Three-dimensional covalent organic frameworks, due to their structured nanochannels, open pore environment and good stability, have gained more and more attention

In this paper, a series of hard carbon materials with adjustable structure were prepared using chitosan as carbon source, and the relationship between the evolution of hard carbon structure and the properties of sodium storage was analyzed.

By X-ray diffraction of the material and analysis of its diffraction pattern, information such as the composition of the material, the structure or morphology of the internal atoms or molecules is obtained.

Many materials through rolling, extrusion and other deformation processes, or even if not deformed, the grains in the polycrystal show more or less statistical uneven distribution, this organizational structure is called texture.

The precursor of ternary material is a low-cost compound of variable valence metal, which will be oxidized in the air, and the higher the drying temperature, the more serious the oxidation degree, and the general choice of air atmosphere drying.

As a means of characterizing crystal structure and its change rule, XRD is widely used in many fields such as materials, chemistry, ceramics, metallurgy and minerals.

The main indicators of polymer materials include the type of polymer or its crystallinity. Polymers also exhibit different microstructure, which can also affect the mechanical .properties of polymer materials.

An important indicator of XRD is that there is a very good X-ray light source. The so-called good X-ray light source usually refers to high intensity, high parallelism and high purity. This paper will introduce one of the core technologies of neo-Confucianism, CBO optical path.

X-ray diffraction technology is widely used in the research of lithium-ion batteries. XRD is a conventional method for qualitative and quantitative analysis of phases in materials.

XRD can measure bulk and powder samples, and has different requirements for different sample sizes and properties.