Li-S batteries with a high theoretical capacity are considered as the most promising candidate to satisfy the increasing demand for batteries with a high areal capacity. However, the low sulfur loading (<2 mg cm-2) and poor flexibility of current Li-S batteries limit their application in establishing foldable Li-S batteries with a high areal capacity. To solve this problem, we employ here a free-standing flexible tandem sulfur cathode with a remarkably high sulfur loading to demonstrate foldable, high-areal-capacity Li-S batteries. The design of the tandem cathode readily increases the sulfur loading and effectively retards the migration of polysulfides. Therefore, the Li-S cell employing the tandem cathode exhibits a high initial areal capacity of 12.3 mA h cm-2 with stable cycling stability even with a high sulfur loading of up to 16 mg cm-2. These tandem cathodes are promising for foldable Li-S cells with a high areal capacity and energy density.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Process Chemistry and Technology
- Electrical and Electronic Engineering