Li-ion diffusion in Li intercalated graphite C6Li and C12Li probed by μ+SR

Umegaki, Izumi; Kawauchi, Saju; Sawada, Hiroshi; Nozaki, Hirōshi; Higuchi, Yuki; Miwa, Kenji; Kondo, Yasuhito; Må̊nsson, Martin; Telling, Mark; Coomer, Fiona C.; Cottrell, Stephen P.; Sasaki, Tsuyoshi; Kobayashi, Tetsuro; Sugiyama, Jun

doi:10.1039/c7cp02047c

Cited by 49 publications

(51 citation statements)

References 42 publications

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“…In order to separate the signal from the Cu foil, we have measured the ZF-and LF-µ + SR spectra for Cu, which exhibit a Kubo-Toyabe (KT) type relaxation at low temperatures. However, the implanted µ + starts to diffuse at temperatures above 150 K [4]. In the fitting of the µ + SR spectrum for the anode sheets, the µ + SR parameters for the Cu foil were fixed to the values obtained in the Cu foil measurements [4].…”

Section: µ + Srmentioning

confidence: 99%

“…However, the implanted µ + starts to diffuse at temperatures above 150 K [4]. In the fitting of the µ + SR spectrum for the anode sheets, the µ + SR parameters for the Cu foil were fixed to the values obtained in the Cu foil measurements [4]. Thus, the ZF-and LF-time spectra for C 12 Li 0.92 and C 18 Li 0.90 were fitted by a combination of the three dynamic KT functions (G KT ) and a time independent background signal coming from the µ + s stopped in the Ti sample cell.…”

Section: µ + Srmentioning

confidence: 99%

“…A BG , A Cu , and A Li are the asymmetries of the background, Cu foil, and Li intercalated graphite. The following three parameters, ∆ Cu , ν Cu , and λ Cu were fixed to the values obtained in the previous measurements [4]. Fig.3(a)].…”

Section: µ + Srmentioning

confidence: 99%

“…Furthermore, µ + SR showed that D Li in solid electrolyte materials is higher than in cathode materials [3]. Recently, we have also found that Li diffusion in graphite, which is commonly used as an anode material of a Li-ion battery, is detectable with µ + SR [4]. During charge (discharge) process of a graphite anode, Li intercalates (deintercalates) into (from) the graphite, which consists of graphene layers.…”

Section: Introductionmentioning

confidence: 96%

“…1). We have previously investigated Li diffusion in C 6 Li and C 12 Li with µ + SR [4]. Here, C 6 Li corresponds to a fully Li intercalated graphite in a stage 1 (n=1) structure, whereas C 12 Li in a stage 2 (n=2) structure.…”

Section: Introductionmentioning

confidence: 99%

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Battery Materials Research with Muon Beam

Umegaki

Higuchi

Nozaki

et al. 2019

Proceedings of the 3rd International Symposium of Quantum Beam Science at Ibaraki University "Quantum Beam Science in Biology A

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We applied a positive muon spin rotation and relaxation (µ + SR) technique to battery materials research by investigating Li diffusion in cathode and electrolyte materials. Recently, we have found that Li diffusion in graphite, which is commonly used as an anode material in Li-ion batteries, is detectable with µ + SR. Following upon the initial µ + SR measurements on the Li intercalated graphites, C 6 Li and C 12 Li, µ + SR spectra were also measured for C 12 Li 0.92 and C 18 Li 0.90 posing a slightly different occupancy in the same stage structure as those of C 6 Li and C 12 Li. The temperature dependence of diffusive nature in C 12 Li 0.92 and C 18 Li 0.90 was found to be similar in nature to those in C 6 Li and C 12 Li. Such a diffusion was found to start to occur approximately by 50 K lower than those of C 6 Li and C 12 Li. This suggests that Li starts to diffuse at lower temperatures in the nonstoichiometric Li intercalated graphite samples than that in the stoichiometric samples.

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Section: µ + Srmentioning

confidence: 99%

Section: µ + Srmentioning

confidence: 99%

Section: µ + Srmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Battery Materials Research with Muon Beam

Umegaki

Higuchi

Nozaki

et al. 2019

Proceedings of the 3rd International Symposium of Quantum Beam Science at Ibaraki University "Quantum Beam Science in Biology A

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Flatten the Li‐ion Activation in Perfectly Lattice‐Matched MXene and 1T‐MoS₂ Heterostructures via Chemical Functionalization

Guan

Yan

Cai

2022

Adv Materials Inter

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The complexity of the ionic and electronic dynamics in MXene based hybrids, which are normally involved for device integration, triggers both challenges and opportunities for its application. Herein, as a prototype of metallic hybrids of MXene, heterostructures consisting of Ti3C2T2 (T = None, O and F atoms) and metallic MoS2 (1T phase) are investigated for lithium‐ion battery (LIB) applications. It is found that different surface atomic groups in MXene significantly alter the affinity, redox reaction and kinetics of Li atoms in the interface of the Ti3C2T2 and 1T‐MoS2. Through examining the three possible pathways of Li by first‐principles calculations and ab‐initio molecular dynamics, the diffusion curve becomes significantly flattened from the naked to O‐ and F‐terminated Ti3C2 MXene with activation barriers reducing dramatically from 0.80 to 0.22 and 0.29 eV, respectively, and accordingly promoted diffusion coefficients. The functionalization with O or F eliminates the steric hindrance of Li intercalation by breaking the strong interaction between two layers and provides additional adsorption sites for Li diffusion in the meantime. The work suggests that surface functional groups play a significant role in Ti3C2T2/1T‐MoS2 modification and similar strategy via chemical modification of metallic hybrids provides hints for designing high performance anode material for LIBs.

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Structural Evolution and Transition Dynamics in Lithium Ion Battery under Fast Charging: An Operando Neutron Diffraction Investigation

et al. 2021

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Fast charging (<15 min) of lithium‐ion batteries (LIBs) for electrical vehicles (EVs) is widely seen as the key factor that will greatly stimulate the EV markets, and its realization is mainly hindered by the sluggish diffusion of Li+. To have a mechanistic understanding of Li+ diffusion within LIBs, in this study, structural evolutions of electrodes for a Ni‐rich LiNi0.6Mn0.2Co0.2O2 (NMC622) || graphite cylindrical cell with high areal loading (2.78 mAh cm−2) are developed for operando neutron powder diffraction study at different charging rates. Via sequential Rietveld refinements, changes in structures of NMC622 and LixC6 are obtained during moderate and fast charging (from 0.27 C to 4.4 C). NMC622 exhibits the same structural evolution regardless of C‐rates. For phase transitions of LixC6, the stage I (LiC6) phase emerges earlier during the stepwise intercalation at a lower state of charge when charging rate is increased. It is also found that the stage II (LiC12) → stage I (LiC6) transition is the rate‐limiting step during fast charging. The LiC12 → LiC6 transition mechanism is further analyzed using the Johnson–Mehl–Avrami–Kolmogorov model. It is concluded as a diffusion‐controlled, 1D phase transition with decreasing nucleation kinetics under increasing chargingrates.

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Li-ion diffusion in Li intercalated graphite C₆Li and C₁₂Li probed by μ⁺SR

Cited by 49 publications

References 42 publications

Battery Materials Research with Muon Beam

Battery Materials Research with Muon Beam

Flatten the Li‐ion Activation in Perfectly Lattice‐Matched MXene and 1T‐MoS₂ Heterostructures via Chemical Functionalization

Structural Evolution and Transition Dynamics in Lithium Ion Battery under Fast Charging: An Operando Neutron Diffraction Investigation

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Li-ion diffusion in Li intercalated graphite C6Li and C12Li probed by μ+SR

Cited by 49 publications

References 42 publications

Battery Materials Research with Muon Beam

Battery Materials Research with Muon Beam

Flatten the Li‐ion Activation in Perfectly Lattice‐Matched MXene and 1T‐MoS2 Heterostructures via Chemical Functionalization

Structural Evolution and Transition Dynamics in Lithium Ion Battery under Fast Charging: An Operando Neutron Diffraction Investigation

Contact Info

Product

Resources

About

Li-ion diffusion in Li intercalated graphite C₆Li and C₁₂Li probed by μ⁺SR

Flatten the Li‐ion Activation in Perfectly Lattice‐Matched MXene and 1T‐MoS₂ Heterostructures via Chemical Functionalization