SnS₂/Sb₂S₃ Heterostructures Anchored on Reduced Graphene Oxide Nanosheets with Superior Rate Capability for Sodium‐Ion Batteries

Abstract

Tin disulfide, as a promising high-capacity anode material for sodium-ion batteries, exhibits high theoretical capacity but poor practical electrochemical properties due to its low electrical conductivity. Constructing heterostructures has been considered to be an effective approach to enhance charge transfer and ion-diffusion kinetics. In this work, composites of SnS /Sb S heterostructures with reduced graphene oxide nanosheets were synthesized by a facile one-pot hydrothermal method. When applied as anode material in sodium-ion batteries, the composite showed a high reversible capacity of 642 mA h g at a current density of 0.2 A g and good cyclic stability without capacity loss in 100 cycles. In particular, SnS /Sb S heterostructures exhibited outstanding rate performance with capacities of 593 and 567 mA h g at high current densities of 2 and 4 A g , respectively, which could be ascribed to the dramatically improved Na diffusion kinetics and electrical conductivity.

Interfacial Bonding of Metal‐Sulfides with Double Carbon for Improving Reversibility of Advanced Alkali‐Ion Batteries

“…[ 20 ] In Figure 3e,f, the distance of lattice spacing was calculated about 0.36 nm, indexed to the (130) planes of Sb 2 S 3 (JCPDs: 73‐0393). [ 21 ] And, it is detected that the carbon layer is compared of amorphous regions, which could show the better buffering effect compared to the graphitized architecture. Based on the analysis above, the double carbon matrix was observed, perhaps facilitating the improvement of ion‐diffusion and the protection of active materials.…”

Anchoring SnS2 on TiC/C Backbone to Promote Sodium Ion Storage by Phosphate Ion Doping

“…[20,21] Nevertheless, pure SnS 2 anode is subjected to fast capacity fading and easy pulverization due to low intrinsic conductivity and large volume expansion in the sodium ion insertion/extraction process. To date, nanostructure design plus binder-free composite with carbonaceous backbone have been demonstrated to be able to effectively address the above issues of SnS 2, [22,23] and it is generally accepted that the rational integration between nanostructured SnS 2 and carbonaceous material could achieve excellent electrochemical property owing to the synergetic effect of both shortened ion/electron path, improved electrical conductivity, and alleviated volume strain. [24][25][26] In addition, binder-free design of nanostructured SnS 2 arrays directly grown on 3D conductive backbones has been reported to avoid the use of inactive substance and obtain higher energy density for the anode.…”

Engineering Ultrathin MoS2 Nanosheets Anchored on N‐Doped Carbon Microspheres with Pseudocapacitive Properties for High‐Performance Lithium‐Ion Capacitors

“…The ionic diffusion coefficient ( D Li+ ) as a function of voltage is calculated by following Equation where the V M , m B , M B , S , and L represent the molar volume, active materials weight molar mass, the contact surface area, and the average thickness of electrode, respectively. In addition, Figure c,d shows a good linear relationship between V and τ 1/2 , so that the Equation can be further simplified to the following Equation where the Δ E s and Δ E τ represent the IR drop and the potential difference in the time range of the t 0 to t 0+ τ during the galvanostatic discharge process, respectively. As shown in Figure e, the D Li + of bare MoS 2 and MoS 2 /N‐NPCM electrode have same overall trends, indicating their similar ion diffusion behavior.…”