3.7v 18650 lithium battery

US research improves ability to predict 3.7v 18650 lithium battery life

Although lithium-ion batteries are now the mainstream of energy storage, the molecular and atomic basic science of their charging and discharging is still a mystery.

According to a study by the U.S. Department of Energy's Argonne National Laboratory in Nature Catalysis, the research team has made a breakthrough in the chemical composition of the solid-electrolyte interphase (SEI) between the electrode and the liquid electrolyte. Dusan Strmcnik, a chemical engineer at the Materials Science Division (MSD) of Argonne National Laboratory, said this will help improve the team's ability to predict battery life, which is crucial for electric vehicle manufacturers.

Scientists have long been committed to cracking the SEI of lithium-ion batteries, but they only know that SEI is formed when the battery is charged, producing a thousandth of a millimeter thick film on the graphite electrode, which protects the interface from harmful reactions and allows lithium ions to shuttle between the electrode and the electrolyte. Therefore, for lithium-ion batteries, a good SEI is a necessary condition. Strmcnik pointed out that battery efficiency and life depend on the quality of SEI. If scientists can find out its chemical properties and independent composition rules, they can use SEI to improve battery efficiency.

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

Experimental and calculation results show that hydrogen fluoride will produce electrochemical reaction during battery charging, which will transform from electrolyte into solid lithium fluoride and generate hydrogen. This kind of reaction is highly dependent on electrode materials such as graphite, graphene and metal, proving the importance of battery catalysts.

The team also developed a new method to detect hydrogen fluoride concentration. Since hydrogen fluoride is a harmful substance formed by moisture and lithium salt (LiPF6), this detection method plays a key role in future scientific research on SEI. Researcher Nenad Markovic said that the research will be tested at the BMW Battery Research and Development Center in the future. The next step of the research is to plan to design a new 3.7v 18650 lithium battery technology to open up another path for today's lithium-ion batteries.

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