Carbonized MIL-101(Fe)-NH₂ as sulphur host for Li-S battery

A conductive host with high porosity can resolve the issues mentioned above. Porous materials with unique structure containing carbon are metal-organic frameworks (MOFs). MOFs are materials having metal ions on 'robust' framework with large surface area, modifiable pores, and cavities. This work deals with application of carbonized MIL-101(Fe)-NH₂ as a host for sulphur in Li-S batteries. It was proven that carbonized MIL-101(Fe)-NH₂ can be used as a conductive support for sulphur electrodes in Li-S batteries. The unique structure of MOF can efficiently mediate the redox reaction to stable structure of cathode and faster kinetic reaction. The initial discharge capacity at 0.5 C was 705 mAh g^-1 and after 200 cycles the specific capacity reached the value of 476 mAh g^-1 , which is 67.6 % of original discharge capacity. The efficiency during long-cycling was around 95 % with fading rate of 0.162 % per cycle. To sum up, it can be concluded that carbonized MOF MIL-101(Fe)-NH₂ is an appropriate support for sulphur and lithium polysulphides. The S + Super P + MIL-101(Fe)-NH₂ + PVDF electrode described in this work is a promising material for application in Li-S batteries. (authors)