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With the rise of flexible electronics, the demand for advanced power sources has grown. Developing high-performance energy storage devices requires comprehensive consideration of various factors such as electrodes, electrolytes, and service conditions. Herein, a data-driven research framework is proposed to optimize the electrode-electrolyte system in supercapacitors. With the help of machine learning, we reveal the key factors affecting the capacitance performance of carbon-based materials. According to the algorithm analysis, a kind of 3D carbon network is prepared with controlled composition and structure, which is incorporated with a high-safety ionic liquid to obtain a supercapacitor device. This device with high energy density and impressive flexibility can maintain operational stability under extreme conditions such as humidity, shock, and localized damage. Overall, this work presents a typical pipeline for accelerating the design of energy-related devices. [Display omitted] • A data-driven design framework for energy storage devices is proposed. • Machine learning is used to investigate the key features of electrode materials. • An ultra-thin flexible supercapacitor device with high safety is fabricated. [ABSTRACT FROM AUTHOR]

Aqueous secondary Zn–Ni batteries have attracted extensive attention as a potential candidate to meet the increasing demand for energy storage device since they are environmental friendly and can provide inherent safety, high energy density and power density. However, the uneven deposition, passivation and corrosion of ZnO anode severely reduce the cycling life of the battery. Herein, tetraethylammonium bromide (TEAB) and polyethylene oxide (PEO) are introduced into the battery as electrolyte additives. The Zn–Ni battery achieves an excellent cycling life of 450 h since the additives provide more reduction sites and hinder the formation of dead zinc. In addition, the electrolyte additives can also reduce the corrosion current density of the anode and maintain the stable cycle of the battery under floating charge mode for more than 40 days. These results confirm the great practical application potential of aqueous Zn–Ni battery. • Tetraethylammonium bromide and polyethylene oxide are used as electrolyte additives. • The electrolyte additives effectively increase the reduction sites of zinc. • The batteries exhibit better cyclic stability and floating charge performance. [ABSTRACT FROM AUTHOR]

The rational design and synthesis of hybrid-type electrode nanomaterials are of significant importance for their diverse applications, including their promising usage as high-efficiency nanoarchitectures for supercapacitors (SCs) as a class of promising energy-storage systems for powering next-generation electric vehicles and electronic devices. Here, we report a regulated synthesis of eutectic structured Ni 3 S 2 /NiS nanorods, which is demonstrated to have fantastic electrochemical performance as a freestanding electrode for hybrid SCs. The as-prepared Ni 3 S 2 /NiS significantly increases the interfacial atomic activity between Ni 3 S 2 and NiS, which provides more electrochemical active sites and facilitates fast ion diffusion. The Ni 3 S 2 /NiS electrode presented superior areal specific capacity of 1330 μA h cm−2 and remains 67.1% of its initial capacity when the current density increased 20 folds. The as-assembled hybrid supercapacitor demonstrated fantastic energy density of 0.567 mWh cm−2@4.251 mW cm−2, and retained at 0.476 mWh cm−2@34.440 mW cm−2 with long durability. This study provides a facile pathway to rationally design a variety of eutectic structured metal compounds for high performance energy storage devices. Image 1 • Eutectic Ni 3 S 2 /NiS nanorods with enriched grain boundaries are synthesised. • Ni 3 S 2 /NiS exhibits abundant active sites and enhanced electronic conductivity. • The synergistic effect contributes to improved electrochemical performance. • Ni 3 S 2 /NiS exhibits high specific capacity, superior rate capability and stability. [ABSTRACT FROM AUTHOR]

A novel, boltless and easily assembled zinc–air battery configuration is developed to compare with the conventional configuration commonly used in most academic studies. A zinc–air battery with a boltless configuration can fundamentally avoid the man-made leakage risk by sealing the internal environment via mechanical fasteners on the battery body and enhancing the cell capacity by modifying the battery configuration. The volume energy density and the mass energy density of zinc–air battery stacks with five zinc–air batteries in series are 117.3 Wh L−1 and 68.0 Wh kg−1, respectively, both exceeding those of commercial lead-acid batteries. This study simulates the static and dynamic application of zinc–air battery stacks as a power supply for an electric motorcycle and a single flow battery energy storage unit, showing high commercial application potential in mobile power supply and scale energy storage. Image 1 • A boltless zinc–air battery configuration with good sealing effect is developed. • Man-made leakage risk of zinc–air battery caused by uneven stress is avoided. • Developed configuration has higher mass efficiency than conventional configuration. • Developed zinc–air battery has greater energy density than lead-acid batteries. • Potential of zinc–air batteries in electric motorcycle is demonstrated. [ABSTRACT FROM AUTHOR]