Dynamic evolution of dendrites observed under PJ40-BD material analysis microscope

01 Real Video Shooting

02 Definition Principle/Define

definition:

Dendrites, a microstructure widely present in both natural and artificial materials. From a definition perspective, dendrites refer to tree like structures composed of main stems and branches, with diverse shapes and high levels of complexity and diversity.

Principle:

The formation of dendrites is a complex and intricate process involving the interaction of physical and chemical factors in crystal growth. During the process of crystal growth, due to various factors such as temperature, concentration, and impurities, the speed and direction of crystal growth will change, resulting in the formation of dendritic crystal structures.

03 Dendrite growth

Dendrite growth involves complex mechanisms. Taking lithium dendrites as an example, lithium ions form dendritic metallic lithium at the negative electrode during charging. The growth of dendrites is a dynamic process that is influenced by various factors such as current density, electrolyte, temperature, and negative electrode material.

04 Experimental process/Process

Lithium dendrites during electrodeposition processIn situ optical snapshot of growth

Experimental objective:

Gain a deeper understanding of the dynamic evolution and deposition process of lithium dendrites, as well as their morphological patterns.

Experimental process:

Firstly, it is necessary to fabricate a battery device with a quartz glass window to assemble a Li | Li symmetric battery, and then place it under an optical microscope to observe the dynamic deposition process of lithium.

We have selected materials with specific physical and chemical properties, including lithium batteries and precision electrolyte solutions, to ensure the accuracy and reliability of experimental results. To simulate the actual material growth environment. Mix and grind the raw materials according to the predetermined ratio and method to obtain a uniform mixture, and pay special attention to controlling the mixing time and temperature.

The experiment used an advanced dendritic growth observation system, which integrates high-resolution microscopes and image acquisition and analysis software, and can observe and record the entire process of dendritic growth in real time. and toThe system is calibrated and the sample is placed on the microscope observation platform according to standard operating procedures. By adjusting the focal length and light source, we can clearly observe the microstructure of the sample.

Experimental summary:

Using high-resolution imaging technology to capture the dynamic evolution of dendrites, especially the process of discrete lithium dendrite distribution shifting towards cluster growth under different current densities.

At different current densities, two different dendritic morphologies are observed. The morphology of lithium dendrites can be divided into two types: discrete single lithium dendrites, such as needle like and whisker like structures; Carp branch crystals that develop in clusters at a certain location, such as mossy, shrub like, and tree like.

05 Instrument Introduction/Experimentation

PJ40-BD semiconductor inspection microscope:

This microscope can inspect devices and wafers, especially suitable for small and medium-sized semiconductor FPD inspection. Its high cost-effective bright field optical system adopts a new semi cancellation technology, supports multiple observation methods, and provides clear and high contrast microscopic images. The system structure is solid and reliable, with ergonomic design. The accessories are complete, the configuration is complete, and the functions can be flexibly combined and expanded, making it an effective tool for industrial testing.

Instrument specifications