Effective Strategy for Enhancing the Performance of Li₄Ti₅O₁₂Anodes in Lithium-Ion Batteries: Magnetron Sputtering Molybdenum Disulfide-Optimized Interface Architecture

Abstract

The interface between the current collector and active material is the primary interface of charge transfer. Herein, we designed an effective strategy to optimize the interface architecture by depositing molybdenum disulfide on the copper foil surface (Cu−MoS 2 ) via magnetron sputtering. The Cu−MoS 2 is directly used as a current collector and supports the Li 4 Ti 5 O 12 anode (Cu−MoS 2 −LTO). Typically, after being cycled at 1 A g −1 for 300 cycles, the capacities of the Cu−LTO cell and Cu−MoS 2 cell are about 114.94 and 128.35 mA h g −1 , respectively, whereas the capacity of the Cu−MoS 2 −LTO cell is as high as 373.9 mA h g −1 with a capacity retention rate of 89.1%. The MoS 2 not only optimizes the interfacial architecture but also provides an additional capacity contribution to the Cu−MoS 2 −LTO cell. Based on scanning electron microscopy and X-ray photoelectron spectroscopy test analysis, we propose a dual interface model. It is revealed that the molybdenum disulfide film can significantly improve the charge-transfer efficiency and uniformity of the interface, reduce internal resistance of the batteries, prevent oxidation of the copper foil, and thereby improve the chemical stability of the current collector. In addition, magnetron sputtering technology has large-scale productivity and greatly enhances the industrial application of this strategy.

Si/a-C Nanocomposites with a Multiple Buffer Structure via One-Step Magnetron Sputtering for Ultrahigh-Stability Lithium-Ion Battery Anodes

“…Meanwhile, the continuous and uniformly distributed amorphous carbon enhances the conductivity of the nanocomposites. , Moreover, magnetron sputtering has the advantages of a mature process, good bonding strength between the film and substrate, and large deposition area. Large areas (400 × 600 mm 2 ) of Cu–Si/a-C electrodes can be produced in our laboratory . In view of the effectiveness of this method, this work highlights the large-scale preparation of ultrahigh-stability silicon–carbon anodes, which is a step towards the practicality of next-generation energy storage.…”

“…Large areas (400 × 600 mm 2 ) of Cu−Si/a-C electrodes can be produced in our laboratory. 34 In view of the effectiveness of this method, this work highlights the large-scale preparation of ultrahigh-stability silicon−carbon anodes, which is a step towards the practicality of nextgeneration energy storage.…”

Low Temperature Deposition of Highly Cyclable Porous Prussian Blue Cathode for Lithium‐Ion Microbattery

“…One widely accepted game changer is that of 3D or porous electrode design with high surface-to-volume ratio, to have interfacial exchanges over an extended surface with better electrolyte accessibility, short ionic diffusion paths, and mass transport kinetics, thereby decoupling the inverse energy/power relationship. [2][3][4][5][6] Various advanced coating techniques like chemical vapor deposition, [7,8] atomic layer deposition (ALD), [9,10] molecular layer deposition, [11] sputtering, [12,13] etc. have been used for conformal coating of active materials on porous structures.…”

“…This is especially true for cathode materials, which need high temperature annealing treatments (≈300-800 °C) for better crystallinity and electrochemical performance, even if performed by state-of-theart ALD, sputtering techniques, or from conventional slurry coating. [13,16,17] While traditional metal oxides, phosphates, or fluoride-based cathodes require high temperature treatment, Prussian blue analogue (PBA) (A x M[Fe(CN) 6 ] y •zH 2 O, where A and M are alkali and transition metal ions, respectively) based cathode materials are synthesized under relatively mild conditions in aqueous medium from easily available low cost precursors. [18] They have an open framework robust structure and the Fe center exhibits a redox potential of ≈3.4 V (vs Li/Li + ), [19] which is ideal for utilization as cathodes for Li-ion batteries.…”

“…This is especially true for cathode materials, which need high temperature annealing treatments (≈300–800 °C) for better crystallinity and electrochemical performance, even if performed by state‐of‐the‐art ALD, sputtering techniques, or from conventional slurry coating. [ 13,16,17 ]…”