Detailed explanation of the research and use of lithium titanate as anode material for lithium batteries

At present, most commercial lithium battery anode materials use various lithium-intercalated carbon materials. Carbon materials have some fatal defects, such as complicated material preparation methods; surface passivation films are easy to form during the cycle, resulting in capacity loss; at the same time, they are easy to wash Lithium dendrites will short-circuit the battery, causing safety issues and so on. Compared with carbon anode materials, alloy anode materials have higher specific capacity, but their cycle performance is relatively poor. Therefore, it is necessary to develop new anode materials that can meet the requirements of rate and safety. Lithium titanate battery use: portable electric tools, energy storage power supply; car emergency starting power supply, battery module, energy storage base station power supply; solar photovoltaic products, LED lighting; replacement of super capacitor, storage power supply. Lithium titanate batteries are considered to be one of the most promising anode materials for high-power lithium batteries due to their inherent characteristics. On the one hand, it has a high lithium intercalation potential, which can guard against the appearance of lithium dendrites and the formation of solid electrolyte interface films, thereby improving safety performance; on the other hand, the volume change of lithium titanate during the lithium intercalation/deintercalation process is very small. Therefore, it is called zero-strain material. This kind of zero-strain material makes it have excellent reversibility and long life. Although lithium titanate has great potential for use in lithium batteries, its conductivity is low, and lithium ion The small diffusion coefficient hinders its development to a certain extent. Lithium titanate is used as a negative electrode material that has attracted much attention because of its advantages: 1) Lithium titanate has almost zero strain before and after lithium extraction (the unit cell parameter a changes from 0.836nm to 0.837nm before and after lithium extraction) 2) The lithium intercalation potential is high (1.55V), and lithium dendrites appear on guard, and the safety is high; 3) There is almost no structural change during the charging and discharging process, and the cycle performance is good; there is a good charging and discharging platform; 4 ) High chemical diffusion coefficient and Coulomb efficiency; 5) Compared with commercial carbon anode materials, it usually has better electrochemical performance and safety. Compared with traditional commercial carbon anode materials, lithium titanate has a higher lithium insertion potential, which can prevent the electrolyte on the electrode surface from being reduced. Moreover, as a zero-strain lithium intercalation material, lithium titanate has superior reversibility, structural stability and excellent lithium ion mobility during charge and discharge, so lithium titanate has better cycle performance and safety performance. Although lithium titanate has many of the above advantages, the electronic conductivity of lithium titanate is very low, which limits its commercial use. As a negative electrode material for lithium batteries, lithium titanate faces the problems of poor conductivity and high-current charge and discharge performance and low density. The current method of dealing with the conductivity problem is to add a certain amount of carbon to the particles, but the effect is not very good. The preparation of the lithium titanate anode mainly uses the solid phase reaction method and the sol-gel method. As a zero-strain material, lithium titanate has an important use in lithium battery anode materials. Although it has problems such as poor conductivity and high rate performance degradation, it restricts the use of lithium titanate in lithium batteries, but it is based on titanium Lithium oxide has the characteristics of high safety, high stability, long life and environmental protection. Lithium titanate material has great research value and commercial application prospects as a negative electrode material for power and energy storage lithium batteries. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Analysis of the advantages of power lithium batteries