@article{6614, author = {Liwen Ji and Mumin Rao and Shaul Aloni and Lei Wang and Elton J Cairns and Yuegang Zhang}, title = {Porous carbon nanofiber{\textendash}sulfur composite electrodes for lithium/sulfur cells}, abstract = {

Sulfur (S) encapsulated in porous carbon nanofibers (CNFs) was synthesized viaelectrospinning, carbonization and solution-based chemical reaction{\textendash}deposition method. The chemical reaction{\textendash}deposition strategy provides intimate contact between the S and the CNFs. This would not necessarily be the case for other reported methods, such as ball milling and thermal treatment. These novel porous carbon nanofiber{\textendash}sulfur (CNF{\textendash}S) nanocomposites with various S loadings showed high reversible capacity, good discharge capacity retention and enhanced rate capability when they were used as cathodes in rechargeable Li/S cells. We demonstrated here that an electrode prepared from a porous CNF{\textendash}S nanocomposite with 42 wt\% S maintains a stable discharge capacity of about 1400 mA h g-1 at 0.05 C, 1100 mA h g-1 at 0.1 C and 900 mA h g-1 at 0.2 C. We attribute the good electrochemical performance to the high electrical conductivity and the extremely high surface area of the CNFs that homogeneously disperse and immobilize S on their porous structures, alleviating the polysulfide shuttle phenomenon. SEM measurements showed that the porous CNF structures remained nearly unchanged even after 30 cycles{\textquoteright} discharging/charging at 0.05 C.

}, year = {2011}, booktitle = {Energy \& Environmental Science}, journal = {Energy \& Environmental Science}, series = {Energy \& Environmental Science}, volume = {4}, number = {12}, pages = {5053-5059}, month = {10/2011}, doi = {10.1039/C1EE02256C}, language = {eng}, }