Electrode Architecture Design to Promote Charge‐Transport Kinetics in High‐Loading and High‐Energy Lithium‐Based Batteries

Ji, Wei-xiao; Qu, Huainan; Zhang, Xiaoxiao; Zheng, Dong; Qu, Deyang

doi:10.1002/smtd.202100518

Cited by 32 publications

(27 citation statements)

References 161 publications

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“…Diffusion acts like a courier transporting mass throughout the matrix of a porous electrode and moves the ions to and from an electrode and an electrolyte interface. Detailed discussions on mass transfer can be found in our previous review 10 . A Warburg impedance is used in an equivalent circuit to represent the diffusion process.…”

Section: Impedance Data Modeling and Analysismentioning

confidence: 99%

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Probing process kinetics in batteries with electrochemical impedance spectroscopy

2022

Commun Mater

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Electrochemical impedance spectroscopy provides information on the steady state of an electrochemical redox reaction and its kinetics. For instance, impedance is a very useful technique to investigate kinetics in batteries, such as diffusion processes or charge-transfer reaction dynamics during battery operation. Here, we summarize procedures for conducting reliable impedance measurements on a battery system, including cell configurations, readiness of a system for impedance testing, validation of the data in an impedance spectrum, deconvolution of electrochemical processes based on the distribution of relaxation time and equivalent circuit fitting of the impedance spectrum. The aim of this paper is to discuss key parameters for accurate and repeatable impedance measurements of batteries.

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Section: Impedance Data Modeling and Analysismentioning

confidence: 99%

“…Figure 5 shows the simulation of the electrochemical accessibility of a thick electrode with porosity-gradient design 10 . It is clearly demonstrated in Fig.…”

Section: Impedance Data Modeling and Analysismentioning

confidence: 99%

Probing process kinetics in batteries with electrochemical impedance spectroscopy

2022

Commun Mater

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“…Electron mobility can be tuned through the manipulation of the conductive additives or by using a three-dimensional conductive scaffold . Achieving high ion transport through an electrode demands low tortuosity and can be obtained by several methods as described in a recent detailed review . Notably, the stragies have been applied to insertion electrodes as well as conversion systems including lithium–sulfur and lithium–oxygen batteries.…”

Section: Design and Fabrication Of Thick Electrodesmentioning

confidence: 99%

“…An overview of the current electrode design strategies for optimized tortuosity and porosity is provided. For a more exhaustive summary of these strategies, the reader is referred to recent review articles. , …”

Section: Design and Fabrication Of Thick Electrodesmentioning

confidence: 99%

“…6 Achieving high ion transport through an electrode demands low tortuosity and can be obtained by several methods as described in a recent detailed review. 7 Notably, the stragies have been applied to insertion electrodes as well as conversion systems including lithium− sulfur 8 and lithium−oxygen 9 batteries. Here, some illustrative strategies 1,7,10 and recent developments in the design and fabrication of thick electrodes are presented.…”

Section: Design and Fabrication Of Thick Electrodesmentioning

confidence: 99%

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Thick Electrode Design for Facile Electron and Ion Transport: Architectures, Advanced Characterization, and Modeling

et al. 2022

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Metrics & MoreArticle Recommendations CONSPECTUS:The demand for lithium ion batteries continues to expand for powering applications such as portable electronics, grid-scale energy storage, and electric vehicles. As the application requirements advance, the innovation of lithium ion batteries toward higher energy density and power output is required. Along with the investigation of new materials, an important strategy for increasing battery energy content is to design electrodes with high areal loading to minimize the fraction of nonactive materials such as current collectors, separators, and packaging components, resulting in significant gains in energy content and the reduction of the system-level cost. However, the adoption of thick high areal loading electrodes has been impeded by sluggish charge transport and mechanical instability. With conventional slurry cast electrodes, battery function significantly deteriorates with increases in electrode thickness due to high cell polarization and the incomplete utilization of active materials. Thus, a consideration of approaches that facilitate an understanding and eventual adoption of high-loading electrodes is warranted to enable the deliberate advancement of next-generation batteries. This Account considers three aspects critical to the science and technology of thick high-loading electrodes. The first discussion covers recent approaches to the design and fabrication of high-loading electrodes. Ensuring electrical contact throughout the electrode is accomplished through the manipulation of conductive additives or using a conductive scaffold within the electrode. Ion transport can be facilitated through electrode design and fabrication approaches that deliberately control the electrode porosity and tortuosity. Second, advanced characterization methodologies are presented as the ability to determine the origins of transport limitations provide the insight needed to deliberately approach future designs. Spectroscopic and diffraction methods have been used to characterize the 2D and 3D pore structure and composition of the electrodes. Furthermore, operando methods that yield spatially and temporally resolved information regarding the progression of the electrochemical reaction are highlighted. The third aspect considered is the utilization of modeling. Physically based continuum models linked with the results of experimental characterization have been demonstrated and then allow the rapid simulation of a variety of deliberate electrode designs and their impacts on functional electrochemistry. Variables relevant to the designs can be tested by the model under a series of use conditions to identify those of most promise for a specific application. Finally, an outlook on future opportunities for high-loading battery electrode research is provided to inform and entice practitioners in the field to pursue these important directions of inquiry.

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Cracking‐Controlled Slurry Coating of Mosaic Electrode for Flexible and High‐Performance Lithium–Sulfur Battery

Luo

Wang

Wei

et al. 2022

Advanced Energy Materials

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The realization of high‐performance thick S cathodes is a critical step to achieve high energy density lithium–sulfur (Li–S) batteries. However, it normally requires a complicated and time‐consuming fabrication processes to obtain high‐performance S cathodes with high mass loading. On the other hand, thick S cathodes fabricated with high‐speed slurry coating method show poor flexibility, capacity, and cycle life due to unpredictable electrode cracking. Herein, an industrial‐speed cracking‐controlled slurry coating method to generate mosaic‐like cracks in the S cathode is developed, which provides vertical channels to facilitate the rapid diffusion of electrolyte, adequate space to accommodate the volume expansion during cycling, and strain‐releasing structure to achieve high flexibility. With this simple method, thick Mosaic‐S cathodes (9 mAh cm−2) provide outstanding energy density, long cycle life, and outstanding flexibility under dynamic bending. This work paves the way for scalable fabrication of high‐performance S cathodes in the near future.

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Electrode Architecture Design to Promote Charge‐Transport Kinetics in High‐Loading and High‐Energy Lithium‐Based Batteries

Abstract: Figure 3. Designing interconnected and stable pore structure: a) tomography image and skeleton of a thick electrode with interconnected pore structure. Reproduced with permission.

Cited by 32 publications

References 161 publications

Probing process kinetics in batteries with electrochemical impedance spectroscopy

Probing process kinetics in batteries with electrochemical impedance spectroscopy

Thick Electrode Design for Facile Electron and Ion Transport: Architectures, Advanced Characterization, and Modeling

Cracking‐Controlled Slurry Coating of Mosaic Electrode for Flexible and High‐Performance Lithium–Sulfur Battery

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