehyde group and carboxyl; inorganic nanoparticles are dispersed in the polymer layer; the inorganic nanoparticlesare one or several of alkylated alumina nanoparticles, nano silica, nano calcium carbonate, nano calcium phosphate, and iron oxide nanoparticles; and the inorganic nanoparticles have a mass fraction in the polymer layer of 0-5 percent. The invention introduces a functional polymer layer on the surface of the copper current collector, and the polymer layer may change the current density and stabilize the deposition of the metal lithium, thereby inhibiting the generation of lithium dendrites, stabilizing the SEI film, and improving the efficiency and safety of the lithium metal battery. The invention also provides a method for preparing a copper current collector for a lithium metal secondary battery and the lithium metal secondary battery.

Description

technical field [0001] The invention belongs to the technical field of lithium metal batteries, and in particular relates to a copper current collector for a lithium metal secondary battery, a preparation method thereof and a lithium metal secondary battery. Background technique [0002] The non-renewability of fossil energy and the pollution to the environment make people devote themselves to seeking safe and reliable renewable energy. At present, lithium-ion batteries are the most widely used energy storage devices, which bring great convenience to our daily life. At the same time, the rapid development of mobile electronic devices and electric vehicles makes it urgent to improve the energy density of lithium secondary batteries. Although many methods for improving the energy density of lithium ion batteries have been reported, lithium ion batteries still cannot meet the fast Increased energy density requirements. [0003] In the pursuit of higher energy density, metal l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/052
CPCH01M4/667H01M10/052Y02E60/10
Inventor 何盈石俊黎夏永高刘兆平许和伟
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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