Two‐Dimensional SnSe₂/CNTs Hybrid Nanostructures as Anode Materials for High‐Performance Lithium‐Ion Batteries

Abstract

Tind iselenide (SnSe 2 ), as an anodem aterial,h as outstandingp otential for use in advanced lithium-ion batteries. However,l ike other tin-based anodes, SnSe 2 suffers from poor cycle life and low rate capabilityd ue to large volume expansion during the repeated Li + insertion/de-insertion process. This work reports an effectivea nd easy strategy to combine SnSe 2 and carbon nanotubes (CNTs) to form a SnSe 2 /CNTsh ybrid nanostructure. The synthesized SnSe 2 has ar egularh exagonal shape with at ypical 2D nanostructure and the carbon nanotubes combine well with the SnSe 2 nanosheets. The hybrid nanostructure can significantly reduce the serious damage to electrodes that occurs during electrochemical cycling processes. Remarkably,t he SnSe 2 / CNTse lectrodee xhibits ah igh reversible specific capacity of 457.6 mA hg À1 at 0.1 Ca nd 210.3 mA hg À1 after 100 cycles. At ac ycling rate of 0.5 C, the SnSe 2 /CNTse lectrode can still achieve ah igh value of 176.5 mA hg À1 ,w hereas av alue of 45.8 mA hg À1 is achieved for the pure SnSe 2 electrode. The enhanced electrochemical performance of the SnSe 2 /CNTs electrode demonstrates its great potential for use in lithiumion batteries.T hus, this work reports af acile approacht o the synthesis of SnSe 2 /CNTsa sap romising anode material for lithium-ionb atteries.Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

A Review on the Current Progress and Challenges of 2D Layered Transition Metal Dichalcogenides as Li/Na‐ion Battery Anodes

“…Furthermore, after 100 cycles at 0.1 C, the capacity retention rates were 11.2 %, 14.9 %, 17.1 %, 23.4 % and 12.0 % for pure SnSe 2 , SnSe 2 /0.1Cu, SnSe 2 /0.2Cu, SnSe 2 /0.3Cu and SnSe 2 /0.5Cu electrode, respectively. The same hydrothermal method was used by Hongwen Chen and his co‐workers to combine SnSe 2 and carbon nanotubes into a SnSe 2 /CNT hybrid nanostructure [115a] . A cylindrical thread of carbon nanotubes protected it from degradation due to the long charge‐discharge cycles; additionally, fast ion transport was observed through the large interlayer spacing during the intercalation and de‐intercalation of the metal ion.…”

Hybrid ZnSe‐SnSe2 Nanoparticles Embedded in N‐doped Carbon Nanocube Heterostructures with Enhanced and Ultra‐stable Lithium‐Storage Performance

“…The fitted high-resolution XPS spectrum in Figure 5b present peaks located at 486.3 and 494.8 eV matches to Sn 3d 5/2 and Sn 3d 3/2 , respectively, exhibit partial occurrence of Sn 2 + and Sn 4 + oxidation states in ZSS�NCNs. [27,36,45] Two main peaks fitted at 53.3 and 54.3 eV belongs to Se 3d 5/2 and Se 3d 3/2 (Figure 5c). [20,27] The detail peaks of Zn 2p situated at 1022.3 and 1045.4 eV in Figure 5d related to Zn 2p 3/2 and Zn 2p 1/2 confirm the Zn 2 + state in ZSS�NCNs.…”

“…The pure diffraction peak in Figure S2 demonstrate well 4b). [21,27,41,42] Then the carbon content was calculated to 5.76 % in ZSS�NCNs. In addition, the structure of the formed carbon after carbonized process was confirmed by Raman spectra.…”

“…[23][24][25][26] However, transition metal selenides always suffer from bulky particle agglomeration and drastic volume expansion arise from the alloy or conversion reaction with the result of morphology destruction, creak and furtherly cause rapid capacity loss and bad cycle life. [24,27,28] To address these issues, researchers have taken efforts like nanocrystallization, nanostructure control and hybrid materials with insertion/extraction-types (C, TiO 2 ) to enhance electric conductive, buffer the volume change and present superior electrochemical performances. [29][30][31] Shi and coauthors prepared highly ordered mesoporous crystalline MoSe 2 via a nanocasting strategy possess a reversible stable capacity of 630 mA h g À 1 after 35 cycles.…”

Towards high-performance anodes: Design and construction of cobalt-based sulfide materials for sodium-ion batteries

“…In addition, the frequently used polyvinylidene fluoride (PVDF) polymer binder in the preparation of the electrodes can increase the resistance and obstruct active sites, and thus lead to capacity fading, especially at high current density. To resolve these issues, the most common strategy is encapsulation of the cobaltbased sulfide in highly electrically conductive carbon materials, such as porous carbon [85][86][87], carbon nanofibers [88][89][90], carbon nanotubes (CNTs) [91][92][93][94][95] and graphene [96][97][98]. The formed carbon-containing composites could shorten the Na + diffusion length, prevent the aggregation of nanocrystals, facilitate the surface pseudocapacitive process, and mitigate the volume variation in the Na + intercalation/deintercalation procedure.…”