ABSTRACT
Li-S batteries (LSBs) have attracted worldwide attention owing to their characteristics of high theoretical energy density and low cost. However, the commercial promotion of LSBs is hindered by the irreversible capacity decay and short cycling life caused by the shuttle effect of lithium-polysulfides (LiPSs). Herein, a hybrid interlayer consisting of MoO3 , conductive Ni foam, and Super P is prepared to prevent the shuttle effect and catalyze the LiPSs conversion. MoO3 with a reversible lithiation/delithiation behavior between Li0.042 MoO3 and Li2 MoO4 within 1.7-2.8 V versus Li/Li+ combines the Li+ insertion and LiPSs immobilization and efficiently improve the LSBs redox kinetics. Benefiting from the reversible Li+ insertion/extraction in lithium molybdate (Lix MoOy ) and the highly conductive Ni foam substrate, the sulfur cathode coupled with such electrochemical activation derived catalytic interlayer exhibits a high initial discharge capacity of 1100.1 mAh g-1 at a current density of 1 C with a low decay rate of 0.09% cycle-1 . Good capacity retention can still be obtained even the areal sulfur loading is increased to 13.28 mg cm-2 .
ABSTRACT
In order to solve the problem of uneven spatial frequency sampling and lack of zero frequency sampling in the segmented planar imaging detector for electro-optical reconnaissance (SPIDER), we propose a "checkerboard" imaging system design using a square grid aperture arrangement, show its aperture matching method, and demonstrate that it can achieve the uniform sampling of all integer multiples of fundamental frequency in the highest frequency range with zero frequency in the direction of two orthogonal arrays. Through computer simulation, it is verified that the imaging effect of the "checkerboard" imaging system is superior to that of the SPIDER imaging system and the traditional single aperture imaging system at the same system diameter.
