According to foreign media reports, the research team of KAIST has developed an ultra-stable, high-rate lithium sulfur battery, and the team has applied hierarchically porous titanium nitride (h-tin) as the sulfur surface carrier (sulfur host). The research team wrote in the paper, when the environment temperature is 5 ℃, the battery charge and discharge after 1000, h - reversible capacity of TiN/S (reversible capacity) is about 557 mAh/g, the recession after each charge and discharge capacity of the conversion rate is only 0. 016%.
In response to this kind of problem, professor of chemical and biomolecular engineering Jinwoo Lee and his team relatively developed multistage aperture/synthesized mesoporous titanium nitride (hierarchical macro/mesoporous titanium) as the carrier materials of sulfur (host material for sulfur)。
Titanium nitride has a high sulfide affinity and high conductivity, which can prevent the dissolution of active materials and provide assistance for charge transfer. In addition, big pore and the synergistic effect of mesoporous structure can be stable for a lot of sulfur, as the electrode penetration (electrolyte penetration) to provide assistance.
It has been mentioned in previous reports that polar inorganic materials have a high sulfuration affinity, but their ability to control the porous structure of sulfur carriers is inadequate. Now, the research has developed new synthetic approaches that allow easy control of inorganic materials in porous architectures, breaking through these technical limitations to achieve excellent cycle (charge and discharge) stability and high charging rates.