In Situ, Time-Resolved Raman Spectromicrotopography of an Operating Lithium-Ion Battery

Luo, Yu; Cai, Wen; Xing, Xuekun; Scherson, Daniel Alberto

doi:10.1149/1.1627972

Cited by 36 publications

(29 citation statements)

References 14 publications

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“…(ii) One could argue that the colorimetry method probes only the near-surface region of composite electrodes and thus gives no direct information about depth profiles of lithium content. Indeed, we demonstrated that the current density distribution across the electrode thickness (perpendicular to the current collector) is not necessarily uniform [23,24]. However, in this study we used rela- tively thin electrodes, low current densities, and the lithium flux was mainly parallel to the current collectors, as schematically shown in Fig.…”

Section: Resultsmentioning

confidence: 86%

Colorimetric determination of lithium-ion mobility in graphite composite electrodes

Maire

Kaiser

Scheifele

et al. 2010

Journal of Electroanalytical Chemistry

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Section: Resultsmentioning

confidence: 86%

Colorimetric determination of lithium-ion mobility in graphite composite electrodes

Maire

Kaiser

Scheifele

et al. 2010

Journal of Electroanalytical Chemistry

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“…This strategy would enable total light absorption with single layers of WO 3 particles, thereby avoiding deleterious particle–particle interactions. Our single particle electrochromism imaging approach can be generally applied to transition metal oxides (49, 50), graphite (51, 52) and Ni(OH) 2 battery materials (53) whose optical properties change during ion insertion. Single particle electro-optical imaging of ion-insertion/-extraction processes can guide applied research related to batteries, fuel cells, electrochemical capacitors, and sensors.…”

Section: Resultsmentioning

confidence: 99%

Influence of single-nanoparticle electrochromic dynamics on the durability and speed of smart windows

Evans

Ellingworth

Cashen

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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Nanomaterials have tremendous potential to increase electrochromic smart window efficiency, speed, and durability. However, nanoparticles vary in size, shape, and surface defects, and it is unknown how nanoparticle heterogeneity contributes to particle-dependent electrochromic properties. Here, we use single-nanoparticle-level electro-optical imaging to measure structure–function relationships in electrochromic tungsten oxide nanorods. Single nanorods exhibit a particle-dependent waiting time for tinting (from 100 ms to 10 s) due to Li-ion insertion at optically inactive surface sites. Longer nanorods tint darker than shorter nanorods and exhibit a Li-ion gradient that increases from the nanorod ends to the middle. The particle-dependent ion-insertion kinetics contribute to variable tinting rates and magnitudes across large-area smart windows. Next, we quantified how particle–particle interactions impact tinting dynamics and reversibility as the nanorod building blocks are assembled into a thin film. Interestingly, single particles tint 4 times faster and cycle 20 times more reversibly than thin films made of the same particles. These findings allow us to propose a nanostructured electrode architecture that optimizes optical modulation rates and reversibility across large-area smart windows.

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“…To analyze the structure of the electrode in connection with the reaction, various methods, such as nuclear magnetic resonance (NMR), 8,9 X-ray diffraction (XRD), 10,11 X-ray absorption fine structure (XAFS), scanning Auger microscopy (SAM), 12 and Raman spectroscopy, [13][14][15][16][17][18][19][20][21] have been used. Also, the three-dimensional structure of the vacancy in electrodes has been well-studied by both simulation, 22,23 and instrumental analysis.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, many efforts have been made to develop in situ techniques. [13][14][15][16][17][18][19][20][21] However, most of them only measure the spectra. Therefore, it has not been possible to obtain the spatial distribution of the degree of reaction process in a single charge/discharge cycle.…”

Section: Introductionmentioning

confidence: 99%

Development of In Situ Cross-Sectional Raman Imaging of LiCoO<sub>2</sub> Cathode for Li-ion Battery

et al. 2015

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A novel in situ Raman imaging technique has been developed to visualize the Li-ion battery reaction during the charge/discharge operation. A specially designed cell enables to measure Raman spectra at high speed so that the in situ measurements are carried out during the reaction. The distribution of the state of charge in cross-section of LiCoO 2 cathode has been visualized as a demonstration. Inhomogeneous state of charge distribution is observed and there are some active materials where Li + does not completely return after discharging. This technique enables to evaluate not only the electrode performance but also battery degradation, and thus may promote the realization of the next generation batteries.

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In Situ, Time-Resolved Raman Spectromicrotopography of an Operating Lithium-Ion Battery

Cited by 36 publications

References 14 publications

Colorimetric determination of lithium-ion mobility in graphite composite electrodes

Colorimetric determination of lithium-ion mobility in graphite composite electrodes

Influence of single-nanoparticle electrochromic dynamics on the durability and speed of smart windows

Development of In Situ Cross-Sectional Raman Imaging of LiCoO<sub>2</sub> Cathode for Li-ion Battery

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