Fast electron transfer kinetics on novel interconnected nanospheres of graphene layers electrodes

Peterlevitz, Alfredo C.; May, Paul; Harniman, Robert L.; Jones, J.A.; Ceragioli, Helder José

doi:10.1016/j.tsf.2016.09.044

Cited by 8 publications

(6 citation statements)

References 33 publications

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“…[26][27][28] In addition, it has been well recognized that the surface structure of electrodes directs electron transfer (ET) reactions in electrochemistry and specific surface structures can drive the ET faster. 29,30) The reaction conducted at the electrodes is also sensitive to the surface structure. Therefore, the observed peak current (I p ) and peak potential separation (ΔE p ) corresponded to electrode porosity and ET reactions.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of lithium cobalt oxide films deposited by radio frequency magnetron sputtering as thin-film battery cathodes

Jan¹,

Lee²,

Yu³

et al. 2019

Jpn. J. Appl. Phys.

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Herein, we describe the fabrication of LiCoO2 thin films by high-frequency (27.12 MHz) magnetron sputtering and investigate the effects of sputtering power and Ar/O2 ratio on their morphological and electrochemical properties. Films produced at higher sputtering powers and O2 proportions are shown to exhibit increased porosity and a greater number of surface active sites. The discharge capacity of the film prepared at a sputtering power of 180 W and an Ar/O2 ratio of 1/2 is determined as 22.894 μAh μm–1 cm–2 using half-cell electrochemical testing at 0.2 C for 20 charge–discharge cycles, and ∼90% of the 0.2 C discharge capacity is retained at 1.5 C. Finally, we compare films deposited at 27.12 MHz with those deposited at 13.56 MHz, showing that the former feature the advantages of higher deposition rate and increased surface porosity, which results in excellent electrochemical performance and good rate capability.

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Section: Resultsmentioning

confidence: 99%

Evaluation of lithium cobalt oxide films deposited by radio frequency magnetron sputtering as thin-film battery cathodes

Jan¹,

Lee²,

Yu³

et al. 2019

Jpn. J. Appl. Phys.

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“…37,38 The mechanisms (e.g., vapor-liquidsolid or vapor-solid-solid) widely used to explain the growth of laminar graphene, vertically aligned carbon nanotubes or graphene nanoribbons can not be directly applied for VG growth as the process requires no catalyst. [39][40][41][42][43] Details on the growth mechanisms and parameter control of plasma-enabled growth of VGs can be found in our previous reviews. 2,6 Raman and XPS analysis…”

Section: Morphology and Microstructure Of Vgsmentioning

confidence: 99%

Wettability of vertically-oriented graphenes with different intersheet distances

Shuai

Kong

et al. 2017

RSC Adv.

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“…This matches reported graphene interplanar distances, showcasing the ability to transform the precursor to LIG in the presence of the SiNP. 30,31 The composite surface was analyzed using Raman spectroscopy to verify the presence of silicon and characterize the carbon species formed on the current collector, which is displayed in Figure 3A. The Raman spectra revealed two prominent peaks located between 1340 and 1582 cm −1 , corresponding to the D and G bands, respectively, and a peak at 518 cm −1 indicating the presence of silicon.…”

Section: Structural Analysismentioning

confidence: 99%

Pioneering the direct large‐scale laser printing of flexible “graphenic silicon” self‐standing thin films as ultrahigh‐performance lithium‐ion battery anodes

Kothuru,

Cohen,

Daffan

et al. 2024

Carbon Energy

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Recent technological advancements, such as portable electronics and electric vehicles, have created a pressing need for more efficient energy storage solutions. Lithium‐ion batteries (LIBs) have been the preferred choice for these applications, with graphite being the standard anode material due to its stability. However, graphite falls short of meeting the growing demand for higher energy density, possessing a theoretical capacity that lags behind. To address this, researchers are actively seeking alternative materials to replace graphite in commercial batteries. One promising avenue involves lithium‐alloying materials like silicon and phosphorus, which offer high theoretical capacities. Carbon–silicon composites have emerged as a viable option, showing improved capacity and performance over traditional graphite or pure silicon anodes. Yet, the existing methods for synthesizing these composites remain complex, energy‐intensive, and costly, preventing widespread adoption. A groundbreaking approach is presented here: the use of a laser writing strategy to rapidly transform common organic carbon precursors and silicon blends into efficient “graphenic silicon” composite thin films. These films exhibit exceptional structural and energy storage properties. The resulting three‐dimensional porous composite anodes showcase impressive attributes, including ultrahigh silicon content, remarkable cyclic stability (over 4500 cycles with ∼40% retention), rapid charging rates (up to 10 A g−1), substantial areal capacity (>5.1 mAh cm−2), and excellent gravimetric capacity (>2400 mAh g−1 at 0.2 A g−1). This strategy marks a significant step toward the scalable production of high‐performance LIB materials. Leveraging widely available, cost‐effective precursors, the laser‐printed “graphenic silicon” composites demonstrate unparalleled performance, potentially streamlining anode production while maintaining exceptional capabilities. This innovation not only paves the way for advanced LIBs but also sets a precedent for transforming various materials into high‐performing electrodes, promising reduced complexity and cost in battery production.

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Fast electron transfer kinetics on novel interconnected nanospheres of graphene layers electrodes

Cited by 8 publications

References 33 publications

Evaluation of lithium cobalt oxide films deposited by radio frequency magnetron sputtering as thin-film battery cathodes

Evaluation of lithium cobalt oxide films deposited by radio frequency magnetron sputtering as thin-film battery cathodes

Wettability of vertically-oriented graphenes with different intersheet distances

Pioneering the direct large‐scale laser printing of flexible “graphenic silicon” self‐standing thin films as ultrahigh‐performance lithium‐ion battery anodes

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