Encapsulating Metal-Organic-Framework Derived Nanocages into a Microcapsule for Shuttle Effect-Suppressive Lithium-Sulfur Batteries

Abstract

Long-term stable secondary batteries are highly required. Here, we report a unique microcapsule encapsulated with metal organic foams (MOFs)-derived Co3O4 nanocages for a Li-S battery, which displays good lithium-storage properties. ZIF-67 dodecahedra are prepared at room temperature then converted to porous Co3O4 nanocages, which are infilled into microcapsules through a microfluidic technique. After loading sulfur, the Co3O4/S-infilled microcapsules are obtained, which display a specific capacity of 935 mAh g−1 after 200 cycles at 0.5C in Li-S batteries. A Coulombic efficiency of about 100% is achieved. The constructed Li-S battery possesses a high rate-performance during three rounds of cycling. Moreover, stable performance is verified under both high and low temperatures of 50 °C and −10 °C. Density functional theory calculations show that the Co3O4 dodecahedra display large binding energies with polysulfides, which are able to suppress shuttle effect of polysulfides and enable a stable electrochemical performance.

Toward Site-Specific Interactions of nH2 (n = 1–4) with Ga12As12 Nanostructured for Hydrogen Storage Applications

“…The efficacy of Ga 12 As 12 for adsorbed hydrogen molecules is intrinsically studied by considering the FMO, which is fundamentally constituted by the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO). 53 The HOMO−LUMO orbital describes the electronic structure and reveals the flexibility of the electron transition from the valence band to the conduction band. 54 This also includes the tendency to donate and accept electrons, with the HOMO orbital having a higher tendency to donate and the LUMO having a higher tendency to accept electrons.…”

Advances in Microfluidic Technologies for Energy Storage and Release Systems

“…At the outlet, the inner phase will be wrapped by the outer phase which formed the microcapsules continuously under the shear action of the driving fluids. [ 113 ] The same concept of coaxial droplet microfluidics has been applied to fabricate metal–organic framework‐derived nanocage microcapsules [ 114 ] and polysulfide‐confined all‐in‐one porous microcapsules ( Figure a) [ 115 ] for lithium–sulfur battery cathodes, with the latter achieving a high capacity of 1025 mAh g −1 and stable cycling life of 700 cycles. [ 115 ] Moving to sodium‐ion batteries, Zheng et al proposed a microfluidic reactor method of fabricating sodium vanadium fluorophosphate (Na 3 V 2 O 2 (PO 4 ) 2 F) for sodium‐ion battery cathodes (Figure 7b).…”

Influence of Sulfur Loading on Lithium‐Sulfur Battery Performance for Different Cathode Carbon Types

“…[34] Liu et al reported that microcapsules encapsulated with metal-organic frameworks (MOFs)-derived Co 3 O 4 nanocages provided high coulombic efficiency and rate performance in the LiÀ S batteries. [35] While many studies have reported the effect of carbon type on the electrochemical performance of LiÀ S batteries, there is an astonishingly limited understanding of the effect of carbon properties on the battery's cell-and system-level performance. Herein, we investigated the impact of S loading and carbon type on the electrochemical, cell-and system-level performance of the LiÀ S battery by employing experimental and modeling methods together.…”

“…Liu et al. reported that microcapsules encapsulated with metal‐organic frameworks (MOFs)‐derived Co 3 O 4 nanocages provided high coulombic efficiency and rate performance in the Li−S batteries [35] …”