A "Biconcave-Alleviated" Strategy to Construct -Derived Carbon/MoS for Ultrastable Sodium Ion Storage.

Two-dimensional layered materials commonly face hindered electron transfer and poor structure stability, thus limiting their application in high-rate and long-term sodium ion batteries. In the current study, we adopt finite element simulation to guide the rational design of nanostructures. By calculating the von Mises stress distribution of a series of carbon materials, we find that the hollow biconcave structure could effectively alleviate the stress concentration resulting from expansion.

Cubic MnS-FeS Composites Derived from a Prussian Blue Analogue as Anode Materials for Sodium-Ion Batteries with Long-Term Cycle Stability.

Cubic N,S codoped carbon coating MnS-FeS composites (MnS-FeS@NSC) with a hollow structure were prepared and used as anode materials for sodium-ion batteries. MnS-FeS@NSC exhibits excellent cycle performance and high rate capability and delivered a reversible capacity of 501.0 mAh g after 800 cycles at a current density of 0.