Analysis of the structural composition and advantages and disadvantages of lithium titanate batteries

The structure of the lithium titanate battery consists of the positive electrode: lithium iron phosphate, lithium manganate or ternary materials, lithium nickel manganate. Negative electrode: lithium titanate material. Barrier: Lithium battery barrier with carbon as negative electrode. Electrolyte: Lithium battery electrolyte with carbon as the negative electrode. Battery case: Lithium battery case with carbon as negative electrode. Advantages of lithium titanate battery Lithium titanate battery has small size, light weight, high energy density, good sealing function, no leakage, no recall effect, low self-discharge rate, quick charge and discharge, long cycle life, and operating environment temperature scale Wide, safe, stable, green and environmentally friendly, 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 path 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 more safe. Skills expert Lu Languang once pointed out that when the battery is fast charging, the negative electrode voltage demand is relatively low, but if it is too low, the lithium battery will simply separate the very vivid metal lithium. This lithium ion not only conducts electricity, but also reacts with the electrolyte. Then the heat is released and combustible gas is generated, causing a fire. The lithium titanate guards the negative voltage of 0 due to the higher voltage of 1V, which indirectly guards the separation of lithium ions, and then ensures 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 advantages of wide temperature resistance (especially low temperature resistance). At present, the safe operating temperature range of Yinlong lithium titanate battery is between -50°C and 65°C, while the general graphite negative electrode battery begins to decay when the temperature is lower than -20°C, and the charging capacity is only at -30°C. 14% of the total charging capacity, it cannot work normally in cold weather. In addition, even if the lithium titanate battery is overcharged, there is only a 1% volume change, which is called a zero-strain material, which makes it have an extremely long life. Yinlong's chairman Wei Yincang once stated that Yinlong's lithium titanate battery has a lifespan of up to 30 years, which is equivalent to the service life of a car, while the average lifespan of a general graphite anode material battery is only 3-4 years. From the perspective of the full life cycle, the cost of lithium titanate batteries is lower. The last advantage of lithium titanate is that it is capable of fast charging and discharging, and the charging rate is high. At present, the charging rate of Yinlong lithium titanate battery is 10C or even 20C, while the charging rate of the battery of general graphite anode materials is only 2C-4C. Based on these technical characteristics of lithium titanate batteries, the industry believes that it meets the needs of new energy buses and large-scale energy storage equipment. The shortcomings of lithium titanate batteries but the best safety features make the research on lithium titanate batteries popular, but the lower electronic conductivity (10-13S/cm) and lithium ion diffusion coefficient (10-10~ 10-13cm2/S) greatly restricts the application under high-rate charging and discharging. Some scholars have shown that nano-sized particles of Li4Ti5O12 can expand the effective response area and reduce the diffusion distance, and then clearly improve the magnification function of the data. However, the needs point out that the process of nano-materialization of data particles is often difficult and requires higher costs. At present, it is difficult to achieve large-scale industrial production. Lithium titanate batteries will continue to produce gas during cycling, causing the battery pack to swell, which is particularly serious at high temperatures, which affects the contact between the positive and negative electrodes, adds battery impedance, and affects the function of the battery. This is also one of the primary obstacles restricting the widespread use of lithium titanate as a negative electrode material in batteries. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: About the passive and active balancing of the iron-lithium battery protection board