Lithium titanate is used as a lithium-ion battery cathode material - lithium titanate, can be used with lithium manganate, ternary materials or lithium iron phosphate and other cathode materials to form a 2.4V or 1.9V lithium-ion secondary battery. In addition, it can also be used as a positive electrode, and lithium metal or lithium alloy negative electrode to form a 1.5V lithium secondary battery, but still not popularly used, this is why?
Lithium titanate batteries also have advantages.
Lithium titanate battery has a small size, light weight, high energy density, good sealing performance, no leakage, no memory effect, low self-discharge rate, rapid charging and discharging, long cycle life, a wide range of operating environment temperature, safe and stable green and other characteristics.
1, lithium titanate as anode material when the potential platform up to 1.55V, more than 1V higher than the traditional graphite anode material, although the loss of some energy density, but also means that the battery is safer.
2, as lithium titanate batteries can be used safely in high and low temperature environments, also reflects its important advantage of wide temperature resistance (especially low temperature resistance). At present, the safe working temperature region of Yinlong lithium titanate battery is between -50 degrees and 65 degrees, while the energy of ordinary graphite-based negative electrode battery starts to decay when the temperature is below -20 degrees, and the charging capacity is only 14% of the total charging capacity at -30 degrees, which simply cannot work properly in cold weather.
3, the last advantage of lithium titanate is the rapid charging and discharging capacity, high charging multiplier. At present, Yinlong lithium titanate battery charging rate of 10C, or even 20C, while the ordinary graphite anode material battery charging rate of only 2C-4C.
Although lithium titanate batteries have excellent safety performance which makes the research on lithium titanate ion batteries hot, the low electronic conductivity (10-13S/cm) and lithium ion diffusion coefficient (10-10~10-13cm2/S) of Li,Tis0: material itself greatly limit the application in large multiplier charge down. Nanosizing the particle size of Li,TiO can expand the effective reaction area and reduce the diffusion distance, which can significantly improve the multiplicity performance of the material. However, the process of nanosizing material particles is often difficult and requires high cost, which makes it difficult to achieve large-scale industrial production.
In addition, lithium titanate battery will occur in the cycle of continuous gas production, resulting in the bulging of the battery pack, especially at high temperatures, affecting the contact between the positive and negative electrodes, increasing the impedance of the battery and affecting the performance of the battery. This is one of the main obstacles limiting the widespread use of lithium titanate as an anode material in batteries.
Lithium titanate (LTO) material is used as anode material in batteries, due to its own characteristics, the interaction between the material and electrolyte and gas precipitation during the charging and discharging cycle reaction, so ordinary lithium titanate batteries are prone to flatulence, resulting in the bulging of the cell and a significant drop in electrical performance, which greatly reduces the theoretical cycle life of lithium titanate batteries. Test data shows that ordinary lithium titanate batteries will bloat after about 1500-2000 cycles, resulting in normal use, which is also an important reason to limit the large-scale application of lithium titanate batteries.
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