No abstract

The depletion of fossil fuels and environmental pollution provide an increasing requirement for rechargeable batteries with high energy densities, high efficiency, and excellent cycling performance. Aqueous rechargeable batteries (ARBs), with the merits of safety, low‐cost, super‐fast charge‐discharge ability, and environmental friendliness, are one of the most competitive technologies for large‐scale energy systems. Recently, extensive efforts have been dedicated to enhancing their electrochemical performance, and great breakthroughs have been achieved, especially for aqueous rechargeable lithium batteries (ARLBs), including three generations of ARLBs, aqueous rechargeable sodium batteries (ARSBs), and redox flow batteries (RFBs). Herein, the latest advances on their critical components are reviewed, and challenges and further directions are also pointed out.

No abstract

The quasi-solid-state Li-ion capacitor demonstrates an ultrahigh energy density of 110 W h kg−1and rapid charge/discharge capability within 2 min.

The zinc-bromine redox flow battery (ZBB) is an ideal device of energy storage systems. Nevertheless, its energy density is relatively low compared to those of Li-ion batteries, due to its low output voltage. Herein, a high-voltage aqueous hybrid zincbromine battery system (AHZBBs) was developed, where K + -conducting membrane was used to segregate neutral-alkaline hybrid electrolytes and redox couples of Br 2 /Br À and [Zn(OH) 4 ] 2À / Zn at the positive and negative electrode. Benefited from an efficient and stable cathode catalyst (carbon-manganite nanoflakes), this AHZBB delivered a high average output voltage of 2.15 V and energy density of 276.7 Wh/kg without capacity attenuation after 200 cycles. More importantly, this work provides an efficient avenue to elevating the output voltage and energy density, and will strongly encourage studies on redox flow batteries.[a] Dr.