Hits:

Indexed by:期刊论文

Date of Publication:2016-08-31

Journal:ACS APPLIED MATERIALS & INTERFACES

Included Journals:Scopus、SCIE、EI、PubMed

Volume:8

Issue:34

Page Number:22261-22269

ISSN No.:1944-8244

Key Words:lithium-sulfur battery; sulfur cathode; electronic conductivity; ketjen black; porous carbon; sodium alginate

Abstract:A highly conductive sulfur cathode is crucial for improving the kinetic performance of a Li-S battery. The encapsulation of sulfur in porous nanocarbons is expected to benefit the Li+ migration, yet the e(-) conduction is still to be improved due to a low graphitization degree of a conventional carbon substrate, especially that pyrolyzed from carbohydrates or polymers. Aiming at facilitating the e(-) conduction in the cathode, here we propose to use ketjen black, a highly graphitized nanocarbon building block to form a conductive network for electrons in a biomass-derived, hierarchically porous carbon sponge by a, easily scaled-up approach at a low cost. The specifically designed carbon host ensures a high loading and good retention of active sulfur, while also provides a faster electron transmission to benefit the lithiation/delithiation kinetics of sulfur. The sulfur cathode prepared from the carbon network shows excellent cycling and rate performance in a Li-S battery, rendering its practicality for emerging energy storage opportunities such as grids or automobiles.