Flowerlike Tin Diselenide Hexagonal Nanosheets for High-Performance Lithium-Ion Batteries

Abstract

SnSe 2 nanosheet is a common anode for lithium-ion batteries (LIBs), but its severe agglomeration hinders its practical application. Herein, a three-dimensional (3D) SnSe 2 nanoflower (F-SnSe 2) composed of non-stacking vertical upward hexagonal nanosheets was prepared through a colloidal method as an anode material for LIBs. Benefiting from the advantages of fast reaction-diffusion kinetics and buffering unavoidable volume variation during cycling, the F-SnSe 2 electrode displays remarkable specific capacity of 795 mAh g −1 after 100 cycles at 100 mA g −1 and superior rate performance (282 mAh g −1 at 2,000 mA g −1). This work provides an effective way to get non-stacking nanosheets in energy storage field.

Confining Nano-GeS2 in Cross-Linked Porous Carbon Networks for High-Performance and Flexible Li-Ion Battery Anodes

“…Moreover, the rate cycle performance of GeS 2 /C-2 was investigated, and the results under various current densities (0.1–4.0 A g –1 ) are presented in Figure c, GeS 2 /C-2 delivered a reversible capacity of about 585 mA h g –1 when the current density further changed to 0.2 A g –1 , suggesting the good rate cycle performance of GeS 2 /C-2. The performance of GeS 2 /C-2 was also compared with reported chalcogenides in the literatures, − as shown in Figure d. GeS 2 /C-2 showed one of the best performances compared to chalcogenides, such as high reversible capacity of discharge/charge at 0.1 A g –1 or high reversible capacity of rate cycles.…”

Terminal Group‐Oriented Self‐Assembly to Controllably Synthesize a Layer‐by‐Layer SnSe2 and MXene Heterostructure for Ultrastable Lithium Storage

“…The extra capacity probably originated from the interlayer lithium storage for the 2D heterostructured nanomaterials with abundant interlayer gaps. [11,17,18,60] Figure 3d and Figure S6 (Supporting Information) display cycling performance comparisons among the LBL-SnSe 2 @MXene, MXene and pure SnSe 2 at 0.2 C. As displayed in Figure S6a (Supporting Information), pure MXene can only provide a low reversible capacity of 149 mAh g −1 . Thus, the initial high reversible capacity of the LBL-SnSe 2 @MXene is mainly contributed by SnSe 2 .…”

“…I) SnSe 2 , as a semiconductor member, has lower electrical conductivity, which is detrimental to the electrochemical lithium storage process. [17] II) During the lithiation/delithiation process, SnSe 2 generally undergoes a drastic volume change, which results in severe electrode disintegration and poor stability during repeated cycles. [18,19] To overcome the above weaknesses, constructing homogeneous heterostructures between lithium storage materials and conductive substrates is an effective strategy.…”

Fluidized Bed Chemical Vapor Deposition on Hard Carbon Powders to Produce Composite Energy Materials

“…Interestingly, the band gap of the material can be changed by choosing appropriate chalcogens or their combination with tunable band gaps in the 1–2 eV range. On the other hand, weakly coupled layers allow for confined charge, spin, and heat transfer. − In this respect, tin chalcogenides hold a high potential for several applications in electronics, such as optoelectronics, thermoelectrics, and phase change devices, ,,− and in photocatalysis and electrocatalysis. − In particular, they are a high capacity active material for Na-ion battery anodes. − Hence, the deposition of metal dichalcogenides with controlled composition, good substrate/deposit contact, and uniform dispersion on HC powders can be used to exemplify depositions onto carbons to produce functional materials.…”