Negative electrode material ultrasonic test sieve

Thursday June-19 2025  17:47:54

What is the negative electrode material ultrasonic test sieve

Negative electrode material ultrasonic test sieve is a high-precision sieving equipment designed for negative electrode materials of lithium batteries. It is widely used in the particle size detection of fine powders such as graphite, silicon-carbon, and carbon nanomaterials. Because these materials have fine particle sizes, are easy to agglomerate, and carry static electricity, they are prone to clogging and inaccurate classification in traditional mechanical vibrating sieves.

Ultrasonic test sieve is based on ordinary electric sieve, and high-frequency ultrasonic system is added. By superimposing high-frequency micro-vibration of about 20kHz on the sieve, it effectively breaks the electrostatic adsorption and agglomeration between materials. It is suitable for particle size classification with mesh size up to 500 mesh (25μm) or even finer.

Difference between ultrasonic test sieve and ultrasonic vibration sieve

Project	Ultrasonic test sieve	Ultrasonic vibration sieve
Image
Structural features	Mostly integrated small structure, with supporting test sieve frame	Large structure, using standard sieve machine structure with ultrasonic device
Used sieve frame	Standard test sieve frame (generally Φ200mm/Φ300mm)	Customized sieve frame, the sieve surface diameter is generally 400mm and above
Precision requirements	Extremely high, suitable for particle size analysis	High precision, but taking into account output and continuity
Screen mesh support	Support up to 500 mesh and above	Support high Precision sieve, but more suitable for 100-325 mesh common screening
Application scenarios	Laboratory analysis, research and development, small sample testing	Fine screening in industrial production processes

What materials cannot be used for ultrasonic test sieves

Ultrasonic test sieves are suitable for screening of negative electrode materials with various characteristics due to their efficient screening performance and anti-blocking net function, including fine powder and ultrafine powder materials below 10μm, such as nano-silicon powder, graphene-modified negative electrode materials; surface-modified graphite powder (coated with asphalt or carbon layer) and other easy-to-agglomerate, sticky materials, as well as high-density, high-hardness materials such as tin powder and aluminum powder.

Highly corrosive materials: such as negative electrode precursors containing strong acids/strong alkalis (which may corrode the sieve material).

Inflammable and explosive materials: Pure metal powders (such as lithium powder) may generate static electricity due to friction under ultrasonic vibration, which poses a safety hazard and needs to be used with explosion-proof devices.

Large-particle block materials: Materials with a particle size exceeding the upper limit of the sieve mesh (such as greater than 300μm) are recommended to be pre-treated by coarse screening first.

Why choose ultrasonic test sieve to screen negative electrode materials

The ultrasonic test sieve can effectively overcome the limitations of traditional screening methods by introducing high-frequency, low-amplitude ultrasonic vibrations, and is particularly suitable for the screening of negative electrode materials. Ultrasonic vibrations produce high-frequency micro-vibrations on the screen, which can destroy the adhesion, agglomeration, friction between powder particles and eliminate electrostatic effects, so that particles blocked in the screen holes are "bounced", thereby effectively preventing the screen from being blocked.

① High-precision screening: It can effectively control the screening particle size range and achieve high-precision screening, and the screening accuracy can be increased by 10%-70%.

② High pass rate: It can make the material pass through the screen holes faster, improve the penetration efficiency of the screen, increase the screening rate by 50%-400%, and increase the output by 0.5-10 times.

③ Anti-blocking net function: The thorough self-cleaning function of the screen, through high-frequency ultrasonic vibration, keeps the material on the surface of the screen in a suspended state at all times to prevent the material from blocking the mesh holes. Screening greater than 500 mesh can also achieve no mesh blockage and no screening efficiency attenuation.

The corresponding relationship between the mesh number and particle size of the ultrasonic test sieve of negative electrode materials

Mesh number (mesh)	corresponding particle size (μm)	screening accuracy level
10~50	1700~300	coarse screen
50~200	300~75	medium screen
200~400	75~38	fine screen
400~635	38~20	ultrafine screen

What can the ultrasonic test sieve of negative electrode materials be used for

The ultrasonic test sieve of negative electrode materials is mainly used for particle size analysis and fine screening of negative electrode materials of lithium batteries (such as artificial graphite, natural graphite, silicon-carbon composite materials, silicon-based materials, etc.). In the laboratory, it solves the screening problems of easy agglomeration, strong adsorption and high static electricity of negative electrode materials through high-frequency ultrasonic vibration (36,000 times per second), ensuring that the screening accuracy of 80-600 mesh ultrafine powder reaches more than 99.5%.

Production of negative electrode materials for lithium batteries: In the production process of negative electrode materials such as graphite powder and silicon-based materials, it is used to screen powders of different particle sizes to ensure the performance of negative electrode materials and the energy storage effect of batteries.

Experiments in scientific research institutions: When scientific research institutions conduct research and development and testing of negative electrode materials, it can be used to accurately screen negative electrode material samples of different particle sizes to provide high-quality test materials for research.

In short, the ultrasonic test sieve is a device used for particle size analysis of powder materials. It uses ultrasonic vibration to improve screening efficiency and accuracy. It is an indispensable precision screening equipment in the production and development of negative electrode materials for lithium batteries. It effectively solves the problem of fine powder screening and is of great significance to improving the quality of negative electrode materials and battery performance.