HAXPES Applications to Advanced Materials

Kobayashi, Keisuke

doi:10.1007/978-3-319-24043-5_18

Cited by 4 publications

(2 citation statements)

References 247 publications

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“…The less intensive peak at approximately 289.1 eV can be ascribed to the C 1s → π*(C–F) resonance of the PVDF binder, whereas the peak at 293.0 eV corresponds to the C 1s → σ*(C–H) resonance. At 295.5 eV, resonances are generated from C 1s → σ*(C–C) of PVDF . After surface modification, the peaks shift to a higher energy of 286.0 eV, which represents the C 1s → π* resonance for C–N on the BMI structure.…”

Section: Results and Discussionmentioning

confidence: 99%

Interface Interaction Behavior of Self-Terminated Oligomer Electrode Additives for a Ni-Rich Layer Cathode in Lithium-Ion Batteries: Voltage and Temperature Effects

Wang¹,

Alemu²,

Yeh³

et al. 2019

ACS Appl. Mater. Interfaces

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Self-terminated oligomer additives synthesized from bismaleimide and barbituric acid derivatives improve the safety and performance of lithium-ion batteries (LIBs). This study investigates the interface interaction of these additives and the cathode material. Two additives were synthesized by Michael addition (additive A) and aza-Michael addition (additive B). The electrochemical performances of bare and modified LiNi0.6Mn0.2Co0.2O2 (NMC622) materials are studied. The cycling stability and rate capability of NMC622 considerably improve on surface modification with additive B. According to the differential scanning calorimetry results, the exothermic heat of fully deliathiated NMC622 is dramatically decreased through surface modification with both additives. The electrode surface kinetics and interface interaction phenomena of the additives are determined through surface plasma resonance measurements in operando gas chromatography–mass spectroscopy (GCMS) and in situ soft X-ray absorption spectroscopy (XAS). The binding rate constant of additive B onto NMC622 particles is 1.2–2.3 × 104 M–1 s–1 in the temperature range of 299–311 K, which is ascribed to the strong binding affinity toward the electrode surface. This affinity enhances Li+ diffusion, which allows the electrode modified by additive B to provide high electrochemical performance with superior thermal stability. In operando GCMS reveals that gas evolution due to the electrolyte degradation at the NMC622 surface contributes to safety hazards in the bare NMC622 material. In situ soft XAS indicates the occurrence of structural transformation in the bare NMC622 material after it is fully charged and at elevated temperatures. The NMC622 material is stabilized by incorporating additives. The unique performance of additive B can be attributed to its linear structure that allows superior electrode surface adhesion compared with that of additive A. Therefore, this study presents an optimized working principle of self-terminated oligomers, which can be developed and applied to improve the safety and performance of LIBs.

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Section: Results and Discussionmentioning

confidence: 99%

Interface Interaction Behavior of Self-Terminated Oligomer Electrode Additives for a Ni-Rich Layer Cathode in Lithium-Ion Batteries: Voltage and Temperature Effects

Wang¹,

Alemu²,

Yeh³

et al. 2019

ACS Appl. Mater. Interfaces

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“…HAXPES have been used to investigate the chemical compositions and energy bands of metal-oxide-semiconductor (MOS) devices, which contain various oxides and semiconductor materials. [2][3][4][5] It has also been used to investigate voltage-induced changes in chemical bonding states in metal-insulator-metal (MIM) resistance-change memory. 6,7) In this work, we used HAXPES to investigate a recently proposed HfO 2 /SiO 2 -based interfacial-dipole-modulation (IDM) structure for MOS-type memory.…”

mentioning

confidence: 99%

Using hard X-ray photoelectron spectroscopy to study a SiO₂/HfO₂-based interface dipole modulation stack embedded in a metal–insulator-metal structure

Kirihara

Tsujiguchi

Ito

et al. 2022

Appl. Phys. Express

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Hard X-ray photoelectron spectroscopy was used to examine the interface dipole modulation of SiO2/1-monolayer titanium oxide/HfO2 stack embedded in a metal-insulator-metal structure. Reversible shifts in the Si 1s, Hf 3d, and Ti 1s photoelectron peaks were induced by electrical stress, and they indicate switching of the potential profile inside the SiO2/titanium oxide/HfO2 stack. Moreover, a proportion change in the Ti3+ component of the stack correlates with the potential switching, and that correlation suggests that the structural change around the interface titanium atoms leads to the interface dipole modulation.

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Exploring the Surface Kinetic and Electrochemical Behaviors of the Cathode Material Modified with Safety Additives in Lithium-Ion Batteries

Alemu,

Wang,

Kerayu

2024

Preprint

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HAXPES Applications to Advanced Materials

Cited by 4 publications

References 247 publications

Interface Interaction Behavior of Self-Terminated Oligomer Electrode Additives for a Ni-Rich Layer Cathode in Lithium-Ion Batteries: Voltage and Temperature Effects

Interface Interaction Behavior of Self-Terminated Oligomer Electrode Additives for a Ni-Rich Layer Cathode in Lithium-Ion Batteries: Voltage and Temperature Effects

Using hard X-ray photoelectron spectroscopy to study a SiO₂/HfO₂-based interface dipole modulation stack embedded in a metal–insulator-metal structure

Exploring the Surface Kinetic and Electrochemical Behaviors of the Cathode Material Modified with Safety Additives in Lithium-Ion Batteries

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HAXPES Applications to Advanced Materials

Cited by 4 publications

References 247 publications

Interface Interaction Behavior of Self-Terminated Oligomer Electrode Additives for a Ni-Rich Layer Cathode in Lithium-Ion Batteries: Voltage and Temperature Effects

Interface Interaction Behavior of Self-Terminated Oligomer Electrode Additives for a Ni-Rich Layer Cathode in Lithium-Ion Batteries: Voltage and Temperature Effects

Using hard X-ray photoelectron spectroscopy to study a SiO2/HfO2-based interface dipole modulation stack embedded in a metal–insulator-metal structure

Exploring the Surface Kinetic and Electrochemical Behaviors of the Cathode Material Modified with Safety Additives in Lithium-Ion Batteries

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Using hard X-ray photoelectron spectroscopy to study a SiO₂/HfO₂-based interface dipole modulation stack embedded in a metal–insulator-metal structure