Uniform hollow spheres of CoS2 have been successfully synthesized via a facile solvothermal method and electrochemically investigated as anode material for lithium-ion batteries. The key strategy is that sulfur powder is used as the sulfur source, while absolute ethanol (EtOH) serves as the solvent and reducing agent simultaneously. X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) patterns demonstrate the high purity of the product. SEM images display that the hollow spheres are about 2−3 μm in diameter and 300 nm in shell thickness. The mechanism for the formation of the final hollow structure is discussed. Temperature and reaction concentrations are found to be the key factors in controlling the morphologies. Meanwhile, electrochemical measurements reveal that the as-prepared CoS2 delivers high discharge capacity (1210 mAh g−1) and good cycle stability, indicating that it might find possible application as anode material for lithium-ion batteries in the long term.
The
lower energy density and safety issues of liquid sodium-ion
batteries have been unable to satisfy the ever-increasing demands
for large-scale energy storage system. As a low-cost alternative,
solid-state sodium metal batteries (SSMBs) have shown great competitive
advantages and extensive application prospects due to their high energy
density and desirable safety. However, the solid-state electrolytes
(SSEs) often possess low ionic conductivity, and the poor interface
compatibility and inferior stability between SSEs and electrodes can
result in the continuous deterioration of the electrochemical performance.
This review summarizes the recent progresses of sodium-based SSEs,
including the sodium ion transport mechanisms of different types of
SSEs, some emerging materials in different dimensions, and interface
engineering. Furthermore, the critical challenges and new perspectives
are emphasized in detail. This review provides deeper insights to
construct more comprehensive and effective SSEs for next-generation
high-performance SSMBs.
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