What is the effect of lithium titanate as the negative electrode of lithium batteries?

The low Li diffusion coefficient and low conductivity (10-10S/cm) of pure-phase lithium titanate lead to the rapid capacity decay of polymer lithium batteries during high-current rapid charging and discharging, so its modification is very necessary. Modification methods of lithium titanate include nanometerization, morphology control, carbon coating, metal doping, and nitriding solution. Lithium titanate is a composite oxide composed of transition metal titanium and low-potential metal lithium. It is a member of the solid solution system. Its crystal structure is spinel, the spatial lattice group is Fd3m, and the unit cell parameter is 0.836 nm has a three-dimensional lithium ion diffusion channel. Controlling the morphology of lithium titanate and nano-materials can improve the ionic conductivity and electronic conductivity, but the nanoparticles are easily agglomerated during the cycle, which will have a negative impact on the cycle stability, so how to obtain relatively stable spherical nanoparticles Materials and how to solidify this structure is the focus of research in the direction of particle nanometerization. The carbon coating modification method is based on physically blocking the agglomeration of nanoparticles and increasing the surface conductivity of the particulate material, that is, a layer of conductive phase is overturned on the surface of the titanic acid anode material. Lithium titanate is used as a negative electrode material for lithium batteries, and its preparation methods are mainly high-temperature homogeneous method, hydrothermal method and sol-gel method. The modification of lithium titanate materials is of great significance for the improvement of its performance at high rates. The level can increase the specific surface of the material and increase the reaction surface with the electrolyte. The composite of carbon material and lithium titanate can improve the conductivity of the lithium titanate material. The composite of graphene material and lithium titanate can obtain a composite material with good electrochemical performance. Appropriate metal-doped lithium titanate crystal will improve its electrical conductivity. Nitriding solution does not clearly change the crystal structure of lithium titanate, maintains the zero-strain characteristics of lithium titanate material, and can significantly improve the electrical conductivity and ionic conductivity. Excellent capacity performance and cycle performance at high rates. In actual use, several modification methods should be combined and appropriate preparation methods should be adopted, from the aspects of bulk doping, surface structure optimization, and material particle morphology and size. Comprehensive design and consideration. 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 post: Who is better than lithium batteries for lead-acid batteries?