Mesoporous NiS₂ Nanospheres Anode with Pseudocapacitance for High‐Rate and Long‐Life Sodium‐Ion Battery

Abstract

It is of great importance to exploit electrode materials for sodium-ion batteries (SIBs) with low cost, long life, and high-rate capability. However, achieving quick charge and high power density is still a major challenge for most SIBs electrodes because of the sluggish sodiation kinetics. Herein, uniform and mesoporous NiS nanospheres are synthesized via a facile one-step polyvinylpyrrolidone assisted method. By controlling the voltage window, the mesoporous NiS nanospheres present excellent electrochemical performance in SIBs. It delivers a high reversible specific capacity of 692 mA h g . The NiS anode also exhibits excellent high-rate capability (253 mA h g at 5 A g ) and long-term cycling performance (319 mA h g capacity remained even after 1000 cycles at 0.5 A g ). A dominant pseudocapacitance contribution is identified and verified by kinetics analysis. In addition, the amorphization and conversion reactions during the electrochemical process of the mesoporous NiS nanospheres is also investigated by in situ X-ray diffraction. The impressive electrochemical performance reveals that the NiS offers great potential toward the development of next generation large scale energy storage.

Designed Formation of Hybrid Nanobox Composed of Carbon Sheathed CoSe2 Anchored on Nitrogen‐Doped Carbon Skeleton as Ultrastable Anode for Sodium‐Ion Batteries

“…Recently, the research on sodium‐ion batteries (SIBs) has been revitalized owing to its much lower cost and comparable energy/power density to LIBs, which has been considered as one of most promising system for grid‐level applications . Unfortunately, the sluggish electrochemical kinetics and larger radius of Na + derived serious volume change of host could result in fast capacity fading and poor rate performance of SIBs . Therefore, it is one of the central task to explore advanced architectures for electrode materials with dramatically enhanced electrochemical performance in order to push forward the development of SIBs.…”

TiO2‐Coated Interlayer‐Expanded MoSe2/Phosphorus‐Doped Carbon Nanospheres for Ultrafast and Ultralong Cycling Sodium Storage

“…[1][2][3][4] Nevertheless, the large ionic radius of an Na + ion (≈1.09 Å), which is 55% larger than that of Li + ion, and its higher molar mass make the sodiation/desodiation kinetics more sluggish, impeding the development and practical application of SIBs. [8][9][10] MoSe 2 , a representative type of layered transition metal dichalcogenide (TMD) material, exhibits high theoretical capacity, large interlayer spacing, and small bandgap, and thus has been proved to be a good candidate anode material for SIBs. [8][9][10] MoSe 2 , a representative type of layered transition metal dichalcogenide (TMD) material, exhibits high theoretical capacity, large interlayer spacing, and small bandgap, and thus has been proved to be a good candidate anode material for SIBs.…”

Nanostructured Conversion‐Type Negative Electrode Materials for Low‐Cost and High‐Performance Sodium‐Ion Batteries

“…A specific capacity of 499.9 mAh g −1 can be retained for the 50th cycle at 100 mA g −1 , corresponding to capacity retention of 73%. Sun et al prepared mesoporous NiS 2 nanospheres by facile hydrothermal strategy. When evaluated as negative electrode material for SIBs, the NiS 2 nanospheres deliver a capacity of 319 mAh g −1 at 0.5 A g −1 for the 1000th cycle and a reversible capacity of 253 mAh g −1 at 5 A g −1 .…”