New iron trifluoride cathode material may triple lithium battery energy density

According to foreign media reports, the University of Maryland (UMD), the US Department of Energy's Brookhaven National Laboratory (Brookhaven National Laboratory) and the US Army Research Lab (US Army Research Lab) have developed and studied new cathode materials— — A modified design of iron trifluoride (iron trifluoride, FeF3), which may triple the energy density of the lithium-ion battery electrode.

This material is usually used in lithium-ion batteries, mainly due to intercalation chemistry (intercalation chemistry) method. However, complexes such as ferric trifluoride usually transport multiple electrons through a more complex conversion reaction.

Although the potential of FeF3 can increase the capacity of the cathode, the historical performance of the composite in lithium-ion batteries is not good, because there are three types of problems in conversion reactions: low energy efficiency (hysteresis), low reaction rate, side reactions (Side reactions) or lead to shortened life of lithium batteries.

To overcome this type of technical challenge, the research team added a cobalt yard and oxygen atoms to the FeF3 nanorods using a chemical substitution process, allowing researchers to manipulate the reaction pathway and achieve reversible reactions.

First, the researchers used transmission electron microscopy (TEM) to observe FeF3 nanorods at the Center for Functional Nanomaterials (CFN) with a resolution of up to 0.1 nanometer.

Subsequently, the researchers used the X-ray Powder Diffraction (XPD) beamline of the National Synchrotron Radiation Light Source II (NSLS-II) to make ultra-bright X-rays pass through the cathode material, and then applied discrete light Analysis, researchers or other information that can visually present the structure of the material.

To evaluate the functionality of this cathode material, the combination of CFN and NSLS-II's highly advanced imaging and microscopy techniques has become the key.

Researchers at the University of Maryland said that this research strategy may be applied to other high-energy conversion materials, and future research can also use this method to improve other battery systems.

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