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Net-Structured Filter of Co(OH)2‑Anchored Carbon Nanofibers with Ketjen Black for High Performance Li–S Batteries
journal contribution
posted on 2018-11-06, 00:00 authored by Yuebin Yang, Leiting Zhang, Hui Xu, Xusong Qin, Yuanfu Deng, Guohua ChenLithium sulfur batteries
have been extensively explored in recent
years owing to their high theoretical energy density (∼2600
Wh kg–1), environmental benignity, and low cost
of raw materials. Besides the advanced sulfur cathode, various functional
separators/interlayers are also being developed as the effective inhibitor
of polysulfide diffusion. In this study, Co(OH)2-anchored
carbon nanofibers (CNFs) with Ketjen black (KB) dispersed in the void
were designed as a dense net-like structure (denoted as Co(OH)2@CNF/KB), which was coated at the surface of a typical commercial
separator to help inhibit polysulfide migration. It was demonstrated
that the Co(OH)2@CNF/KB-modified separator could effectively
increase the charge transfer of the cathode material, trap the dissolved
polysulfides, and help to reuse the sequestered active material. As
a result, the cell employing this functionalized separator and unmodified
sulfur-based electrode exhibits an initial specific capacity of 1394
mA h g–1 at 0.1 C, which converts to 84% utilization
of sulfur, and a capacity decay of 0.10% per cycle at 2 C for over
450 cycles. The unique design of Co(OH)2@CNF/KB provides
a promising modifying approach for future lithium batteries.