Cathode materials for Li-S batteries
Metal oxide nanoparticles and free-standing porous carbon monolith can be synthesized through polymer assisted colloidal approaches. The well-defined nanostructures can be applied as cathode materials in Li-S batteries with excellent electrochemical performance. For example, Magnéli phase Ti4O7 particles with interconnected-pores structure can be synthesized by using porous PS-P2VP particles as template. They can provide mesopores for physical confinement and polar surface for chemically bonding with polysulfides to suppress their dissolution. Moreover, light-weight and mechanically stable carbon monoliths have been prepared from a hydrothermal method. This binder-free monolith have been used as model cathode material for a multidimensional operando analysis.