Machine Learning Driven Optimization of Electrolyte for Highly Reversible Zn-Air Batteries with Superior Long-Term Cycling Performance.

Aqueous alkaline Zn-air batteries (ZABs) have garnered widespread attention due to their high energy density and safety, however, the poor electrochemical reversibility of Zn and low battery round-trip efficiency strongly limit their further development. The manipulation of an intricate microscopic balance among anode/electrolyte/cathode, to enhance the performance of ZABs, critically relies on the formula of electrolytes. Herein, the Bayesian optimization approach is employed to achieve the effective design of optimal compositions of multicomponent electrolytes, resulting in the remarkable enhancement of ZAB performance.

CoO/CuO Hybrid Hollow Microspheres as Long-Cycle-Life Lithium-Ion Battery Anode.

CoO/CuO hybrid hollow microspheres have been successfully prepared via thermal decomposition of CoCu glycolates, whose size can be adjusted by varying the molar ratio of Co/Cu. As lithium-ion battery (LIB) anode, CoO/CuO microspheres exhibited excellent electrochemical performance due to synergistic effects and the hollow structural design, the best CoO/CuO sample could maintain a high specific capacity of 1170.4 mAh g after 300 cycles at 1 A g, and still retain a capacity of 514.

The Key Role of N/S Codoped Carbon Dots in Efficient Capture and Conversion of Lithium Polysulfides.

The dissolution and shuttle of lithium polysulfides (LiPSs) should be primarily responsible for rapid capacity decay in lithium-sulfur batteries (LSBs), which severely limits sulfur utilization. Introduction of cathode additives that can immobilize and rapidly convert LiPSs has been identified as effective in alleviating the shuttle effect. In this study, N/S codoped carbon dots (NSCDs) have been synthesized via a typical hydrothermal method, whose surfaces are rich in polar functional groups (─COOH, ─OH, ─SO and ─NH) to capture LiPSs and effectively modulate the deposition behavior of LiS.