The composite cathode was successfully prepared by a combination of spray pyrolysis and wet ballmilling with heat-treatment. The composite cathode had narrow particle size distribution with an average particle size of 99 nm. The Mg doping on the Mn site led to the electrochemical performance enhancement of the composite cathode, which was confirmed by cyclic voltammetry, ac impedance spectroscopy, and charge–discharge tests. The Mg-doped composite cathode exhibited a high discharge capacity in lithium cell, which remarkably increased with an increase in the charge cutoff voltage under galvanostatic charge–discharge. The cathode exhibited a discharge capacity of (above 93% of the theoretical value) at 0.1C when charge–discharged galvanostatically to 4.9 V. Along with enhanced discharge capacity, the cell exhibited a good rate capability under the galvanostatic charge–discharge. Under the trickle mode conditions, the cell exhibited discharge capacities of 154, 136, 106, and at 0.05, 0.1, 1, and 5C, respectively.

Reaction mechanisms of stoichiometric CuS and its improved properties were demonstrated by using a CFP interlayer to trap Li₂S_x.

The growing energy demand leads to the excessive combustion of fossil fuels and contributes to CO₂-induced global warming. On the other hand, new sustainable energy solutions require the development of advanced functional materials. Carbon composite nanofibers are attractive functional materials for a wide range of applications, including energy storage and conversion, sensing, catalysis, water filtration, drug delivery, gas separation, and tissue engineering, owing to their unique properties, such as a high surface area to volume ratio, excellent chemical resistance, superior electrical and thermal conductivity, and mechanical stability. Electrospinning coupled with heat treatment is an inexpensive and straightforward technique that allows the homogeneous mixing of precursor salts at the molecular level, easy functionalization of fibers, a combination of materials, and deposition of fibers onto other substrates. This review focuses on polyvinylpyrrolidone (PVP) as a sole carbon source without any additional polymers for composite nanofibers prepared by electrospinning with subsequent heat treatments. We discuss the main production parameters affecting the morphology and structure of prepared composites and summarize them by applications. The advantages and challenges of using PVP as a carbon source are highlighted by classifying the designed materials as electrodes for lithium-ion batteries and other energy storage systems, semiconductors, and beyond.