The research results of the new generation of lithium-rich manganese-based cathode materials for power lithium-ion batteries mainly focus on improving battery energy density, cycle life and safety.

Lithium-rich manganese-based cathode materials have extremely high specific discharge capacity, reaching 300mAh/g, which is about double the specific discharge capacity of currently commercially applied cathode materials such as lithium iron phosphate and ternary materials. Therefore, it is regarded as an ideal choice for the new generation of high energy density power lithium battery cathode materials. However, to actually apply it to power lithium batteries, some key scientific and technical issues still need to be solved, such as reducing the first irreversible capacity loss, improving rate performance and cycle life, and suppressing voltage attenuation during the cycle process.

In order to solve these problems, the research team has developed a novel gas-solid interface modification method. This method allows uniform oxygen vacancies to be formed on the surface of the lithium-rich manganese-based cathode material particles, thereby greatly improving the first charge and discharge efficiency, discharge specific capacity and cycle stability of the material. At the same time, they used various advanced analytical characterization methods and theoretical calculations to study the lithium ion deintercalation mechanism in the presence of oxygen vacancies, and proposed to improve the first charge and discharge efficiency of lithium-rich manganese-based cathode materials by increasing the activity of lattice oxygen. and new ideas for rate performance.

In addition, lithium-rich manganese-based cathode materials also have some other advantages, such as lower cost and good safety performance. Compared with expensive cobalt and nickel, lithium-rich manganese-based materials are cheaper and have higher economics in mass production. At the same time, under conditions such as high temperature and overcharge and discharge, lithium-rich manganese-based materials are less likely to cause safety accidents such as overheating and combustion of lithium batteries than cobalt materials.

However, lithium-rich manganese-based cathode materials also have some challenges, such as relatively short cycle life and relatively poor electrochemical stability. After long-term charge and discharge cycles, lithium-rich manganese-based materials often undergo structural changes and particle agglomeration, leading to battery capacity loss and reduced cycle life. Especially under high voltage and high temperature conditions, structural damage and loss of lithium ions are prone to occur.

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