Conductive framework and preparation method thereof

Abstract

The invention provides a conductive framework and a preparation method thereof. The preparation method comprises the following steps of carrying out complete cleaning and then drying treatment on foamed nickel; preparing a reaction solution of cobalt nitrate and urea to obtain a precursor; putting the foamed nickel into the reaction solution, and coating the precursor on the foamed nickel by a solvothermal method; taking out the foamed nickel coated with the precursor, and carrying out cleaning and drying; and carrying out calcining on the dried foamed nickel coated with the precursor, and obtaining the foamed nickel coated with a cobaltosic oxide nanosheet. The outer layer with the foamed nickel as the conductive framework is coated with the cobaltosic oxide nanosheet, and the cobaltosicoxide nanosheet can improve the lipophilicity and enlarge the specific surface area of the foamed nickel, so that faster melting and filling of lithium; can be facilitated; and in addition, the foamednickel coated with the cobaltosic oxide nanosheet is used as a framework material of the lithium metal, so that the volume expansion of a lithium negative electrode can be reduced, the growth of thelithium dendritic crystal is inhibited, the storage life of the battery is prolonged, and high practicability is achieved.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a conductive framework and a preparation method thereof. Background technique [0002] At present, the rapid development of mobile devices, electric vehicles and smart grids has led to a lot of attention and research on high-energy-density secondary batteries, among which lithium metal is considered to be used for electrochemical energy due to its high specific capacity and low reduction potential. One of the most promising anode materials for storage. However, the metal lithium negative electrode has high reactivity and is prone to side reactions with the electrolyte; it is also easy to generate lithium dendrites and dead lithium. Lithium dendrites are produced due to uneven charge distribution and volume expansion on the electrode surface. Breaking through the diaphragm will lead to a short circuit of the battery, causing a series of safety problems such as thermal runa...

AI Technical Summary

Problems solved by technology

However, the metal lithium negative electrode has high reactivity and is prone to side reactions with the electrolyte; it is also easy to generate lithium dendrites and dead lithium. Lithium dendrites are produced due to uneven charge distribution and volume expansion on the electrode surface. Breaking through the diaphragm will lead to a short circuit of the battery, causing a series of safety problems such as thermal runaway and battery fire and explosion; dead lithium will increase the internal resistance and internal consumption of the battery, and reduce the energy density of the battery; when metallic lithium is used as the negative electrode material, infinite volume expansion will occur , resulting in continuous rupture and repair of the SEI film, metal lithium reacts with the electrolyte, consumes the limited lithium source inside the battery, and reduces the Coulombic efficiency of the battery

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