Unraveling Li-battery Solid Electrolyte Interfa-Lithium - Ion Battery Equipment

Unraveling Li-battery Solid Electrolyte Interface Components -Lithium - Ion Battery Equipment

Although lithium batteries have become the mainstream of today's energy storage, the molecular and atomic basic science of their charge and discharge is still a mystery.

According to the "NatureCatalysis" study by the U.S. Department of Energy's Argonne National Laboratory, the research team has made a breakthrough in obtaining the chemical composition of the solid-electrolyteinterphase (SEI) between the electrode and the liquid electrolyte. This will help improve the team's ability to predict battery life, which is critical for electric vehicle manufacturers, said Dusan Strmcnik, a chemical engineer in Argonne National Laboratory's Materials Science Division (MSD).(Lithium - Ion Battery Equipment)

Scientists have been working on deciphering the SEI of lithium batteries for a long time, but they only know that SEI is formed when the battery is charged, and a thousandth of a millimeter thick film appears on the graphite electrode, and the film can protect the interface from harmful reactions, while allowing lithium ions in There is a shuttle between the electrode and the electrolyte, so for lithium batteries, a good SEI is a necessary condition. Strmcnik pointed out that battery efficiency and lifetime depend on the quality of SEI, and if scientists can figure out its chemical properties and independent composition rules, SEI can improve battery efficiency.

Therefore, an international research team composed of Argonne National Laboratory, the University of Copenhagen in Denmark, the Technical University of Munich in Germany and the BMW Group successfully solved the common chemical substance lithium fluoride in the SEI of lithium batteries.

The experimental and computational results point out that the electrochemical reaction of hydrogen fluoride occurs during the charging process of the battery, from electrolyte to solid lithium fluoride and generates hydrogen. importance.

The team also developed a new method to detect the concentration of hydrogen fluoride. Since hydrogen fluoride is a harmful substance formed by moisture and lithium salt (LiPF6), this detection method will play a key role in the future scientific research of SEI. Researcher Nenad Markovic said that the research will be tested in the BMW battery research and development center in the future, and the next step of the research is to plan to design a new lithium battery technology, which will open up another way for today's lithium batteries.



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