Hierarchical assembly and superior sodium storage properties of a sea-sponge structured C/SnS@C nanocomposite

Abstract

A novel sea-sponge structured C/SnS@C nanocomposite exhibits excellent cyclability over 2000 cycles as sodium-ion batteries.

Explicating the Sodium Storage Kinetics and Redox Mechanism of Highly Pseudocapacitive Binary Transition Metal Sulfide via Operando Techniques and Ab Initio Evaluation

“…To further analyze the pseudocapacitive contribution, Equation is utilized which it is evaluated as 72.4–85.3% with increasing scan rates. It is worthwhile to mention that even at the low scan rate of 0.1 mV s −1 , a high capacitance contribution of 72.4% is achieved which is significantly higher than many of the similarly reported transition metal sulfides systems indicating highly reversible and stable capability (Figure c) . The overall CV profiles versus the pseudocapacitance contribution at 1.0 mV s −1 is shown in Figure d, indicating the dominant contribution of the capacitive‐driven mechanism via the area coverage of the capacitive contribution versus total capacity.…”

3D Graphene Networks Encapsulated with Ultrathin SnS Nanosheets@Hollow Mesoporous Carbon Spheres Nanocomposite with Pseudocapacitance‐Enhanced Lithium and Sodium Storage Kinetics

“…SnS@C‐rGO possesses HMCSs and 3D interconnected conductive rGO network, giving the nanocomposite a high conductivity and fast Na + transfer kinetics. Similarly, the electrochemical performance of SnS@C‐rGO is equally compared with most of the SnS‐based anodes for SIBs reported in previous literatures and listed in Table S2 in the Supporting Information . The capacity and cycle stability of SnS@C‐rGO in this work excelled majority of anodes reported in the literature.…”

“…Various methods have been developed to settle the above critical issues, including optimizing the morphology and structure, expanding the interlayer distance and combining them with conductive carbonaceous materials. Among them, incorporating SnS with conductive carbonaceous substrates (such as graphene, nanofibers, and carbon nanotubes) has proven to be an effective strategy to improve electron transfer, prevent the pulverization, and accommodate volume expanding during cycling, thereby maintaining structural integrity of the overall electrode . 2D graphene is considered to be the most appealing substrate because of its fantastic features of superior electrical conductivity, admirable mechanical flexibility, and excellent chemical stability.…”

Hollow Spheres Consisting of SnS Nanosheets Conformally Coated with S‐Doped Carbon for Advanced Lithium‐/Sodium‐Ion Battery Anodes

“…Secondly, tin sulfide electrodes have unsatisfactory rate characteristics because of the low intrinsic conductivity. To improve the electrochemical performance, the tin sulfide hollow structure should be coated with carbon layer or/and integrated with nano‐size carbon such as graphene and 3D carbon . However, fabrication of a carbon layer on the hierarchical tin sulfide hollow structure is quite complicated, and time consuming and the coating may not be uniform.…”

“…To improve the electrochemical performance, the tin sulfide hollow structure should be coated with carbon layer or/and integrated with nano-size carbon such as graphene and 3D carbon. [12,13] However, fabrication of a carbon layer on the hierarchical tin sulfide hollow structure is quite complicated, and time consuming and the coating may not be uniform. Furthermore, tin sulfide/carbon composites fabricated by traditional methods suffer from the large interface resistance and poor mechanical adhesion between tin sulfide and carbon.…”