Preparation of CoSnO₃/CNTs/S and its Electrochemical Performance as Cathode Material for Lithium‐Sulfur Batteries

Abstract

To address low electrical conductivity of sulfur and “poly‐sulfide shuttle” for constructing sulfur hosts with excellent cyclic stability, CoSnO3/CNTs composites are successfully synthesized by combining CoSnO3 cubes and carbon nanotubes (CNTs) via coprecipitation and annealing process. CoSnO3 cubes are bound by continuous carbon nanotube networks, with high specific surface area and vast mesoporous. CoSnO3 with multiple polar active sites has a strong chemical adsorption effect on lithium polysulfide, suppressing the shuttle effect. The carbon nanotubes have continuous conductive networks, which can provide physical confinement with polysulfides and good electrical conductivity. Through the effective combination of advantages of CoSnO3 and carbon nanotubes, CoSnO3/CNTs/S exhibits excellent sulfur storage performance. The maximum discharge capacity of CoSnO3/CNTs/S is 453.3 mAh g−1 at a current density of 0.2 C. After 500 cycles, the discharge specific capacity is still 377.7 mAh g−1. The simple synthesis of CoSnO3/CNTs/S with long cycle life provides a new direction for the future LSBs cathode material research.

Zephyranthes-like Co2NiSe4 arrays grown on 3D porous carbon frame-work as electrodes for advanced supercapacitors and sodium-ion batteries

“…The peaks (Fig. 4(f)) at 398.9, 399.6, and 400.7 V are related to pyridinic N, pyrrolic N, and graphitic N, respectively [33]. N doping in Z-Co2NiSe4/BWC will enhance its electron donating ability and benefit the rapid diffusion of large Na + .…”

CoSnO3 Nanocubes Wrapped by Carbon Nanofibers for Improving Lithium‐Sulfur Battery Performances

“…Figure 2b shows the morphology of CoSnO 3 nanocubes with a mean size of 200 ∼ 300 nm, which is consistent with our previous work. [29] The shape of CoSn(OH) 6 encased in PAN is shown in Figure 2c, forming a fiber structure. The CoSn(OH) 6 nanocubes are wrapped and scattered in PAN fibers.…”

High-performance lithium-sulfur battery based on porous N-rich g-C3N4 nanotubes via a self-template method

“…9(b) shows the EIS curves of fresh and spent (i.e., after 100 cycles) PCNNTs/S at the open-circuit potential. The impedance of a battery includes electrolyte resistance (R e ), charge transfer resistance (R ct ), and interface resistance (R i ) [36][37][38][39][40]. The impedance spectra of the PCNNTs/S are composed of two semicircles and a slope line; the first semicircle represents R ct , the second semicircle represents R i , and the slope line represents the Warburg-type resistance.…”