Tetrabutylammonium‐Intercalated 1T‐MoS₂ Nanosheets with Expanded Interlayer Spacing Vertically Coupled on 2D Delaminated MXene for High‐Performance Lithium‐Ion Capacitors

Abstract

2D 1T phase MoS2 (1T‐MoS2) nanosheet with metallic conductivity and expanded interlayer spacing is considered as a highly potential lithium storage electrode material but remains thermodynamic instability in aqueous media, seriously hindering the electrochemical performance. Herein, a versatile strategy is proposed for the preparation of thermodynamically stable 1T‐MoS2/MXene heterostructures with the aid of delaminated Ti3C2Tx MXene (d‐Ti3C2Tx) dispersion containing tetrabutylammonium hydroxide. The 2D d‐Ti3C2Tx provides more uniform nucleation sites for MoS2, and the TBA+ ions can intercalate into MoS2 to induce the phase conversion from semiconducting 2H to 1T. Moreover, the electrochemical advantages of 1T‐MoS2 and d‐Ti3C2Tx can be united by the construction of a well‐organized heterostructure. Outstanding rate performance is realized because of extra‐large interlayer space of 1T MoS2 with TBA+ intercalation and decreased energy barrier for fast Li+ diffusion. Subsequently, a lithium‐ion capacitor (LIC) is assembled based on 1T‐MoS2/d‐Ti3C2Tx as anode and hierarchically porous graphene nanocomposite with micro/mesoporous structure as a cathode. The LIC exhibits a large energy density up to 188 Wh kg−1, an ultra‐high power density of 13 kW kg−1, together with remarkable capacity retention of 83% after 5000 cycles. This study demonstrates the great promise of 1T‐MoS2/d‐Ti3C2Tx heterostructures as anode for high‐performance LICs.

Fast Charging Anode Materials for Lithium‐Ion Batteries: Current Status and Perspectives

“…This strategy has been extensively employed to boost the electrochemical performance of MoS 2 . [251,252] In addition, some other transition metal dichalcogenides with the similar layered structure to MoS 2 , such as VS 2 , [253,254] WS 2 [255] and CoS 2 , [256] have also been explored as fast charging anodes for Li-ion batteries. Recently, Li et al [253] prepared VS 2 NS@CNTs composites with core/branch structure by a chemical vapor deposition process, and revealed the mechanism of lithiation/delithiation by in situ scanning electron microscopy (SEM) and transmission electron microscopy (TEM).…”

Homologous Nitrogen‐Doped Hierarchical Carbon Architectures Enabling Compatible Anode and Cathode for Potassium‐Ion Hybrid Capacitors

“…Alkali metal-ion (Li + , Na + , and K + ) hybrid capacitor, which delicately combines a battery-type anode and a capacitor-type cathode, has been widely explored as a promising route to bridge the gap between batteries and supercapacitors. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Among them, potassium-ion hybrid capacitors (PIHCs) have emerged as a potential candidate to replace prevailing lithium-ion hybrid capacitors because of comparable standard electrode potential and ubiquitous potassium resources. [16][17][18] Nevertheless, the crucial factor to gain rapid kinetics of K + at the anode interface.…”

Sacrificial Template Synthesis of Two-Dimensional Few-Layer MoSe2 Coupled with Nitrogen-Doped Carbon Sheets for High-Performance Sodium Ion Hybrid Capacitors

“…12−14 Meanwhile, although the conversion-type and alloy-type materials have high theoretical capacities, they suffer from large volume expansion and poor cyclic performance. 15,16 Consequently, the rational design of a promising anode material with high reversible capacity and superior cyclic capability for SIHCs is urgently needful.…”

“…Sodium ion hybrid capacitors (SIHCs), which are composed of a battery-type anode and a capacitor-type cathode, have drawn widespread attention due to their high energy density and achievable power delivery. − However, Na + has a larger ionic radius (1.02 Å) than Li + (0.76 Å), which leads to sluggish reaction kinetics and poor cyclic performance. − To date, a few suitable electrode materials, including insertion-type (e.g., carbonaceous and Ti-based materials), conversion-type (e.g., transition metal oxides and sulfides) and alloy-type (e.g., Si, Sn, and Bi), have been used as anode materials for SIHCs. − The insertion-type materials possess good cyclic stability but low theoretical capacities. − Meanwhile, although the conversion-type and alloy-type materials have high theoretical capacities, they suffer from large volume expansion and poor cyclic performance. , Consequently, the rational design of a promising anode material with high reversible capacity and superior cyclic capability for SIHCs is urgently needful.…”