NiMoO ₄ @NiWO ₄ electrode with honeycomb-like structure exhibits very good specific capacitance and cyclic stability than the NiMoO ₄ electrode.

Metal sulfides have attracted considerable interest owing to their notable electrochemical properties and multiple application areas, such as solar cells and supercapacitors (SCs). This paper describes the design and synthesis of nickel foams decorated with different metal sulfides, such as CoS/NF, CuS/NF, FeS/NF, and NiS/NF electrodes for SCs. The FeS/NF coral reef-like nanostructure exhibited outstanding electrochemical performance in SCs with a high specific capacitance (2007.61 F g⁻¹ at 2 A g⁻¹), good cycling stability (only 3% loss after 3000 cycles at 2 A g⁻¹), excellent rate capability (52.27% capacity retention at 20 A g⁻¹), and higher energy density (54.88 W h kg⁻¹ at a power density of 500 W kg⁻¹) compared to other electrodes. The elevated performance of the FeS/NF was attributed mainly to the coral reef-like nanostructure with a relatively high specific surface area, which offers a large interfacial area between the electrode and electrolyte and sufficient physical cavities for rapid ionic diffusion. These results suggest that the coral reef nanostructure can be used not only in large energy density applications, but also in large power density fields, such as energy storage devices, flexible electronics, and electric vehicles.

Metal sulfides have attracted considerable scrutiny compared to metal oxides owing to their distinguished electrochemical properties and various applications, such as solar cells and supercapacitors. We have reported the pseudocapacitive properties of morphology-tuned NiS nanostructures using a hydrothermal method at different deposition times and temperatures. The surface morphology, structure, and chemical composition have been confirmed by SEM, TEM, XRD, XPS and EDS analyses. The optimized NiS-2 h electrode offers extra conductive paths on nickel foam, yielding a lower charge-transfer resistance and internal resistance than those of NiS-1 h and NiS-3 h. An investigation of its electrochemical properties indicates that the NiS electrode exhibited a specific capacitance of 1073.8 F g⁻¹ and 959 F g⁻¹ at current densities of 1.2 and 2.4 A g⁻¹ in KOH solution, indicating its potential to be used in practical applications. Moreover, it delivered a maximum energy density of 23.19 W h kg⁻¹ and a power density of 243.9 W kg⁻¹ with an excellent cycling retention of 89% after 1000 charge–discharge cycles. This work also indicates an effective approach for the fabrication of high-performance electrodes in a cost-effective manner for higher energy density and power density applications, such as electric vehicles, flexible electronics, and energy storage devices.

Prussian blue and Prussian blue analogues have attracted increasing attention as versatile framework materials with a wide range of applications in catalysis, energy conversion and storage, and biomedical and environmental fields.

This paper introduces a novel approach for rapidly balancing lithium-ion batteries using a single DC–DC converter, enabling direct energy transfer between high- and low-voltage cells. Utilizing relays for cell pair selection ensures cost-effectiveness in the switch network. The control system integrates a battery-monitoring IC and an MCU to oversee cell voltage and ensure battery protection. A prototype circuit with twelve lithium-ion batteries demonstrates the method’s efficacy, achieving a remarkable balancing time of 48 min during charging with a maximum efficiency of 89.85%. Comparative analysis with other methods underscores the superior performance of the proposed balancing circuit in terms of balancing time and implementation cost. Furthermore, this paper delves into hardware aspects of battery management systems (BMSs) for electric vehicles and stationary applications. It offers an overview of prevailing concepts in state-of-the-art systems, aiding readers in assessing considerations essential for BMS design in various applications. The discussion includes examples of battery packs sourced from commercially available electric vehicles. Subsequently, the manuscript addresses implementation aspects concerning the measurement of critical physical variables such as voltage, current, and temperature, alongside balancing strategies.

All-solid-state batteries offer secure energy storage. Nanomaterials boost performance, but challenges include reducing electrolyte size while maintaining conductivity. This review highlights recent advances in electrode-electrolyte interfaces.