About the advantages and disadvantages of lithium titanate batteries

Advantages of lithium titanate battery Lithium titanate battery has the advantages of small size, light weight, high energy density, good sealing performance, no leakage, no memory effect, low self-discharge rate, rapid charge and discharge, long cycle life, and working environment temperature Wide range, safety, stability, and environmental protection, so it has a very broad application prospect in the field of communication power supply. When lithium titanate is used as a negative electrode material, the potential platform is as high as 1.55V, which is more than 1V higher than the traditional graphite negative electrode material. Although some energy density is lost, it also means that the battery is safer. Technical expert Lu Languang once said that the negative electrode voltage requirement is relatively low when the battery is charged quickly, but if it is too low, the lithium ion battery will easily precipitate very active metallic lithium. This lithium ion not only conducts electricity, but also reacts with the electrolyte. Then it releases heat and generates combustible gas, causing a fire. The higher 1V voltage of lithium titanate prevents the negative electrode voltage from being zero, which indirectly prevents the precipitation of lithium ions, thereby ensuring the safety of the battery. Since the lithium titanate battery can be used safely in both high and low temperature environments, it also reflects its important advantage of wide temperature resistance (especially low temperature resistance). At present, the safe working temperature range of Yinlong lithium titanate battery is between -50°C and 65°C, while the energy of ordinary graphite negative battery starts to decay when the temperature is lower than -20°C, and the charging capacity is only at -30°C. It is 14% of the total charging capacity, and it cannot work at all in severe cold weather. In addition, even if the lithium titanate battery is overcharged, there is only a 1% volume change, so it is called a zero-strain material, which makes it have an extremely long life. Yinlong's chairman Wei Yincang once said that Yinlong's lithium-ion titanate battery has a lifespan of up to 30 years, which is equivalent to the life of a car, while the average life of ordinary graphite anode material batteries is only 3-4 years. From the perspective of the full life cycle, the cost of lithium-ion titanate batteries is lower. Commercial lithium-ion battery negative electrodes mainly use carbon materials, but lithium-ion batteries using carbon as negative electrodes still have some drawbacks in application: lithium dendrites are easy to precipitate when overcharged, causing battery short-circuits and affecting the safety performance of lithium-ion batteries; SEI film is easy to form, resulting in low charge and discharge efficiency and large irreversible capacity; that is, the platform voltage of carbon materials is low (close to metal lithium), and it is easy to cause the decomposition of electrolyte, which brings safety hazards; , The volume changes greatly during the extraction process, and the cycle stability is poor. Compared with carbon materials, spinel-type Li4Ti5O12 has obvious advantages: it is a zero-strain material with good cycle performance; the discharge voltage is stable, and the electrolyte does not decompose, which improves the safety performance of lithium-ion batteries; it is comparable to carbon anode materials. Compared with lithium titanate, it has a high lithium ion diffusion coefficient (2*10-8cm2/s), and can be charged and discharged at a high rate. The potential of lithium titanate is higher than that of pure metal lithium, and lithium crystal branches are not easy to appear, which provides a basis for ensuring the safety of lithium-ion batteries. The disadvantage is that the energy density is lower than other types of lithium-ion power lithium batteries; flatulence has always hindered the application of lithium titanate batteries; the price is relatively high compared to other types of lithium-ion power lithium batteries; there are still differences in battery consistency. With the increase of the number of charge and discharge times, the consistency difference of the new battery will gradually increase. 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: How to achieve the healthy development of the lithium-ion battery energy storage industry