Sandwich‐like MoS₂@SnO₂@C with High Capacity and Stability for Sodium/Potassium Ion Batteries

Abstract

Sandwich-like MoS @SnO @C nanosheets are prepared by facile hydrothermal reactions. SnO nanosheets can attach to exfoliated MoS nanosheets to prevent restacking of adjacent MoS nanosheets, and carbon transformed from polyvinylpyrrolidone is coated on MoS @SnO , forming a sandwich structure to maintain cycling stability. As an anode for sodium-ion batteries, the electrode greatly deliverers a high initial discharge specific capacity of 530 mA h g and maintains at 396 mA h g after 150 cycles at 0.1 A g . Even at a large current density of 1 A g , it can hold 230 mA h g after 450 cycles. Besides, as an anode for K storage, the electrode also shows a discharge capacity of 312 mA h g after 25 cycles at 0.05 A g . This work may provide a new strategy to prepare other composites which can be applied to new kind of rechargeable batteries.

Few‐Layered Tin Sulfide Nanosheets Supported on Reduced Graphene Oxide as a High‐Performance Anode for Potassium‐Ion Batteries

“…It is known that the low‐voltage (<0.50 V) capacity contribution of anode is more essential to the energy density of the full cells . Comparing with the previously reported PIB anodes in ester‐based electrolytes such as carbon‐based materials, conversion‐based materials, and alloy‐based materials, the as‐prepared SnS 2 @rGO‐2 electrode delivers the highest reversible capacity in the low voltage range of 0.01–0.50 V (Figure c). Therefore, this encouraging result suggests that SnS 2 @rGO‐2 possesses great potential as high‐energy‐density anode material for PIBs.…”

“…However, their low specific capacity (around 200 mAh g −1 ) and high average operating voltage (>0.5 V) limit the energy density of PIBs . Very recently, some noncarbonaceous anodes based on conversion/alloying mechanisms have been explored for K storage, exhibiting increased specific capacity compared with the carbonaceous materials . Among them, Sn‐based compounds (e.g., Sn 4 P 3 , SnS 2 ) combining the conversion and alloying reactions are expected to be promising anode candidates due to their high theoretical specific capacities .…”

Strain Redistribution in Metal‐Sulfide‐Composite Anode for Enhancing Volumetric Lithium Storage

“…For MoS 2 @C composite, all the diffraction peaks can be matched with hexagonal MoS 2 phase (JCPDS No. 17‐1492), and the diffraction peaks of carbon layer cannot be observed due to the low content of amorphous carbon ,,. After second hydrothermal treatment, the main diffraction peaks located at 13.4°, 33.0°, 39.7°and 58.5° can be indexed to the (002), (100), (103) and (110) planes of hexagonal MoS 2 phase (JCPDS No.…”

Insights into the Photoassisted Electrocatalytic Reduction of CO2 over a Two‐dimensional MoS2 Nanostructure Loaded on SnO2 Nanoparticles

“…illustrated how doped MoS 2 breaks in transition‐metal influence the CO 2 electrochemical reduction by theoretical calculation. Chen et al. investigated the electrocatalytic activity of sandwich‐like MoS 2 @SnO 2 @C as an anode for sodium‐ion batteries, the results indicated that the capacitance is beyond imagination reached up to 530 mA h g −1 .…”