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论文类型：期刊论文
发表时间：2016-08-31
发表刊物：ACS APPLIED MATERIALS & INTERFACES
收录刊物：Scopus、SCIE、EI、PubMed
卷号：8
期号：34
页面范围：22261-22269
ISSN号：1944-8244
关键字：lithium-sulfur battery; sulfur cathode; electronic conductivity; ketjen black; porous carbon; sodium alginate
摘要：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.