Li-SF₆ battery has been proposed as a novel energy conversion device for both reducing greenhouse-effect SF₆ and potentially providing large specific energy. However, the real discharge process of SF₆ remains ambiguous with fast cathode passivation and large polarization. Here we report that the Li-SF₆ chemistry is able to deliver an unprecedented capacity of >20000 mA h g_c^-1 with reduced polarization and excellent rate capability by using a low-cost, high-surface-area porous carbon as cathode host. More importantly, by adjusting the SF₆ atmospere, an approximative eight-electron transfer process with predominant products of LiF and Li₂S is realized via two voltage steps, whereas previously only a little Li₂S could be found with one plateau appearing. The eight-electron process leads to a high energy density about 2300 Wh kg^-1 based on the mass of carbon and discharge products, which sheds light on SF₆ as a promising high-energy-density cathode.

已经提出了Li-SF ₆电池作为一种新颖的能量转换装置，用于减少温室效应SF ₆并潜在地提供大的比能量。然而，SF ₆的实际放电过程在快速的阴极钝化和大的极化作用下仍然模棱两可。在这里我们报告说，通过使用低成本，高表面积的多孔碳作为阴极主体，Li-SF ₆化学物质能够提供前所未有的> 20000 mA hg _c ^-1的容量，并具有降低的极化和出色的倍率能力。更重要的是，通过调节SF ₆气氛，利用LiF和Li _2的主要产物进行了近似的八电子转移过程S是通过两个电压阶跃实现的，而以前只能发现少量Li ₂ S并出现一个平稳状态。八电子过程导致约2300瓦kg的高能量密度^-1基于由碳和放电产物的质量，其在SF揭示光₆作为有力的高能量密度的阴极。