Manufacturing Water‐Based Low‐Tortuosity Electrodes for Fast‐Charge through Pattern Integrated Stamping

Abstract

Achieving high energy density and fast charging of lithium‐ion batteries can accelerate the promotion of electric vehicles. However, the increased mass loading causes poor charge transfer, impedes the electrochemical reaction kinetics, and limits the battery charging rate. Herein, this work demonstrated a novel pattern integrated stamping process for creating channels in the electrode, which benefits ion transport and increases the rate performance of the electrode. Meanwhile, the pressure applied during the stamping process improved the contact between electrode and current collector and also enhanced the mechanical stability of the electrode. Compared to the conventional bar‐coated electrode with the same thickness of 155 μm (delivered a discharge capacity of 16 mAh g−1 at the rate of 3 C), the stamped low‐tortuosity LiFePO4 electrode delivered 101 mAh g−1 capacity. Additionally, water was employed as a solvent in this study. Owing to its eco‐friendliness, high scalability, and minimal waste generation, this novel stamping technique inspire a new method for the industrial‐level efficient roll to roll fabrication of fast‐charge electrodes.

Enhancing composite electrode performance: insights into interfacial interactions

“…68 Approaches to enhancing LFP performance include the use of carbon-coated LFP particles or low-tortuosity electrodes. 69,70 Nonetheless, these approaches result in an inevitable decrease in battery bulk energy density. 71 Furthermore, achieving a uniform carbon layer on irregularly shaped LFP particles presents substantial technical challenges.…”

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

“…The ensuing high‐tortuosity channel hampers electrolyte penetration into the electrode and considerably increases the ion‐transfer distance (Figure 4g). [ 72 ] Figure 4f illustrates that a low‐tortuosity electrode shape can improve the electrode's accessibility to the electrolyte and shorten the ion‐transfer path during the battery charge and discharge. Tortuosity is linked to the streamlined length of the electrode thickness and is calculated at various pore locations, resulting in dispersion.…”

“…Instead of scattered tortuosity, narrow tortuosity shows a more regular configuration of pore channels and ease of electrolyte entry. [ 72 ] Low tortuosity can be achieved through pores across both vertical and planar directions by casting large particles into a single‐particle layer in the electrode. [ 78 ] The low tortuosity via pores of single‐particle‐layer electrodes enhances electrolyte infiltration, especially in dense electrodes, and the high inside tortuosity of large secondary particles.…”

“…g) Schematic representation of the low-tortuosity and high-tortuosity electrode structures. Reproduced with the permission [72]. Copyright 2023, Wiley VCH GmbH.…”

A strategy to build high-performance thick electrodes for lithium-ion batteries with enhanced compressive modulus and regulated tortuosity in the phase-inversion process

“…[8][9][10] This deterioration of performance is especially severe in thick electrodes with high tortuosity. [11][12][13] In recent years, various methods have been developed to engineer the architecture of electrodes to facilitate the diffusion of lithium-ions in battery electrodes, such as magnetic templating, 14,15 phase-inversion, [16][17][18][19][20][21][22][23][24][25] channel-drilling, 26,27 freezecasting, [28][29][30][31][32][33][34][35][36] acoustic-eld modulation, 37 nanoarray engineering, 38 stamping process, 39 and screen printing. 40 Among these novel manufacturing methods, phase-inversion is an outstanding approach in terms of efficiency and scalability for generating low-tortuosity structures.…”