New high-entropy energy storage materials promote the development of lithium batteries

According to foreign media reports, researchers from the Karlsruhe Institute of Technology (KIT) in Germany have proposed a new type of high-entropy data suitable for energy storage. In their paper, they reported the use of a simple mechanochemical method to prepare polyanionic and polycationic compounds. This method uses a recently designed high-entropy oxide based on multi-cation transition metals as the precursor, using LiF Or NaCl is the reactant, and lithium or sodiumization data is generated. Lithium entropy safe oxyfluoride compound (Lix(Co0.2Cu0.2Mg0.2Ni0.2Zn0.2OFx)), working potential 3.4VvsLi+/Li, can be used as a positive active material. Unlike traditional (non-entropy-stable) fluorine compounds, this new data benefits from entropy stability, showing a stronger lithium storage function, and modifying components in an unprecedented way to improve circulation. The concept of entropy stability is also applicable to sodium chloride oxide with a rock salt structure, paving the way for the development of post-lithium battery technology. In many different applications, high-entropy data has received widespread attention due to its novel, unexpected and unprecedented characteristics. HEM is based on the premise of introducing high configuration entropy to stabilize the single-phase structure. Many high-entropy compounds have been synthesized and published, including carbides, diborides, nitrides, sulfides and oxides, which are widely used in thermoelectric, dielectric and lithium batteries. The recently proposed high-entropy data is called high-entropy oxide (HEO), which was first proposed by Christinam.ost et al. in the United States in 2015. However, there is no report about the presence of multiple anions in HEM compounds. The stable high configuration entropy effect is only caused by the cations in the crystal structure, because the contribution of the anion sites is zero. Therefore, the preparation of multi-anion and multi-cation single-phase structures with significant entropy stability is of great significance, especially considering that the configurational entropy gain will be greater than that of the transition metal-based HEO system. KIT’s paper reported for the first time polyanion and polycation high-entropy oxygen halide and its application in electrochemical energy storage. The researchers used a multi-cation transition metal HEO (that is, only oxygen ions occupy anion sites) as a precursor, and introduced additional halogen ions (X) and alkali metal ions to form a multi-anion, multi-cation rock salt compound (HEOX) . Monovalent fluorine is introduced into the HEO anion lattice occupied by divalent oxygen, and the charge is compensated by participating in the monovalent lithium (or sodium) in the cationic lattice. Since the fluoride ion radius is similar to the oxygen ion radius, this substitution does not cause significant strain in the single-phase rock salt structure. By adding multiple anions to a single entropy-stable polycationic compound, the researchers discovered for the first time that when they are attached to a single-phase rock salt structure, not only the cations are changed, but the anions are also changed. These compounds constitute a new class of entropy stabilization data. The anionic lattice promotes the formation of configurational entropy, thereby obtaining additional structural stability gains. This method successfully synthesized the activity data of the fluorine cathode with a rock salt structure, which is suitable for the next generation of lithium batteries. It is worth mentioning that the entropy stability can significantly improve the loop function. In addition, this method can reduce the toxic and expensive elements in the battery anode without significantly affecting the energy density. In summary, the concept of multi-anions and multi-cation high-entropy compounds will bring unprecedented new energy storage data. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Importance of Lithium Battery Electrolyte