Designing Low Tortuosity Electrodes through Pattern Optimization for Fast‐Charging

Abstract

The development of fast-charging technologies is crucial for expediting the progress and promotion of electric vehicles. In addition to innovative material exploration, reduction in the tortuosity of electrodes is a favored strategy to enhance the fast-charging capability of lithium-ion batteries by optimizing the ion-transfer kinetics. To realize the industrialization of low-tortuosity electrodes, a facile, cost-effective, highly controlled, and high-output continuous additive manufacturing roll-to-roll screen printing technology is proposed to render customized vertical channels within electrodes. Extremely precise vertical channels are fabricated by applying the as-developed inks, using LiNi 0.6 Mn 0.2 Co 0.2 O 2 as the cathode material. Additionally, the relationship between the electrochemical properties and architecture of the channels, including the pattern, channel diameter, and edge distance between channels, is revealed. The optimized screen-printed electrode exhibited a seven-fold higher charge capacity (72 mAh g −1 ) at a current rate of 6 C and superior stability compared with that of the conventional bar-coated electrode (10 mAh g −1 , 6 C) at a mass loading of 10 mg cm −2 . This roll-to-roll additive manufacturing can potentially be applied to various active materials printing to reduce electrode tortuosity and enable fast charging in battery manufacturing.

Stereoselective reduction of diarylmethanones via a ketoreductase@metal–organic framework

“…Because of its high surface area, excellent stability, and low cytotoxicity, zeolitic imidazolate framework-8 (ZIF-8) composed of Zn 2+ coordinated with 2-methylimidazole (2-mIM) is one of the most popular and well-studied MOF materials. 23–26 In this study, ZIF-8 was selected as the candidate MOF material, and the controlled co-precipitation strategy with polyvinylpyrrolidone (PVP) as the capping agent was adopted. 2,27 Of note, a low 2-mIM/Zn molar ratio of 8 : 1 was used to prepare the KmCR2@ZIF biocomposites, as previous studies indicated that biocomposites synthesized with a low 2-mIM/Zn molar ratio possessed higher enzyme loadings and specific activities than those fabricated with a high 2-mIM/Zn molar ratio.…”

Solution-Processable and Printable Two-Dimensional Transition Metal Dichalcogenide Inks

“…Generally, screen printing holds the advantage of faster printing than inkjet printing, which needs to sequentially define each pattern region. For even faster printing, a roll-to-roll (R2R) form of screen printing was demonstrated by employing highly efficient cylinder presses. , In contrast to flat-screen printing, the screen, cylinder, and substrate move synchronously, while the presses and squeegee remain stationary. The R2R process allows for high-throughput printing with operation speeds of up to 80 m 2 ·s –1 .…”

Wood Derived Flexible and Spongy Architectures for Advanced Electrochemical Energy Storage and Conversion

“…Reproduced with permission. [ 202 ] Copyright 2023, Wiley VCH GmbH. b) Schematic design and fabrication of fiber‐aligned thick electrode followed by rolling into cylindrical shape electrode.…”