Unlock solid electrolyte interface components of lithium battery to create new battery technology.

Although lithium ion battery is today's energy storage mainstream, but the charge and discharge of molecules and atoms basic science is still a mystery.

And according to the U.S. department of energy (doe) argonne national laboratory in the Nature Catalysis research pointed out that the team have concluded in breakthrough electrode between liquid electrolyte and solid electrolyte interface (solid - electrolyteinterphase, SEI) chemical composition. Argonne national laboratory for materials science department (MSD) chemical engineer Dusan Strmcnik said, this will help to improve the team battery life prediction ability, and this is very important to electric car manufacturers.

For a long time scientists have dedicated to crack the lithium ion battery SEI, but only know when the battery will form the SEI formation, produced in the graphite electrode per mm thick film, the film can protect interface produces harmful reaction, and lithium ion moves back and forth between the electrode and the electrolyte, thus for lithium ion batteries, the performance good SEI as necessary. Strmcnik pointed out that the efficiency and battery life depends on the quality of SEI, if scientists can find out its chemical properties and rules of the independent component, can by SEI, promote efficiency of the battery.

So the argonne national laboratory and the university of Copenhagen in Denmark, Germany Munich university of technology, and the composition of the BMW group international research team, and successfully solve the lithium ion battery lithium fluoride SEI common chemicals (lithium fluoride).

In the process of experiment and calculation results, points out that the battery can produce hydrogen fluoride (hydrogen fluoride) electrochemical reaction, the electrolyte into solid lithium fluoride and generate hydrogen gas, this kind of reaction is highly dependent on graphite and graphene and electrode materials such as metals, prove the importance of cell catalysts.

The team is also developing new test way of hf, because the hydrogen fluoride is formed by moisture and lithium salt (LiPF6) harmful substances, the test methods in the SEI scientific research in the key position in the future. Researcher NenadMarkovic, said the study in the future will be in the BMW battery research and development center test, study the next step is planning to design new lithium-ion battery technology, open another road of the lithium ion battery.

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