This work demonstrated the potential of the FeCoP-NCS composite to be employed as an LSB electrode material with high-rate performance and long-term cycle stability. Meanwhile, an excellent cycling performance with a capacity decay rate of 0.07% per cycle was observed for 500 cycles at 1C. The assembled LSBs with the cathode displayed a high capacity of 406 mA h g −1 at 5C current density. The NCS substrate matrix with large specific surface area and high porosity provided the necessary channels for electron and ion transport. In order to resolve engineering problems that the performance of the traditional blind source separation (BSS) methods deteriorates or even becomes invalid when the unknown source signals are interfered by impulse noise with a low signal-to-noise ratio (SNR), a more effective and robust BSS method is proposed. In comparison with the other sulfur hosts reported in the literature, the optimal FeCoP-NCS sulfur host exhibited a fantastic bidirectional catalytic effect by greatly accelerating sulfur reduction during discharge and Li 2S oxidation during charging. In this study, an FeCoP quantum dot (FeCoP-QD)-decorated nitrogen-doped carbon nanosheet (FeCoP-NCS) composite was prepared as a sulfur host for LSBs.

Using polysulfide electrocatalysts has become an effective strategy to improve the durability of lithium–sulfur batteries (LSBs) by regulating the precipitation and dissolution of lithium sulfide in the electrolyte.

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