Graphene‐Supported Ce–SnS₂ Nanocomposite as Anode Material for Lithium‐Ion Batteries

Abstract

A graphene‐supported Ce–SnS2 (Ce–SnS2/graphene) nanocomposite has been synthesized via a hydrothermal route. Structure, morphology, and electrochemical properties of the composites were studied by means of XRD, SEM, TEM, Raman, XPS, TGA, and electrochemical measurements. The Ce–SnS2 crystal particles with a flower‐like structure were distributed on the graphene sheets (GNS). The particle sizes of each petal are in the range 50–100 nm with clear lattice fringes. The atomic ratio of Sn, S, Ce, C, and O is estimated to be 1:2:0.05:3.11:0.64 and the content of Ce–SnS2 composite is 80 wt.% in the as‐synthesized sample. The Ce–SnS2/graphene composite exhibits high initial discharge capacity (1638.3 mAh/g at 0.5 C), high capacity retention (707 mAh/g at 0.5 C after 50 cycles), and good rate capability due to the synergy effect between Ce–SnS2 nanoparticles and graphene nanosheets. The superior performance is ascribed to the presence of graphene keeping the structure stable.

Ag2Mo3O10 Nanorods Decorated with Ag2S Nanoparticles: Visible‐Light Photocatalytic Activity, Photostability, and Charge Transfer

“…[21] The up-shifto ft hesep eaks (about 0.6 eV)i nA g 2 S-6.2 % indicated the presence of ac hemical interaction between Ag 2 Mo 3 O 10 and Ag 2 S. [22] Twop eaks at 158.9 eV and 163.8 eV in Figure 3c were from the S2p 3/2 and S2p 1/2 in the Ag 2 Sn anoparticles deposited on Ag 2 Mo 3 O 10 . [23] The FTIR spectra of Ag 2 Mo 3 O 10 and Ag 2 S-6.2 %i nF igure 3d are very similar.T he peaks in 500-1000 cm À1 were assigned to the stretching modes of Ag 2 Mo 3 O 10 ,t he peak at around 1625 cm À1 was ascribed to absorbed H 2 Om olecule, and the broad band at 3000-3500 cm À1 wasf rom the water of crystallization of Ag 2 Mo 3 O 10 and surface-absorbed H 2 Om olecule. Nevertheless, the bands in Ag 2 S-6.2 %s pectrum became smaller owing to the composite of Ag 2 So nA g 2 Mo 3 O 10 .N oc haracteristic peaks from thiourea were observed.…”

Significant impact of 2D graphene nanosheets on large volume change tin-based anodes in lithium-ion batteries: A review

“…Following this strategy, GNSs, as an excellent matrix, have been introduced to create composite anodes. GNSs combined with Cedoped SnS 2 nanocomposites [181] show high capacity retention (707 mAh g À1 at 0.5 C after 50 cycles), which demonstrates that the introduction of GNSs greatly increases SnS 2 performance (446 mAh g À1 for CeeSnS 2 after 50 cycles). Thus, a series of tin sulfide/graphene composites were recently reported in the literature [182e189].…”

Preparation of graphene supported porous SnO2/NiO ternary composites as high capacity anode materials for Li-ion batteries

“…Rs is the bulk resistance of the electrolyte, separator and electrode. Rf and CPE1 are the resistance and capacitance of the SEI film; Rct and CPE2 are the charge-transfer resistance and double-layer capacitance; W is the Warburg impedance [21,22]. Obviously, charge-transfer resistance of PSNG (43.86 Ω) is smaller than that of PSN (106.43 Ω) and the semicircle arc of PSNG is smaller than that of PSN after 50th cycles, which indicates a smaller electrochemical reaction resistance because graphene can improve the electronic contact among the active particles.…”