Highly wrinkled NiO nanosheet-based hierarchical structure/reduced fluorographene composite for enhanced performance of lithium-sulfur battery

摘要

The practical application of Li-S batteries remains a challenge because of capacity decay and polysulfide shuttle. This paper reports a highly wrinkled NiO nanosheet-based hierarchical structure that can efficiently restrain the polysulfide shuttle via physical and chemical confinement. Reduced fluorographene-NiO/S (RFG-NiO/S) composites are also prepared by hydrothermal method and thermal treatments. In comparison with NiO/D and RFG/S, the developed hybrid composite of RFG-NiO/S exhibits better initial reversible discharge capacity of 995 mAhg(-1), retains 640 mAhg(-1) after 110 cycles at 0.1 C, and shows the specific capacity of 381 mAhg(-1) at the higher current rate of 0.5 C after 200 cycles. (C) 2020 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.