New product recommendation: Low MI Titanium Diboride powder

 

The structure of TiB2 and MgB2 is similar to a typical hexagonal crystal system, showing a layered structure, and Ti-B between layers is an ionic bond. Therefore, TiB2 has high electrical conductivity, far exceeding that of activated carbon and porous graphitic carbon. Li et al. synthesized titanium boride (TiB2) nanoparticles by hydrolysis-assisted method of magnesium metal as a positive sulfur-fixing carrier for Li-S batteries. The excellent electrical conductivity of TiB2 provides an effective way for charge transfer at the TiB2/S interface. It is confirmed by DFT calculation and XPS spectrum that a large number of Ti atoms on the surface of TiB2 are highly coordinatively unsaturated, have abundant dangling bonds, and have strong interactions with elemental sulfur. After TiB2 comes into contact with sulfur, self-sulfurization occurs, and the surface acts as an anchoring surface to interact with lithium polysulfides in the electrochemical reaction, resulting in double chemical interaction S-S and S-Li bonds.

 

Metal borides have unique physical and chemical properties. As a positive electrode carrier material for Li-S batteries, their sulfur fixation/catalysis mechanism needs to be clearly analyzed, so as to improve the performance of metal boride materials under the condition of high sulfur loading in lean electrolytes from all directions and from multiple perspectives. Based on the conversion reaction kinetics and long-term cycle stability, a metal boride cathode carrier material with high sulfur loading, low liquid sulfur ratio, high specific energy, and long cycle has been developed, thereby promoting the practical application of Li-S batteries.