No abstract

Potassium thiocyanate as a cheap additive effectively eliminates the hysteresis effect of perovskite solar cells.

Lithium sulfur batteries (LSB) are considered to be one of the most promising energy storage technologies due to their high energy density, low cost and environmental friendliness. However, there are still many defects such as the shuttle effect of polysulfide, the non-conductivity of sulfur and the large volume change of sulfur cathode leading to cyclic decay and instability. To overcome these challenges, in this study, we synthesized the VS 2 nano-flowers (NFs) through the hydrothermal method, and then took them as the sulfur host. The VS 2 NFs possess unique hierarchical structure and excellent electrical conductivity, which can promote Li + and charge transmission, thus improving the reaction kinetics. Besides, the VS 2 has excellent chemical interaction with polysulfides, which can efficiently suppress the migration of polysulfides and inhibit the shuttle effect. It possessed better cyclic stability compared with the pure sulfur counterparts. Impressively, the lithium sulfur batteries (LSBs) with VS 2 /S (1:5) cathodes whose specific capacity decay rate over 200 cycles at 0.2 C was ∼0.16% per cycle. It also greatly improved the sulfur utilization and the rate capability of LSBs. The above results demonstrate that the VS 2 can enhance the cycling performance and has potential application in LSBs.

No abstract

All‐solid‐state lithium batteries (ASSLBs) employing sulfide solid electrolytes (SEs) promise sustainable energy storage systems with energy‐dense integration and critical intrinsic safety, yet they still require cost‐effective manufacturing and the integration of thin membrane‐based SE separators into large‐format cells to achieve scalable deployment. This review, based on an overview of sulfide SE materials, is expounded on why implementing a thin membrane‐based separator is the priority for mass production of ASSLBs and critical criteria for capturing a high‐quality thin sulfide SE membrane are identified. Moreover, from the aspects of material availability, membrane processing, and cell integration, the major challenges and associated strategies are described to meet these criteria throughout the whole manufacturing chain to provide a realistic assessment of the current status of sulfide SE membranes. Finally, future directions and prospects for scalable and manufacturable sulfide SE membranes for ASSLBs are presented.