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3.7V 18650 lifepo4 battery manufacturer explains the research and application of lithium titanate, anode material for lithium-ion batteries
3.7V 18650 lifepo4 battery manufacturers explain the research and application of lithium titanate, the negative electrode material of lithium-ion batteries. Lithium batteries are widely used in mobile electronic devices and have good application prospects in electric vehicles and various energy storage systems. They are one of the most promising energy storage batteries in the future. As an anode material for lithium-ion batteries, lithium titanate has attracted much attention due to its high lithium deintercalation platform potential, excellent cycle performance, outstanding thermal stability and safety characteristics. The following is a 3.7V 18650 lifepo4 battery manufacturer explaining the research and application of lithium titanate, the negative electrode material of lithium ion batteries.
3.7V 18650 lifepo4 battery manufacturer explains the research and application of lithium titanate, anode material for lithium-ion batteries
Currently, most commercialized lithium-ion battery anode materials use various lithium-embedded carbon materials. Carbon materials have some fatal defects, such as the material preparation method is complicated; it is easy to form a surface passivation film during the cycle, leading to capacity loss; and it is easy to Washing out lithium dendrites can short-circuit the battery, causing safety issues. 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 rate and safety requirements.
Lithium titanate battery applications: portable power tools, energy storage power supplies; automotive emergency starting power supplies, battery modules, energy storage base station power supplies; solar photovoltaic products, LED lighting; replacement of supercapacitors, storage power supplies.
Lithium titanate batteries are considered to be one of the most promising anode materials for high-power lithium-ion batteries due to their inherent characteristics. On the one hand, it has a high lithium insertion potential, which can prevent the occurrence of lithium dendrites and the formation of the solid electrolyte interface film, thereby improving safety performance;
On the other hand, lithium titanate has very little volume change during the lithium intercalation/deintercalation process, so it is called a "zero strain" material. This "zero strain" material gives it excellent reversibility and long life. Although Lithium titanate has great application potential in lithium batteries, but its low conductivity and small lithium ion diffusion coefficient hinder its development to a certain extent.
Lithium titanate is used as an anode material that has attracted much attention because of its following advantages:
1) Lithium titanate has almost "zero strain" before and after deintercalation of lithium (the unit cell parameter "a" before and after deintercalation of lithium only changes from 0.836nm to 0.837nm);
2) The lithium insertion potential is high (1.55V), which avoids the generation of "lithium dendrites" and is safer;
3) There is almost no structural change during the charge and discharge process, and the cycle performance is good; it has a good charge and discharge platform;
4) High chemical diffusion coefficient and Coulombic efficiency;
5) Compared with commercial carbon anode materials, they usually have better electrochemical performance and safety.
Compared with traditional commercial carbon anode materials, lithium titanate has a higher lithium insertion potential and can prevent the electrolyte on the electrode surface from being reduced. Moreover, as a zero-strain lithium-embedded material, lithium titanate has superior reversibility, structural stability and excellent lithium ion mobility during the charge and discharge process, so lithium titanate has good cycle performance and safety performance. Although lithium titanate has many of the above advantages, its electronic conductivity is very low, which limits its commercial application.
As an anode material for lithium-ion batteries, lithium titanate faces the problems of poor conductivity, high current charge and discharge performance, and low density. The current method to solve the conductivity problem is to add a certain amount of carbon to the particles, but the effect is not very good. The preparation of lithium titanate anode mainly uses solid-phase reaction method and sol-gel method.
As a "zero strain material", lithium titanate plays an important role in the negative electrode material of lithium batteries. Although it has problems such as poor conductivity and rapid decay of high-rate performance, which restricts the application of lithium titanate in lithium batteries, it Based on the high safety, high stability, long life and green environmental protection characteristics of lithium titanate. Lithium titanate material has great research value and commercial application prospects as anode material for power and energy storage lithium-ion batteries.
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