Heterostructured SnS/TiO₂@C hollow nanospheres for superior lithium and sodium storage

Abstract

Hollow SnS/TiO2@C nanospheres with high-performance originating from the built-in electric field introduced by SnS/TiO2 heterostructures for fast ion diffusion.

Bimetal‐organic Framework‐derived Co9S8/ZnS@NC Heterostructures for Superior Lithium‐ion Storage

“…So far, many strategies including downsizing the particle size to fabricate hierarchical nanostructures, constructing composites with conductive carbon matrix, and integration with heterogeneous hybrids to shorten electronic and ionic transport paths, alleviate the internal strain, improve the electrical conductivity, and accommodate the volume changes during cycling, have been devoted to promote the lithium storage performance of metal sulfides. Among these effective approaches, construction of heterostructures consisted of different components with bandgaps difference, is an effective way to promote the electrochemical performance, which could generate a strong built‐in electric field ( E ‐field), promote interface charge transport of ions and electrons, thus improving the reaction kinetics .…”

“…designed MnS/Co 1‐x S heterostructures embedded in porous carbon@reduced graphene oxide to enhance the LIBs . Relatively, a stronger built‐in E ‐field would be generated assuming the heterostructure consisting of narrow bandgap and wide bandgap components, which could accelerate charge carrier transport and improve ion diffusion kinetics, thus leading superior cycling and rate performance . However, the in‐depth understanding the promotion effect at the atomic level within the interface area remains unclear.…”

Toward Understanding the Enhanced Pseudocapacitive Storage in 3D SnS/MXene Architectures Enabled by Engineered Surface Reactions

“…Upon full desodiation to 3.0 V, the peaks corresponding to Sn have completely disappeared, indicating that Sn is converted into very small SnS NPs because only one weak peak for SnS is detectable. [40,47] In addition, the (0 02)p eak of Ti 3 C 2 T x gradually shifts from 4.68 to 4.38 upon discharging to 0.01 V, and reversibly recovers to 4.68 when charging to 3.0 V. This suggestsN a + reversible intercalation into the interlayer spacing, based on the (de)intercalation mechanism of Ti 3 C 2 T x .S uch elasticc haracteristics of the Ti 3 C 2 T x matrix in SnS/Ti 3 C 2 T x -O can efficiently accommodate the strain induced by the remarkable volumec hanges of SnS during ac ombination of conversion and alloying reactions. [48] As ar esult of the CV and ex situ XRD analyses, the electrochemical reactionm echanismo ft he SnS/ Ti 3 C 2 T x -O can be described as follows [Eq.…”

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

“…In particular SnS with the layered orthorhombic structure has a high theoretical capacity and provide plenty of channels for Li/Na ion insertion/deinsertion . Unfortunately, there are problems including the large volume change (260 % in LIBs and 420 % in SIBs) during insertion/deinsertion, low electrical conductivity, and structure re‐organization, which lead to poor cycling stability, inferior rate capability, serious agglomeration, and low materials utilization …”

“…[2] Unfortunately, there are problems including the large volume change (260 % in LIBs and 420 % in SIBs) during insertion/deinsertion, low electrical conductivity, and structure re-organization, which lead to poor cycling stability, inferior rate capability, serious agglomeration, and low materials utilization. [3][4][5][6][7] There has been much research on SnS, for instance, designing nanostructures with the optimal morphology and structure and combining with stable and conductive carbon-based materials. The hierarchical hollow structure with nano-units such as nanoparticles and nanosheets show improved utilization and enhanced Li/Na storage characteristics because the interior space can accommodate the volume expansion and increase the surface area.…”