This paper mainly analyzes the cause of a black spot phenomenon on the negative surface of lithium iron phosphate battery.

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 three-dimensional space of atoms is arranged in a long-range order, and the smallest unit of repeated arrangement is called the cell, which can be divided into 7 kinds of crystal systems, 14 kinds of lattice, and 230 kinds of space groups according to the arrangement law.

X-ray diffraction (XRD) is a means of research to obtain information such as the composition of a material, the structure or form of an internal atom or molecule by analyzing its diffraction pattern through X-ray diffraction.

Dandong Tongda TD-5000X-ray single crystal diffractometer won the "ACCSI2023 Instrument and Detection 3i Award --2022 Annual Scientific Instrument Industry Outstanding New Product Award".

It is a professional manufacturer of X-ray analysis instruments and non-destructive testing instruments, and has obtained a number of certifications such as national high-tech enterprises, ISO quality system certification enterprises, and has an invention patent and utility model patent.

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.

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