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Lithium metal negative electrode current collector as well as preparation method and application thereof

A technology of lithium metal negative electrode and current collector, applied in the field of lithium metal negative electrode current collector and its preparation, can solve the problems of low lithium metal electrode potential, reduced battery cycle life, reduced battery coulombic efficiency, etc., and achieves uniform deposition and smoothing. Effects of dense deposition, improved cycle life and operational stability

Inactive Publication Date: 2021-09-21
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Despite the above advantages, lithium metal still faces many problems when used as a negative electrode material for batteries, mainly including the following aspects: Lithium metal, as a negative electrode material without a "host", with the progress of charging and discharging, its volume change will be affected by the repeated deposition of lithium metal / The dissolution process tends to infinity, which is much higher than that of graphite negative electrode (10%) and silicon-based negative electrode (400%); at the same time, the lithium metal electrode has low potential, strong reducibility, high reactivity, and can be used with most electrolytic The liquid reacts to form a solid electrolyte film (SEI film). With repeated charge and discharge, the volume of the electrode changes continuously, and the SEI film will continue to rupture and form, causing the electrolyte to be continuously consumed, resulting in a decrease in the Coulombic efficiency of the battery.
In addition, in the process of charging and discharging, due to the difference in local current density, lithium metal tends to deposit unevenly, eventually producing lithium dendrites, and some lithium dendrites break to cause "dead lithium", thereby reducing the cycle of the battery. Life, another part of lithium dendrites continue to grow and eventually pierce the separator, resulting in a short circuit of the battery, which is likely to cause safety accidents

Method used

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  • Lithium metal negative electrode current collector as well as preparation method and application thereof
  • Lithium metal negative electrode current collector as well as preparation method and application thereof
  • Lithium metal negative electrode current collector as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A preparation method of a lithium metal negative electrode current collector, specifically comprising the following steps:

[0045] S1. Cut the metal nickel-based current collector into an area of ​​3cm×3cm×1mm, and use acetone, 1mol / L hydrochloric acid, ethanol and deionized water to perform ultrasonic cleaning several times in sequence. The cleaning time is 30min, and then at 50°C Vacuum drying under temperature conditions for 600min;

[0046] Among them, the metal nickel-based current collector can be selected from but not limited to foamed nickel, nickel mesh, nickel plate, nickel foil, nickel alloy and other current collector materials. In this embodiment, the metal nickel-based current collector is preferably foamed nickel;

[0047] S2. Dissolve 2 mmol of sulfur source in 16 ml of aliphatic diamine, stir for 30 min, then add 16 mL of organic solvent, and continue stirring for 30 min to obtain a reaction solution;

[0048] Among them, the sulfur source can be, but...

Embodiment 2

[0058] A preparation method of a lithium metal negative electrode current collector, specifically comprising the following steps:

[0059] S1. Cut the metal nickel-based current collector into an area of ​​3cm×3cm×1mm, and use acetone, 1mol / L hydrochloric acid, ethanol and deionized water to perform ultrasonic cleaning several times in sequence. The cleaning time is 30min, and then at 50°C Vacuum drying under temperature conditions for 600min;

[0060] Among them, the metal nickel-based current collector can be selected from but not limited to foamed nickel, nickel mesh, nickel plate, nickel foil, nickel alloy and other current collector materials. In this embodiment, the metal nickel-based current collector is preferably foamed nickel;

[0061] S2. Dissolve 0.5 mmol of sulfur source in 20 ml of aliphatic diamine, stir for 30 min, then add 20 mL of organic solvent, and continue stirring for 30 min to obtain a reaction solution;

[0062] Among them, the sulfur source can be, b...

Embodiment 3

[0072] A preparation method of a lithium metal negative electrode current collector, specifically comprising the following steps:

[0073] S1. Cut the metal nickel-based current collector into an area of ​​3cm×3cm×1mm, and use acetone, 1mol / L hydrochloric acid, ethanol and deionized water to perform ultrasonic cleaning several times in sequence. The cleaning time is 30min, and then at 50°C Vacuum drying under temperature conditions for 600min;

[0074] Among them, the metal nickel-based current collector can be selected from but not limited to foamed nickel, nickel mesh, nickel plate, nickel foil, nickel alloy and other current collector materials. In this embodiment, the metal nickel-based current collector is preferably foamed nickel;

[0075] S2. Dissolve 1 mmol of sulfur source in 18 ml of aliphatic diamine, stir for 30 min, then add 18 mL of organic solvent, and continue stirring for 30 min to obtain a reaction solution;

[0076] Among them, the sulfur source can be, but...

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Abstract

The invention discloses a lithium metal negative electrode current collector as well as a preparation method and application thereof, and relates to the field of lithium metal batteries. The preparation method comprises the following steps of: S1, cutting, cleaning and drying a metal nickel-based current collector; S2, preparing a reaction solution from a sulfur source, aliphatic diamine and an organic solvent; and S3, adding the reaction solution and a metal nickel-based current collector into a polytetrafluoroethylene reaction kettle for reaction, then cleaning and drying the product, placing the product on lithium foil, dropwise adding a lithium salt solution, covering the product with another piece of lithium foil, fixing the foil and the product by using a clamp, standing, cleaning and drying the product to obtain a lithium metal negative electrode current collector finished product. One-dimensional fibrous / two-dimensional nano-sheet / three-dimensional Internet-shaped nickel sulfide is compounded on the surface of the lithium metal negative electrode current collector finished product, and the lithium metal negative electrode current collector finished product is applied to a lithium metal battery. By adopting the lithium metal negative electrode current collector as well as the preparation method and application thereof, the current density is reduced through utilizing the multi-dimensional nickel sulfide, so that the growth of lithium dendrites is inhibited, the size expansion is slowed down, and the cycle life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium metal batteries, in particular to a lithium metal negative electrode current collector and its preparation method and application. Background technique [0002] The development of human society is inseparable from energy technology. Fossil energy represented by coal, oil, and natural gas has played an important role in it and promoted the development of human society. However, in recent years, with the over-exploitation of fossil energy and global warming and other issues becoming increasingly prominent, energy and the environment are facing unprecedented challenges. [0003] Lithium-ion battery is the most promising secondary battery. It has many advantages, including: environmental friendliness, high safety performance, long charge and discharge cycle life, and low self-discharge. It has become an important field in the field of power batteries. research direction. At the same time, because th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/134
CPCH01M4/667H01M4/134H01M2004/027Y02E60/10
Inventor 刘全兵潘嘉杰石凯祥李俊豪曾令才刘桂峥
Owner GUANGDONG UNIV OF TECH