Amorphous Al₂O₃ with N-Doped Porous Carbon as Efficient Polysulfide Barrier in Li–S Batteries

Abstract

Inhibiting the shuttle effect of polysulfides is one key factor to develop a practically applicable Li−S battery. To overcome the shuttle effect, we developed here an ultrastable Li−S battery with amorphous Al 2 O 3 nanohybrid separator for the first time. Through molecular design of the ligands, the material of the separator from carbonized MOF−Al at elevated temperature is composed of amorphous Al 2 O 3 and N-doped porous carbon, which shows higher electrical conductivity, faster lithium diffusion and charge transfer capability, and stronger interaction with lithium polysulfides through the synergistic effect (MOF, metal−organic framework). The fabricated Li−S battery proposed here corresponds to the lowest capacity decay (only 0.054% of capacity decay in each cycle) as far as we know, which may open up new avenues for developing the next-generation lithium-ion battery.

Polyaniline Encapsulated Amorphous V2O5 Nanowire‐Modified Multi‐Functional Separators for Lithium–Sulfur Batteries

“…[ 29,30 ] The long‐range disordered structure will introduce structural defects which in turn provide active sites for the adsorption of LiPSs. [ 31,32 ] A large amount of defects within VOH further strengthen the catalytic activity towards LiPSs conversion. Moreover, recent works have demonstrated that the open channels in disordered materials may reduce the barrier for ionic diffusion.…”

Sustainable Synthesis of N‐Doped Hollow Porous Carbon Spheres via a Spray‐Drying Method for Lithium‐Sulfur Storage with Ultralong Cycle Life

“…Considerable efforts have been explored and demonstrated to address these challenges. During the past decades, specific carbon structures were designed and manufactured as a host of S for polysulphides’ trapping, including hollow porous carbon spheres (HPCS), [7,8] graphene/graphene oxide, [9,10] carbon nanotubes/nanofibers, [11,12] porous carbon, [13,14] and so on. These carbon materials have high electrical conductivity and increased surface area, which are more favorable for relatively high S‐loading and volume expansion restriction due to the physical adsorption of S and mitigate the shuttle effect of polysulfides physically [15–18] .…”

N‐Doped graphene embellished with Co 9 S 8 enable advanced sulfur cathode for high‐performance lithium‐sulfur batteries

“…Recently, heteroatom‐doped carbon was developed as a sulfur‐supporting host material and exhibited a chemical interaction between heteroatom and LiPS in the process . However, in order to maintain the outstanding conductivity, the doping amount was kept low (less than 10%), thus limiting the amount of LiPS adsorption.…”

“…15,16 Recently, heteroatom-doped carbon was developed as a sulfur-supporting host material and exhibited a chemical interaction between heteroatom and LiPS in the process. [17][18][19][20][21][22][23] However, in order to maintain the outstanding conductivity, the doping amount was kept low (less than 10%), thus limiting the amount of LiPS adsorption. Simultaneously, it has been discovered that various transition metal sulfides with high polarities exhibited forceful chemisorption and excellent electrocatalysis, which availably alleviates the shuttle effect for Li-S cells.…”