AUTHOR=Meng Ling , Sun Zhaoxia , Sun Guanghang , Zhang Xiting , Dan Meng , Long Jin , Hu Jian 

TITLE=The effect of different poly fibers separator-modified materials on blocking polysulfides for high performance Li-S batteries

JOURNAL=Frontiers in Chemistry

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.931201

DOI=10.3389/fchem.2022.931201

ISSN=2296-2646

ABSTRACT=<p>Herein, we reported that KOH impregnation can generate a large number of porous structures with fruitful nitrogen self-doped groups during the carbonized process for poly (<italic>p</italic>-phenylene terephthalamide) fiber and poly (<italic>p</italic>-phenylene benzobisoxazole) fiber (denoted as PPTA and PBO, respectively). The intrinsical insulation, volume change, and shuttle effect of polysulfides then can be more significantly improved for the PBO-coated separator than the PPTA case. The discharge capacity primary achieves 1,322 mA h/g, which retains 827 mA h/g even after 200 cycles at 0.2 C for the cell with PBO-coated separator. The reversible specific discharge capacity maintains 841 mA h/g with a Coulomb efficiency of 99.7% at 5 C. The nitrogen self-doped nanocarbon particles are etched by KOH with the simple one-step preparation, which has promising application as Li-S battery cathode.</p>