Will the cathode material have an impact on the life of the lithium battery?

Does the cathode material affect the life of lithium batteries? The battery cathode material of lithium batteries is one of the primary conditions for determining the life of lithium batteries. The current commercial lithium battery generally chooses the battery cathode material to be laminated LiCoO2, spinel-like LiMn2O4, malachite-like LFP, etc. The rapid volume decay coefficient of lithium batteries has always been a difficult problem in the scientific research on the service life of lithium batteries. Many elements are the connection points that will harm the rapid volume decay coefficient. This poses a very big challenge to the life prediction of lithium batteries. To understand the reason for the volumetric cliff-type attenuation coefficient, and to include this element in the life prediction entity model, it is difficult to do a good job of the prediction model, and the need to integrate business processes and technology is again emphasized. In the past ten years, although the battery cathode materials of lithium batteries are all lithium bridge hydroxides, the problem of melting transition elements has always been a difficult point, especially LiMn2O4 spinel positive stage. In the whole process of long-term or high-temperature storage, the volume is usually There will be a significant attenuation coefficient. Among them, the melting of manganese ions is one of the most important reasons, especially when acid attacks LiMn2O4 caused by adverse reactions, manganese ions can be dissolved in the lithium battery electrolyte. The electrolyte solution air oxidation is converted into hydroxide ions, and when the working voltage is too high, it is converted into hydrochloric acid, which accelerates the disproportionation reaction of manganese. The solubility increases with the change of height and phase difference in the whole process of the circulation system; when manganese ions dissolve the lithium battery Several types of relative conditions occurred when the electrolyte was in, including structural instability, outflow of active material, and enlarged resistors. Lithium iron phosphate has a spinel structure, which can consider the need to de-intercalate lithium batteries. However, the Mn in the raw materials is soluble in the lithium battery electrolyte at high temperatures, resulting in damage to the irreversible working ability of the lithium battery electrolyte. In addition, when charging and discharging at high temperatures, raw materials are prone to Jahn-Teller effect, which damages the crystal structure of specific raw materials and accelerates the battery power attenuation coefficient. LFP is a malachite-like structure, with very good reliability and safety factor. The external diffusion characteristic impedance is slightly improved, and the European mother characteristic impedance and electrochemical corrosion characteristic impedance are newly added. Among them, the photoelectric catalytic characteristic impedance increases. ***Big. The key to the loss of capacitors comes from the adverse reactions of the electrical level and the electrolyte of the lithium battery. Among them, the specific lithium loss is the key to the loss of the capacitor. The SEI causes the loss of the capacitor due to the transformation of the negative stage volume in the whole process of the circulation system. Lithium cobalt oxide is a laminated structure, which can ensure the level and interweaving of the structural transformation during the whole process of Li+ deintercalation and insertion. Under the polymer battery standard, battery charging will continue to endanger the service life of the lithium battery and the charging and discharging rate The increase in Zn will cause the mixing of Li+ and Co molecules, causing a part of LiCoO2 to change from a hexagonal crystal structure to a cubic meter crystal structure. The growth of the battery cathode material structure will cause the volume attenuation coefficient. With the use of lithium batteries, the total number of lithium batteries in the internal lithium battery electrolyte slowly decreases. In addition, because the convective heat transfer capacity of lithium batteries decreases, the battery power attenuation coefficient is also caused. The outflow of active lithium batteries is mainly due to the continuous consumption of the reaction between the lithium battery electrolyte and the active materials with positive and negative levels in the whole process of the circulation system. With the increase in the frequency of the circulatory system, the positive-stage characteristic impedance has risen significantly while the negative-stage characteristic impedance has not changed significantly, while the negative-stage volume has been drastically reduced while the positive-stage characteristic impedance has not changed significantly. Because of the increase in the characteristic impedance of the positive page and the damage of the negative volume, the battery power decreases during the entire cycle of the system. Because of its large volume ratio energy, high quality ratio energy, high working standard voltage, high lithium battery life and low efficiency, and no memory, lithium batteries have been widely used in consumer electronic devices, along with the expansion of critical uses of lithium batteries , It clearly puts forward higher regulations on its characteristics. Under high temperature, the volume attenuation coefficient of lithium batteries is faster, the low multiple characteristics are poor, and the high life speed of lithium batteries is more serious and restricts its use. 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 article: Structural design principles of high-rate lithium battery packs