An in situ system for simultaneous stress measurement and optical observation of silicon thin film electrodes

Chen, Jian; Yang, Le; Han, Yu; Bao, Yinhua; Zhang, Kailun; Li, Xiang; Pang, Jinhui; Chen, Haosen; Song, Wei‐Li; Wei, Yujie; Fang, Daining

doi:10.1016/j.jpowsour.2019.227227

Cited by 16 publications

(6 citation statements)

References 31 publications

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“…The easy access, low cost, and nondestructiveness of optical microscopy make it a suitable technique for conducting exhaustive and exploratory studies in Li-ion batteries and has been gaining popularity in recent years. − In this work, the change in the reflected light intensity from an NMC cathode is tracked continuously over 3 days and used to infer the local composition change during slow charging over cycles, starting with the formation cycle. The dependence of the reflected light intensity on the Li content has been previously verified in a variety of active materials, including graphite, , silicon, , and LiCoO 2 . Our operando experiments reveal that NMC particles react asynchronously during the first charge of the formation cycle but transition toward uniform (synchronous) reactions in subsequent (dis)charge sequences.…”

supporting

confidence: 74%

“…13−15 In this work, the change in the reflected light intensity from an NMC cathode is tracked continuously over 3 days and used to infer the local composition change during slow charging over cycles, starting with the formation cycle. The dependence of the reflected light intensity on the Li content has been previously verified in a variety of active materials, including graphite, 16,17 silicon, 8,18 and LiCoO 2 . 19 Our operando experiments reveal that NMC particles react asynchronously during the first The numerical simulations show that solid-state diffusion alone cannot explain these observations and the phenomenon requires a spatially varying electric potential across the electrode surface.…”

mentioning

confidence: 72%

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Asynchronous-to-Synchronous Transition of Li Reactions in Solid-Solution Cathodes

et al. 2022

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The composition dynamics regulate the accessible capacity and rate performance of rechargeable batteries. Heterogeneous Li reactions can lead to nonuniform electrochemical activities and amplify mechanical damage in the cell. Here, we employ operando optical microscopy as a laboratory tool to map the spatial composition heterogeneity in a solid-solution cathode for Li-ion batteries. The experiments are conducted at slow charging conditions to investigate the thermodynamic origins. We observe that the active particles charge asynchronously with reaction fronts propagating on the particle surfaces during the first charge, while subsequent (dis)charge cycles transition to a synchronous behavior for the same group of particles. Such transition is understood by computational modeling, which incorporates the dependence of Li diffusivity and interfacial reaction rate on the state of charge. The optical experiments and theoretical modeling provide insight into the reaction heterogeneity of porous electrodes and electrochemical conditioning for layered oxide cathodes.

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confidence: 74%

mentioning

confidence: 72%

Asynchronous-to-Synchronous Transition of Li Reactions in Solid-Solution Cathodes

et al. 2022

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“…The film stress can be measured using methods such as digital image correlation (DIC) or devices such as a laser beam probe detector (LBPD), fiber optical sensor (FOS), and multi optical sensor (MOS), whereas adhesion and flexibility are generally measured separately by tape testing and a flexometer. Chen et al invented an in situ experimental system based on the colorimetric method and MOS technique which can simultaneously observe the morphology and measure the stress [133]. Carrier lifetime can generally be measured by microwave photoconductivity decay (µ-PCD), surface photoelectric voltage (SPV), and quasi-steady-state photoconduction (QSSPC).…”

Section: Performance Characterizationmentioning

confidence: 99%

Recent Developments in Flexible Transparent Electrode

Wang

et al. 2021

Crystals

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With the rapid development of flexible electronic devices (especially flexible LCD/OLED), flexible transparent electrodes (FTEs) with high light transmittance, high electrical conductivity, and excellent stretchability have attracted extensive attention from researchers and businesses. FTEs serve as an important part of display devices (touch screen and display), energy storage devices (solar cells and super capacitors), and wearable medical devices (electronic skin). In this paper, we review the recent progress in the field of FTEs, with special emphasis on metal materials, carbon-based materials, conductive polymers (CPs), and composite materials, which are good alternatives to the traditional commercial transparent electrode (i.e., indium tin oxide, ITO). With respect to production methods, this article provides a detailed discussion on the performance differences and practical applications of different materials. Furthermore, major challenges and future developments of FTEs are also discussed.

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“…[63] Although the traditional MOSS method can directly obtain the stress in the film, there are still some problems in the accuracy of stress. In order to improve the accuracy of stress detection, Chen et al [64] proposed an in-situ method to simultaneously measure the real thickness and curvature of Li x Si film during electrochemical cycle. The color evolution of silicon film is observed by optical microscope, and the real thickness is extracted directly from the relationship between color and film thickness.…”

Section: Multi-beam Optical Stress Sensor (Moss)mentioning

confidence: 99%

Development of Small‐Scale Monitoring and Modeling Strategies for Safe Lithium‐Ion Batteries

Zhang

Chen

Wang

et al. 2021

Batteries & Supercaps

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Lithium‐ion batteries (LIBs) have the advantages of high energy density, stable working voltage, long cycling life, and no memory effect. They have been widely used as power sources for electric vehicles (EVs) and hybrid electric vehicles (HEVs). However, during periods of usage or storage, some unfavorable factors such as thermal runaway, volumetric expansion, and growth of lithium dendrites can severely reduce the reliability and safety of LIBs. Therefore, an accurate health estimation system and a reliable life expectancy strategy toward LIBs have been proved significantly important. However, due to the large volume and high price, most characterization methods in the laboratory cannot be applied directly to commercial electric devices. Therefore, small portable monitor methods are more practical. In this review, we first systematically reviewed the recent progress of modeling methods towards LIBs. Some typical modeling strategies (e. g., thermal models, electrical models and aging models) and advanced sensors which can be imbedded in LIBs are emphatically introduced and compared. At last, some promising directions of development on portable in‐situ monitor strategies are also predicted and supposed.

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An in situ system for simultaneous stress measurement and optical observation of silicon thin film electrodes

Cited by 16 publications

References 31 publications

Asynchronous-to-Synchronous Transition of Li Reactions in Solid-Solution Cathodes

Asynchronous-to-Synchronous Transition of Li Reactions in Solid-Solution Cathodes

Recent Developments in Flexible Transparent Electrode

Development of Small‐Scale Monitoring and Modeling Strategies for Safe Lithium‐Ion Batteries

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