Gayea Hyun, Myeong Hwan Lee, Haodong Liu, Shen Wang, Zeyu Hui, Victoria Petrova, Ping Liu
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引用次数: 0
Abstract
Rechargeable Li-SO2 batteries offer low-cost, high-energy density benefits and can leverage manufacturing processes for the existing primary version at a commercial scale. However, they have so far only been demonstrated in an "open-system" with continuous gas supply, preventing practical application. Here, the utilization and reversibility of SO2 along with the lithium stability are addressed, all essential for long-life, high-energy batteries. The study discovers that high SO2 utilization is achievable only from SO2 dissolved in electrolytes between the lithium anode and carbon cathode. This results from a unique osmosis phenomenon where SO2 consumption increases salt concentration, driving the influx of organic solvents rather than SO2 from outside the current path. This insight leads to configure a bobbin-cell with all electrolytes between the electrodes, realizing nearly 70% of SO2 utilization, > 12x greater than in conventional coin cells. To improve reaction rate and SO2 reversibility, triphenylamine is employed to the electrolyte, creating an electron-rich environment that alleviates the disproportionation of discharge products. Incorporating this additive into a bobbin-cell with a lithium protective layer yields a cell with a projected energy density exceeding 183.2 Wh kg-1. The work highlights the potential of Li-SO2 batteries as affordable, sustainable energy storage options.
期刊介绍:
Advanced Science is a prestigious open access journal that focuses on interdisciplinary research in materials science, physics, chemistry, medical and life sciences, and engineering. The journal aims to promote cutting-edge research by employing a rigorous and impartial review process. It is committed to presenting research articles with the highest quality production standards, ensuring maximum accessibility of top scientific findings. With its vibrant and innovative publication platform, Advanced Science seeks to revolutionize the dissemination and organization of scientific knowledge.