Etching process of lithium battery -Lithium - Ion Battery Equipment

Etching process of lithium battery in German schools and enterprises -Lithium - Ion Battery Equipment

RENA Technology, a supplier of wet chemical processing equipment in the solar energy industry in Germany, has cooperated with Christian Albrecht University (CAU) in Kiel to develop a new production process of silicon anode for lithium ion batteries, which draws on similar online technologies adopted by RENA in the solar energy industry.

RENA has rich experience in developing solar cell processing equipment, and has turned its attention and expertise to the growing energy storage industry, especially in the development of silicon anodes, to improve the efficiency and performance of lithium ion batteries, which is the most commonly used chemical component in fixed storage applications.

RENA and the team worked with CAU experts and found that silicon can handle more lithium ions than graphite, which is a common material for anode production. However, the energy density of silicon anode is ten times that of graphite. The long-term problem is that silicon becomes unstable when lithium ions are loaded, which means that the cycle life of silicon anode is very short.(Lithium - Ion Battery Equipment)

In order to overcome this shortcoming, the researchers of CAU used the electrochemical etching step to structure the silicon and add voids in the anode so that the silicon can expand without breaking.

Although this process is effective, it is not suitable for large-scale production, because it usually requires sealing the processed substrate to avoid short current between positive and negative electrodes. Therefore, any product requiring high output in production, such as lithium ion battery, is not suitable for etching process.

Entering RENA, a German company, can adjust its solar cell online process by simplifying the machine to deal with silicon electrochemical etching with large modulus.

Sandra Hansen, a researcher at CAU, said: "RENA's experience in equipment and process development is an important factor in transferring this technology to the industrial field."

Franck Delahaye, business development manager of RENA, added: "The deep knowledge of CAU in material science, silicon anode and battery manufacturing will be the key to integrating silicon materials processed on our system into high-performance lithium-ion batteries."

In addition to battery manufacturing, the online system is also suitable for further high-yield applications, such as solar cell manufacturing. Delahaye concluded: "There, porous silicon can be used as a separation layer to separate epitaxial structures, such as solar cells or silicon wafers, which are deposited on silicon wafers after the electrochemical etching step."



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