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Fast ion-conducting lithium nitride grows in a "graphene" mode

wallpapers News 2021-03-26
Due to the special room temperature ion conductivity (10-3 S cm-1), lithium nitride was originally proposed as an electrolyte for all-solid-state lithium-ion batteries. In fact, for decades, although people have been trying to stabilize crystalline lithium-ion, although its low decomposition potential hinders its application, it is still the highest conductive crystalline lithium-ion conductor under environmental conditions. However, doping with late transition metals triggers electronic conductivity, which can be used in the negative electrode at a performance that is twice the charge capacity of graphite. In addition, lithium nitride has also been proposed for countless other applications, for example, as a means to convert CO2 into useful products; as an electron injection layer in organic light-emitting diodes, and as one of organic chemistry and organometallic chemistry. An unusual reducing agent. As early as 2002, studies found that lithium nitride is a potential candidate for solid-state hydrogen storage because it can hold up to 10.4 wt.% H2. However, the slow kinetics of hydrogen adsorption and the high (dehydrogenation) hydrogenation temperature are the main obstacles that need to be overcome before lithium-hydrogen systems can be commercially developed.
 
Here, through a combination of experiments and calculations, the researchers proved that the changes in an electronic structure and the shortening of diffusion length caused by chemical nanostructures can cause huge changes in electronic properties and ion transport behavior. In this article, Duncan H. Gregory and others from the University of Glasgow, UK, followed the design principles of materials similar to hexagonal graphene and boron nitride and proved that s-zone elements and nitrogen can also form such a low-dimensional structure.
 
Achievement highlights
1. The study found that in the absence of an equivalent van der Waals gap, both one-dimensional and two-dimensional nanostructures of lithium nitride can be grown. Compared with bulk compounds, lithium-ion diffusion is enhanced, resulting in materials with special ion mobility.
2. Lithium nitride demonstrates the concept of assembling ionic inorganic nanostructures from monomolecular layers without the need for van der Waals gaps. Computational studies have revealed an electronic structure mediated by the number of Li-N layers, transitioning from bulky narrow bandgap semiconductors to metals on the nanoscale.
 
This study clearly shows that under appropriate synthesis conditions, the s-block elements can be combined with nitrogen to form anisotropic nanomaterials. Nanostructures have obvious effects on many chemical and physical properties of the lithium nitride system, and other exciting phenomena and behaviors may also be found.

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