What is the principle of lithium titanate battery

Lithium titanate batteries are composed of positive and negative plates (the active material of the positive electrode is ternary lithium, and the negative electrode is lithium titanate), barriers, electrolytes, tabs, and stainless steel (aluminum alloy) shells. The positive and negative plates are the electrochemical reaction area, the barrier and the electrolyte supply the transmission channel of Li+, and the tabs play the effect of guiding the current. When the battery is charged, Li+ migrates from the ternary lithium material to the crystal surface, from the positive electrode plate material, enters the electrolyte under the effect of the electric field force, passes through the barrier, and then migrates through the electrolyte to the negative electrode lithium titanate The appearance of the crystal is then embedded in the negative lithium titanate spinel structure. At the same time, the electrons flow through the aluminum foil of the positive electrode, through the tab, battery pole, load, negative pole, and negative tab, to the aluminum foil electrode of the negative pole, and then flow to the lithium titanate negative pole through the conductor to balance the charge. When the battery is discharged, Li+ is deintercalated from the lithium titanate spinel structure, enters the electrolyte, passes through the barrier, and then migrates to the surface of the ternary lithium crystal through the electrolyte, and then reinserts into the ternary lithium crystal. Together with this, electrons flow to the aluminum foil electrode of the negative electrode through the conductor, flow to the aluminum foil electrode of the battery positive electrode through the tab, battery negative pole, load, positive pole, and positive tab, and then flow to the ternary lithium positive electrode through the conductor. To balance the charge. It can be seen that the basic principle of lithium titanate battery is that in the process of charging and discharging, the corresponding lithium ions are intercalated and released back and forth between the positive and negative electrodes to complete the charging and discharging of the battery and the power supply to the load. The charging and discharging diagram of the lithium titanate battery is shown in the figure. When the battery is charged, the positive electrode loses electrons, and lithium ions are extracted and inserted into the negative electrode; the negative electrode inserts lithium ions together to obtain electrons and become a lithium-rich state. The process of discharging is just the opposite. In the process of Li+ intercalation or deintercalation, lithium titanate (Li4TI5O12) is an ideal intercalation electrode material. Li+ penetration and deintercalation have almost no effect on the data structure, so it is called zero-strain data. It has an outstanding circulation function. There are two different molecular structures of lithium titanate: Li7TI5O12 and Li4TI5O12. The crystal structure of Li7TI5O12 and the crystal structure of Li4Ti5O12 are both spinel structure, and the lattice constant changes very little, and the volume change is also very small. It can guard against the back and forth expansion and contraction of the electrode material during the charge and discharge cycle to cause structural damage, and then improve the cycle function and service life of the electrode, reduce the attenuation of the capacity caused by the addition of the cycle number, and make the lithium titanate have an excellent cycle Features. 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: Briefly describe the research direction of lithium battery anode materials