Rational Design of Hierarchical SnO₂/1T-MoS₂ Nanoarray Electrode for Ultralong-Life Li–S Batteries

Abstract

The serious shuttle effect of soluble polysulfides inevitably leads to low sulfur utilization and faster capacity decay, thus preventing the development of Li–S batteries. Array electrodes have attracted much attention owing to their binder-free and freestanding features. However, the insufficient surface area, lack of active sites with polysulfides, and poor conductive nature of the array electrode could not satisfy the need for high-rate and long-life Li–S batteries, especially for the high sulfur loading of Li–S batteries. Thus, in this work, we constructed the hierarchical C@SnO2/1T-MoS2 (C@SnO2@TMS) array electrode as the sulfur host. The hierarchical C@SnO2@TMS demonstrated strong adsorption with polysulfides, which could effectively facilitate polysulfide redox kinetics. With the C@SnO2@TMS/S as the electrode, the batteries achieved superb C-rate properties, high specific capacity, and ultralong lifespan. Even undergoing 4000 cycles at 5 C, the battery could retain a high specific capacity of 448 mAh g–1 with the capacity decay as low as 0.009% per cycle.

Two‐Dimensional MoS2 for Li−S Batteries: Structural Design and Electronic Modulation

“…Similarly, SnO 2 /1T-MoS 2 nanoarrays also show better rate properties, higher specific capacity,a nd longer lifespan than those of 2H MoS 2 . [88] Even after 4000 cycles at 5C,t he battery still could retain a high specific capacity of 448 mA hg À1 with ac apacity decay as low as 0.009 %p er cycle ( Figure 12 c). The electronic modulation of MoS 2 to manipulate the LiÀSc hemistry could provide new insights and opportunities toward developing advanced LiÀSb atteries.…”

Two‐Dimensional Material‐Functionalized Separators for High‐Energy‐Density Metal–Sulfur and Metal‐Based Batteries

“…Micrometer thick V 2 O 5 was also applied as the anion barrier layer on the separator to reduce the shuttle effect of PS . Hybrid metal oxide and metal sulfide was also attempted by Zhang and co‐workers with the hierarchical SnO 2 /1T‐MoS 2 nanoarray . The sufficient surface area, active sites, and the strong binding energy of this synergistic interlayer contributed enhanced LSBs performance.…”

“…[43] Hybrid metal oxide and metal sulfide was also attempted by Zhang and co-workers with the hierarchical SnO 2 /1T-MoS 2 nanoarray. [44] The sufficient surfacea rea, active 2D metal sulfides, especially MoS 2 ,w ere also widely applied in the interlayer.I nitially,ahigh ion conductive MoS 2 /PP was prepared as the barrierl ayer in LSB. [45] Owing to the remarkable flexibility,t he 2D MoS 2 could be easily deposited on the separator.T he barrier layer depressed the PS shuttle effect and contributedt ot he improved coulombic efficiency and cycling performance with ac apacity of 401 mAh g À1 after 600 cycles.…”

“…[60] Commercial separators have utilized the addition of ceramicn anoparticles including2 Dm etal oxides/sulfides to reinforce the safety of non-aqueous batteries. [41] Benefiting from the high thermal resistance and en- [44] c) Sb 2 S 3 ; [55] d) MoS 2 . [52] e) Li vacancyd iffusion process and f) migration energyofL i/Li + vacancy on monolayer MoS 2 .…”

SnO2 as Advanced Anode of Alkali‐Ion Batteries: Inhibiting Sn Coarsening by Crafting Robust Physical Barriers, Void Boundaries, and Heterophase Interfaces for Superior Electrochemical Reaction Reversibility

“…at high temperatures, electron‐beam evaporator strategy, and chemical vapor deposition (CVD) process . The capability for simple preparation and the unique physical/chemical properties of SnO 2 ‐based materials have led them to be widely adopted in various other kinds of batteries including lithium–sulfur, lithium–air, zinc–air, zinc/nickel, and all‐vanadium redox flow batteries by serving as substrates or electrocatalysts . Thus, it is worthwhile to systematically summarize the synthesis methods and performance enhancement strategies of SnO 2 ‐based materials to promote their applications in batteries and other various fields.…”