In-situ coupling SnS with nitrogen-doped porous carbon for boosting Li-storage in lithium-ion battery and capacitor

A Novel Hierarchical Structure of SnCu2Se4/d-Ti3C2Tx/NPC for a Lithium/Sodium Ion Battery and Hybrid Capacitor with Long-Term Cycling Stabilities

To alleviate kinetics imbalance and capacity insufficiency simultaneously, a novel hierarchical structure (SnCu₂Se₄/d-Ti₃C₂T_x/NPC) composed of delaminated Ti₃C₂T_x, SnCu₂Se₄ nanoparticles, and N-doped porous carbon layers is designed as a battery-type anode for lithium/sodium ion hybrid capacitor (LIC/SIC). The combination of SnCu₂Se₄ nanoparticles with high specific capacity, d-Ti₃C₂T_x with accelerated ion diffusion path, and NPC with enhanced electronic conductivity makes the SnCu₂Se₄/d-Ti₃C₂T_x/NPC composite possess excellent cycling stabilities in half-cell lithium-ion and sodium-ion batteries (LIB and SIB), with capacities of 114 mAh g^-1 after 6000 cycles at 10 A g^-1 for LIB and 296 mAh g^-1 after 900 cycles at 1.0 A g^-1 for SIB. The rate performance is also outstanding, with recovered capacity of 738 mAh g^-1 at 0.1 A g^-1 after cycles at current densities up to 50 A g^-1 for LIB. Subsequently, LIC and SIC based on the SnCu₂Se₄/d-Ti₃C₂T_x/NPC anode and activated carbon cathode exhibit high energy densities of 147.9 and 158.6 Wh kg^-1 at a power density of 100 W kg^-1, respectively. They also possess distinctive long lifespans with capacity retentions of 78 and 81% after 10,000 cycles at 1.0 A g^-1, respectively, demonstrating the feasibility of SnCu₂Se₄/d-Ti₃C₂T_x/NPC toward energy devices requiring high energy density, power density, and long-term stability.

Exploring 2D Energy Storage Materials: Advances in Structure, Synthesis, Optimization Strategies, and Applications for Monovalent and Multivalent Metal-Ion Hybrid Capacitors

The design and development of advanced energy storage devices with good energy/power densities and remarkable cycle life has long been a research hotspot. Metal-ion hybrid capacitors (MHCs) are considered as emerging and highly prospective candidates deriving from the integrated merits of metal-ion batteries with high energy density and supercapacitors with excellent power output and cycling stability. The realization of high-performance MHCs needs to conquer the inevitable imbalance in reaction kinetics between anode and cathode with different energy storage mechanisms. Featured by large specific surface area, short ion diffusion distance, ameliorated in-plane charge transport kinetics, and tunable surface and/or interlayer structures, 2D nanomaterials provide a promising platform for manufacturing battery-type electrodes with improved rate capability and capacitor-type electrodes with high capacity. In this article, the fundamental science of 2D nanomaterials and MHCs is first presented in detail, and then the performance optimization strategies from electrodes and electrolytes of MHCs are summarized. Next, the most recent progress in the application of 2D nanomaterials in monovalent and multivalent MHCs is dealt with. Furthermore, the energy storage mechanism of 2D electrode materials is deeply explored by advanced characterization techniques. Finally, the opportunities and challenges of 2D nanomaterials-based MHCs are prospected.

An interlinked computational–experimental investigation into SnS nanoflakes for field emission applications

Layered binary semiconductor materials have attracted significant interest as field emitters due to their low work function, mechanical stability, and high thermal and electrical conductivity.