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　　my country's new breakthrough in the field of high-nickel button cell battery cr2025 layered cathode materials

　　In recent years, the application of lithium-ion batteries has achieved rapid development, and it can do anything in the world. In particular, it has achieved remarkable results in applications such as electric vehicles and small grid energy storage. However, as the scope of applications becomes wider, people have higher and higher requirements for its energy density, cycle performance and rate performance.

　　In the internal structure of lithium batteries, there are many factors that affect its performance improvement. The four major materials of positive and negative electrode materials, separators and electrolytes are particularly critical. Among them, the cathode material of lithium-ion batteries is an important part that limits the improvement of its energy density.

　　Compared with currently commercialized lithium cobalt oxide, lithium iron phosphate and ternary materials, high-nickel layered materials have the advantages of high capacity and low cost, and are one of the first choices for the next generation of power battery cathode materials. However, its poor cycle stability and rate performance have become the main factors restricting its commercial application. This has a lot to do with the surface structure and chemical properties of high-nickel cathode materials.

　　The good news is that my country has made new progress in research on the surface structure and chemical properties of high-nickel cathode materials.

　　Recently, the Clean Energy Center research team led by Professor Pan Feng from the School of New Materials at Peking University Shenzhen Graduate School collaborated with Professors Wang Feng and Bai Jianming from Brookhaven National Laboratory in the United States to use in-situ synchrotron radiation X-ray diffraction spectroscopy and X-ray Absorption spectroscopy (XPS), scanning transmission microscopy-electron energy loss spectroscopy (STEM-EELS) combined with electrochemical characterization conducted an in-depth study of the surface reconstruction phenomenon and related mechanisms during the preparation process of high-nickel layered oxide materials for lithium-ion batteries. Research, this work was recently published in Advanced Energy Materials (IF=24.884), a well-known journal in the field of energy materials.

　　In addition, synchrotron radiation technology was used to conduct in-depth and systematic research on the impact and mechanism of surface reconstruction on cation disorder (lithium-nickel mixed arrangement) during the preparation process of high-nickel layered oxide materials for lithium batteries. Relevant work was published in famous journals "Journal of Materials Chemistry A".

　　Editor's comment

　　At present, high-nickel ternary materials are one of the mainstream directions in the development of battery materials. Studying the surface structure of high-nickel materials and finding out the structural origin and mechanism that affects their electrochemical properties is of great significance for improving the electrochemical properties of high-nickel materials and accelerating their industrialization process.

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