A functioned PP was chosen as a separator to suppress the shuttling effect of soluble polysulfide in lithium−sulfur batteries (LSBs). Nanocubic cobalt phosphide/carbon (CoP/C) was modified on PP membrane through a simple vacuum filtration method. This CoP/C-modified PP separator not only efficiently captures polysulfides through strong chemical affinity but also facilitates the conversion of the soluble intermediates due to the fast transfer at the interface. In consequence, the cell with a CoP/C-modified separator exhibits a lowcapacity decay of only 0.08% per cycle over 500 cycles at 1 C with an initial capacity of 938 mAh g −1 and a superior rate performance of 594 mAh g −1 at 4 C. Even with a high loading of 3.2 mg cm −2 , the cell still exhibits an excellent reversible capacity of 601.3 mAh g −1 after 100 cycles at 0.5 C. This work provides a new strategy to effectively restrict the polysulfide shuttling.
Carbon fiber (CF) is a promising material as carbon-based electrode and support for flexible supercapacitors. However, it still suffers from narrow voltage in the aqueous electrolyte due to the water decomposition (1.23 V). Herein, an aerobic pyrolysis is developed to recover aligned carbon fibers from carbon fiber reinforced polymers. More importantly, during this oxygen existence condition, the surface of reclaimed carbon fibers (RCFs) is etched into groove-shaped structure and modified by introducing abundant oxygen-containing functional groups, which significantly expands the negative potential window of RCFsbased electrode to −1.4 V (vs standard calomel electrode) and the working voltage of RCFs-based symmetric supercapacitor to 2.4 V in an aqueous electrolyte of 1.0 M Na 2 SO 4 , with capacitance retention of 90% and 93.6% after 10 000 cycles, respectively. This work well matches the aerobic pyrolysis of recovery of CFs from CFRPs and electrochemical performances of RCFs, supplying a new strategy to develop high-performance energy storage device.
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