Analysis of six major lithium battery materials

Six kinds of lithium battery pack materials will break the barriers: 1. Lithium titanate The advantages of lithium titanate are: long cycle life, zero strain material, no SEI in the traditional sense; high safety, high lithium insertion potential, no dendrite formation , Charge and discharge, high thermal stability; it can charge quickly. Disadvantages: The important factor restricting the use of lithium titanate is that the price is too high, which is higher than that of traditional graphite, and the capacity of lithium titanate in grams is very low, about 170mAh/g. As long as the processing technology is improved and the manufacturing cost is reduced, the advantages of long cycle life and fast charging of lithium titanate can be brought into play. Combining shopping malls and technology, lithium titanate is more suitable for buses and energy storage, without space requirements. 2. Graphene advantage: Since winning the Nobel Prize in 2010, graphene has attracted the attention of the world, especially in my country. Graphene has set off an upsurge in research and development in my country. It has excellent properties such as good light transmission, good electrical conductivity, high thermal conductivity, and high mechanical strength. As an additive for positive and negative electrodes, it can improve the stability of lithium battery packs, extend cycle life, and add internal conductivity. Disadvantages: Due to the immature mass production process, high price, and unstable function of graphene, graphene will be the first material to be used as a positive electrode and negative electrode additive for lithium battery packs. 3. Advantages of silicon-carbon composite anode material: As the future cathode material, silicon-carbon composite material has a theoretical gram capacity of more than 4200mAh/g, which is more than 10 times higher than the 372mAh/g of graphite cathode. Its industrialization will greatly Increase the capacity of the battery. Disadvantages: In the process of charging and discharging, the volume expansion can reach 300%, which will cause the capacity loss of silicon particles and materials. Poor ink absorption. The difference in cycle life. At present, these problems are being solved by means of nanometer silicon powder, silicon carbon coating and doping, and some companies have made certain progress. 4. The high capacity of lithium manganese-based anode materials is one of the expansion directions of lithium battery packs, but the energy density of lithium iron phosphate batteries is 580Wh/kg, and the energy density of nickel manganate lithium batteries is 750Wh/kg, both of which are relatively low . The theoretical energy density of lithium-rich manganese bases can reach 900Wh/kg, which has become a research hotspot. Lithium-rich manganese anode materials have the advantages of high energy density and abundant primary materials. Disadvantages: The first discharge power is very low, the material will release oxygen during the cycle, which is a high safety risk, the cycle life is very poor, and the multiplier function is low. But the potential is huge. 5. The application of diaphragm diaphragm is very important to the safety of lithium battery packs. It requires the diaphragm to have good electrochemical and thermal stability, as well as a high degree of electrolyte penetration during repeated charging and discharging. The purpose of the coated diaphragm is to promote the heat-resistant shrinkage of the diaphragm and prevent the diaphragm from shrinking to form a large-area short circuit; the low thermal conductivity of the coating material prevents the expansion of some thermal runaway points in the lithium battery package, forming an overall thermal runaway. Carbon nanotubes Carbon nanotubes have good electrical conductivity. Because of its small depth and short stroke when peeling off from lithium, as a negative electrode material, the polarization effect of the large multiplier is small during charging and discharging, which can promote the charging and discharging function of the lithium battery pack. With its unique hollow structure, high conductivity and large specific surface area as the carrier, it improves the electrical properties of other negative electrode materials. Defects: When carbon nanotubes are directly used as cathode materials for lithium batteries, problems such as large irreversible capacity, voltage lag, and unclear discharge channels will occur. The implementation of a series of related policies is also rising rapidly in new energy vehicles, power lithium batteries, charging piles and other related industries. I believe that with the improvement of energy storage technology in the next few years, the price standard of lithium batteries, power lithium batteries will meet Here comes a new industrial peak! Statement: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete the previous article: Is it true that the battery 'charges for more than 12 hours in the first three times'?