Engineering layer structure of MoS2-graphene composites with robust and fast lithium storage for high-performance Li-ion capacitors

Chemical Mass Production of MoS2/Graphene van der Waals Heterostructure as a High‐Performance Li‐ion Intercalation Host

“…[49,50] Moreover, the Δk value for MoS 2 /GR heterostructure is close to the value of monolayer MoS 2 (20.2-21.2 cm À 1 ), implying that single layer-like MoS 2 exists in MoS 2 /GR heterostructure. [26,51,52] In addition, the characteristic peaks of GR at around 1350 cm À 1 (disorder-induced Dband) and 1580 cm À 1 (graphitic G-band) are also observed in both samples.…”

“…The red shift of the A 1g peak (4.9 cm −1 ) in MoS 2 /GR heterostructure indicates a thinner layer structure of MoS 2 and a diminished interlayer vdW force . Moreover, the Δk value for MoS 2 /GR heterostructure is close to the value of monolayer MoS 2 (20.2–21.2 cm −1 ), implying that single layer‐like MoS 2 exists in MoS 2 /GR heterostructure . In addition, the characteristic peaks of GR at around 1350 cm −1 (disorder‐induced D‐band) and 1580 cm −1 (graphitic G‐band) are also observed in both samples.…”

Anatase TiO2 Confined in Carbon Nanopores for High‐Energy Li‐Ion Hybrid Supercapacitors Operating at High Rates and Subzero Temperatures

“…[2][3][4] However, the low specific capacitance of conventional supercapacitor electrodes and narrow operation voltage window lead to a limited energy density, which is highly undesirable and thus creates a barrier to their further applications. Over the past decade, metal oxides (e.g., Nb 2 O 5[9] and MoO 3[10]), dichalcogenides (e.g., MoS 2 ), [11] and carbides (e.g., Ti 3 C 2 [12] and Nb 2 C, [13] known as MXenes) have been widely investigated as high-rate Li-ion hybrid supercapacitors (Li-HSCs) hold great promise in future electrical energy storage due to their relatively high power and energy density. [6] As an asymmetric system, Li-HSCs generally consist of an intercalation (LIB-like) electrode and a capacitive (EDLClike) electrode.…”

“…), dichalcogenides (e.g., MoS 2 ), [11] and carbides (e.g., Ti 3 C 2 [12] and Nb 2 C, [13] known as MXenes) have been widely investigated as high-rate Li-ion hybrid supercapacitors (Li-HSCs) hold great promise in future electrical energy storage due to their relatively high power and energy density. However, a major challenge lies in the slow kinetics of Li-ion intercalation/extraction within metal-oxide electrodes.…”

“…To bridge the gap between LIBs and EDLCs, it is critical for Li-HSCs to achieve a tradeoff between power and energy, which means the intercalation/extraction process at the LIB electrode should couple with the ion adsorption/desorption process at the capacitive electrode. Over the past decade, metal oxides (e.g., Nb 2 O 5 [9] and MoO 3 [10] ), dichalcogenides (e.g., MoS 2 ), [11] and carbides (e.g., Ti 3 C 2 [12] and Nb 2 C, [13] known as MXenes) have been widely investigated as high-rate Li-ion hybrid supercapacitors (Li-HSCs) hold great promise in future electrical energy storage due to their relatively high power and energy density. The ion adsorption/ desorption at electrode surface is an ultrafast physical process, while the intercalation/extraction process is typically slow and limited by the kinetics of Li ion diffusion and electron transport within a solid phase.…”