Improving the polysulfide barrier by efficient carbon nanofibers coating on separator/cathode for Li-S batteries

GARCÍA-SORIANO, FRANCISCO J.; PARA, M. LAURA; LUQUE, GUILLERMINA L.; BARRACO, DANIEL; LEIVA, EZEQUIEL P. M.; LENER, GERMAN

JOURNAL OF SOLID STATE ELECTROCHEMISTRY (PRINT)

SPRINGER

Año: 2020 vol. 24 p. 2341 - 2351

1432-8488

High-power high-density lithium rechargeable batteries are necessary to meet the energy demand of electric vehicles and high-power stationary grids. Here, we present a straightforward method for obtaining carbon nanofibers (CNFs) as a polysulfide barrier in Li-S cells, resulting in a significant increase in cell performance. CNFs were coated both on the separator and on the cathode. The CNF-coated cathode showed a specific capacity of 1010 mA h g−1 after 250 cycles at 0.2 C, with a capacity fading of 0.021% per cycle. In addition, at 1 C, it delivered 946 mA h g−1, thus presenting a fast Li+ transport with a good capacity. This result turns CNFs-coated cathodes into a promising system for obtaining high-performance Li-S cells. [Figure not available: see fulltext.].