SIMS and HR-XPS characterization of lithiated graphite from the magnetic fusion device RFX-mod

Rais, B.; Ostrowski, E. T.; Canton, A.; Skinner, C.H.; Barison, S.; Fiameni, S.; Koel, Bruce E.

doi:10.1016/j.apsusc.2021.150830

Cited by 16 publications

(3 citation statements)

References 78 publications

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“…43,44 Along with this, formation of Li2CO3 is confirmed from the peaks present at 289.75 eV, 55.15 eV and 532.01 eV corresponding to the C 1s, Li 1s and O 1s regions respectively. 45,46 The presence of Li2CO3 can hinder the Li-exchange between the electrolyte and the electrode which negatively affects the performance of the cell. 33,34 On the other hand, Li anode in the cell with LPIL interlayer is intact and the formation of lithium fluoride, LiF, on the Li-metal surface is evident from the peaks at 684.4 eV peak in F 1s and 56.2 eV in Li 1s regions 47 .…”

Section: Post-cycling Studies Of the Li2pc Interlayermentioning

confidence: 99%

Dilithium phthalocyanine - A Single Ion Transport Interfacial layer for Solid-State Lithium Batteries

Chesta,

Kalleshappa,

Srinivasan

2024

Preprint

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All-solid-state batteries possess several advantages including high safety, flexibility to use high-capacity metal anodes and are projected to be the next generation energy storage devices. Garnet-type cubic Li7La3Zr2O12 (LLZO) solid electrolyte is of particular interest due to its high ionic conductivity under ambient conditions and compatibility with Li metal. However, large electrode/electrolyte interfacial resistance constraints their development. Herein, the use of a highly lithium ion conducting dilithium phthalocyanine (Li2Pc) as an interlayer is proposed to effectively suppress the high impedance at the interface thus improving the electrode-electrolyte contact. Fast Li+ mobility and high dielectric constant of dilithium phthalocyanine enhance the kinetics of Li+ transport across the interface. A significant reduction in overpotential and very stable stripping/plating cycling are observed in lithium symmetric cells upon introducing Li2Pc interlayer as compared to the use of bare tantalum doped lithium lanthanum zirconium oxide (LLZTO) electrolyte. Cells comprising interlayer-modified Li|LLZTO|LiFePO4 show high capacity with excellent cycling and rate capability. The performance of full cells using lithiated graphite and lithium titanate anodes has also been evaluated. This study presents a promising application of garnet electrolytes towards the advancement of solid-state lithium batteries.

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Section: Post-cycling Studies Of the Li2pc Interlayermentioning

confidence: 99%

Dilithium phthalocyanine - A Single Ion Transport Interfacial layer for Solid-State Lithium Batteries

Chesta,

Kalleshappa,

Srinivasan

2024

Preprint

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“…For the disk paired with matrix graphite, the dominant chemical bond is C=O at 200 °C, 400 °C, and 500 °C, with a peak position of 531.5 eV [31,33,34]. For the disk paired with impregnated graphite, there is an extra C-O-P bond (532.9 eV), in addition to C=O bond (531.5 eV) [35][36][37], at 400 °C and 500 °C, which indicates that a high-temperature frictioninduced chemical reaction between the phosphate and graphite occurred on the contact interface, in addition to the oxidation of graphite. Figure 11 shows the full XPS spectra at 500 °C and the fine spectra of the Ni 2p, Cr 2p, and Fe 2p of the wear tracks of the counterpart disks at 500 °C.…”

Section: Structure and Composition Of The Graphite Friction-transferr...mentioning

confidence: 99%

Study on the Tribological Behavior and the Interaction between Friction and Oxidation of Graphite Reinforced by Impregnated Phosphate at High Temperatures

et al. 2023

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The stability of the graphite seal device is a key factor for the normal operation of aero engines. However, conventional graphite exhibits poor comprehensive performance due to its porous structure, which limits its application at high temperatures. Therefore, in this paper, phosphate was used to impregnated graphite pores, and the interaction between the friction, wear, and oxidation of phosphate-impregnated graphite against superalloy at high temperatures was studied through pin-on-disk friction tests. The results revealed that the coefficient of friction (COF) of matrix graphite fluctuated greatly, from 0.07 to 0.17, in the range of 100 °C to 500 °C, while the COF of impregnated graphite was stable, at around 0.13, from 100 °C to 500 °C. The wear rates of the two types of graphite were close from 20 °C to 300 °C, while the wear rate of the impregnated graphite was significantly lower than that of the matrix graphite at higher temperatures, from 400 °C and 500 °C. The reason was that the impregnated phosphate reacted with graphite at a high temperature, forming the inert site which helped to inhibit the oxidation and maintain the mechanical properties of the impregnated graphite at high temperatures. In addition, the impregnated graphite could maintain better integrity of the contact surface and reduce the inclusion of large hard metal oxides, thus effectively reducing the abrasive wear of the disk. Therefore, the wear depth of the superalloy disk samples with impregnated graphite was significantly lower than that of the matrix graphite. The results promote the application of phosphate-impregnated graphite under the high temperature conditions of aero engines.

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“…To understand how Li atoms are distributed within individual fibres with a diameter of ~5 µm, the lateral spatial resolution of the analysis technique needs to be in the sub-micrometre range. Techniques with sufficiently high spatial resolution that previously have been used to analyse lithium-containing materials are electron energy loss spectroscopy (EELS) coupled to transmission electron microscopy (TEM) [15,16], atom probe tomography (APT) [17][18][19][20], secondary ion mass spectroscopy (SIMS) [21,22], energy-dispersive X-ray spectroscopy (EDS) coupled to scanning electron microscopy (SEM) [23,24], and Auger electron spectroscopy (AES) [25][26][27][28][29][30]. Among them, AES is a technique that is well suited to analyse Li in a carbon fibre for the following reasons: its detection sensitivity to Li is high, since the signal yield of Auger electrons increases with decreasing atomic number [31]; the analysis is none-destructive; with ion sputtering, it can provide composition depth profiles; sample preparation is relatively easy; the allowed sample size is large (in the cm range); the ultimate spatial resolution is high, ~10 nm; and it can distinguish between different species of Li [27,32].…”

Section: Introductionmentioning

confidence: 99%

Lithiated Carbon Fibres for Structural Batteries Characterised with Auger Electron Spectroscopy

Johansen

Tam

et al. 2023

Preprint

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SIMS and HR-XPS characterization of lithiated graphite from the magnetic fusion device RFX-mod

Cited by 16 publications

References 78 publications

Dilithium phthalocyanine - A Single Ion Transport Interfacial layer for Solid-State Lithium Batteries

Dilithium phthalocyanine - A Single Ion Transport Interfacial layer for Solid-State Lithium Batteries

Study on the Tribological Behavior and the Interaction between Friction and Oxidation of Graphite Reinforced by Impregnated Phosphate at High Temperatures

Lithiated Carbon Fibres for Structural Batteries Characterised with Auger Electron Spectroscopy

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