Rational design and fabrication of frame‐structured doped bismuth vanadate nanoarchitectures as a polysulfide shield to boost the performance of lithium‐sulfur batteries

Abstract

Summary Lithium‐sulfur (Li‐S) battery has been evoked increasing attention due to its creditable energy density and the abundant sulfur in nature. Nevertheless, its commercialization is still hampered in virtue of the poor conductivity of sulfur and grievous polysulfide shuttling. To address these issues, in this work, we report a cost‐efficient and facile tactic to fabricate frame‐structured neodymium‐doped bismuth vanadate (BiVO4) nanoarchitectures, which are reasonably designed as a polysulfide shield to alleviate the shuttling effects. The synthesized nanoarchitectures exhibit typical tetragonal phase with a unique frame structure. The frame structure of BiVO4 impedes polysulfide shuttling, and supplies electronic and ionic transmission routes. Furthermore, the rational doping of neodymium within the BiVO4 nanoarchitectures can improve electric conductivity, as well as efficiently alleviate the loss of sulfur and improve activity for sulfur reduction. Benefitting from the structural feature and doping strategy, the Li‐S battery performance with a neodymium‐doped BiVO4 nanoarchitecture is significantly improved. This strategy is easily adopted for fabricating other nanostructures, providing a feasible way to design cheap and efficient battery materials. This work is further available for synergistically uniting the virtues of the frame nanoarchitectures and doping protocol to develop advanced Li‐S batteries.

Synergistic effect of titanium‐oxide integrated with graphitic nitride hybrid for enhanced electrochemical performance in lithium‐sulfur batteries

“…The D Li+ values according to Equations S3 and S4 are 2.3 × 10 −7 cm 2 s −1 and 6.4 × 10 −9 cm 2 s −1 for TOCN@S and CN@S composite electrodes, which further proved as above results. [58][59][60] Such a facile synthesis strategy provided for environmental-friendly and resourcesaving approach for easy and large-scale preparation of CN-based composites for modification sulfur cathode, which demonstrated more development of high energy density and durable Li-S batteries.…”

Alleviating the polysulfides “shuttling” and improving the sulfur utilization ably by the micropores of MOFs materials

“…Metal‐organic frameworks (MOFs) with the various structure, adjustable pore size, and easy functionalization of pore surfaces are recognized as a suitable modified matrix for Li‐S battery cathode in recent years 25‐30 . The hierarchical porous structure of MOFs can confine polysulfides/sulfur to promote the utilization of sulfur and the crystalline structure of MOFs with metal as center can bond with polysulfides to enhance anchoring and trapping 31‐37 . Despite the accommodation of mesopores/ macropores with larger pore volume, the utilization rate of sulfur in traditional MOFs matrix is usually low for its open‐pore structure and weaker adsorption cause sulfur loss gradually during charge‐discharge process 38,39 .…”