New lithium battery technology -Lithium - Ion Battery Equipment

New lithium battery technology -Lithium - Ion Battery Equipment

Although lithium ion batteries have become the mainstream of energy storage, the basic science of molecular and atomic charging and discharging is still a mystery.

According to the research of Argonne National Laboratory of the US Department of Energy in NatureCatalyst, the research team has made a breakthrough in obtaining the chemical composition of the solid electrolyte interface (SEI) between the electrode and the liquid electrolyte. Dusan Strmcnik, chemical engineer of Materials Science Department (MSD) of Argonne National Laboratory, said that this would help improve the team's ability to predict battery life, which is crucial for electric vehicle manufacturers.

Scientists have been committed to deciphering the SEI of lithium-ion batteries for a long time, but only know that the SEI will be formed when the batteries are charged, and a film with a thickness of one thousandth of a millimeter will be generated on the graphite electrode. The film can protect the interface from harmful reactions, and allow lithium ions to shuttle between the electrode and the electrolyte. Therefore, for lithium-ion batteries, the SEI with good performance is a necessary condition. Strmcnik pointed out that the battery efficiency and life depend on the quality of SEI. If scientists can find out its chemical properties and independent component rules, they can use SEI to improve the battery efficiency.(Lithium - Ion Battery Equipment)

Therefore, Argonne National Laboratory, together with Copenhagen University in Denmark, Technical University of Munich in Germany and BMW Group, formed an international research team and successfully solved the lithium fluoride, a common chemical in lithium ion battery SEI.

The experimental and calculation results indicate that the electrochemical reaction of hydrogen fluoride will be generated during the battery charging process, which will transform from electrolyte to solid lithium fluoride and generate hydrogen. This kind of reaction highly depends on electrode materials such as graphite, graphene and metal, proving the importance of battery catalyst.

The team also developed a new method to detect the concentration of hydrogen fluoride. Because hydrogen fluoride is a harmful substance formed by moisture and lithium salt (LiPF6), this method plays 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. The next step in the research is to plan to design a new lithium-ion battery technology, which will open up another way for today's lithium-ion batteries.



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