scholarly journals 4D Bragg Edge Tomography of Directional Ice Templated Graphite Electrodes

2020 ◽  
Vol 6 (12) ◽  
pp. 136
Author(s):  
Ralf F. Ziesche ◽  
Anton S. Tremsin ◽  
Chun Huang ◽  
Chun Tan ◽  
Patrick S. Grant ◽  
...  
Keyword(s):  
Li Ion Battery ◽  
Graphite Electrodes ◽  
Neutron Spallation Source ◽  
Spallation Source ◽  
Li Ion ◽  
Tomography Method ◽  
First Time ◽  
Pulsed Neutron ◽  
Tomography Data ◽  
Insight Into

Bragg edge tomography was carried out on novel, ultra-thick, directional ice templated graphite electrodes for Li-ion battery cells to visualise the distribution of graphite and stable lithiation phases, namely LiC12 and LiC6. The four-dimensional Bragg edge, wavelength-resolved neutron tomography technique allowed the investigation of the crystallographic lithiation states and comparison with the electrode state of charge. The tomographic imaging technique provided insight into the crystallographic changes during de-/lithiation over the electrode thickness by mapping the attenuation curves and Bragg edge parameters with a spatial resolution of approximately 300 µm. This feasibility study was performed on the IMAT beamline at the ISIS pulsed neutron spallation source, UK, and was the first time the 4D Bragg edge tomography method was applied to Li-ion battery electrodes. The utility of the technique was further enhanced by correlation with corresponding X-ray tomography data obtained at the Diamond Light Source, UK.

Carbon-coated TiNb2O7 nanosheet arrays as self-supported high mass-loading anode for flexible Li-ion battery

2021 ◽  
Author(s):  
Jinquan Zhou ◽  
Haoyang Dong ◽  
Yao Chen ◽  
yihua Ye ◽  
Liang Xiao ◽  
...  
Keyword(s):  
Diffusion Length ◽  
High Mass ◽  
Carbon Cloth ◽  
Mass Loading ◽  
Solvothermal Process ◽  
Li Ion Battery ◽  
Nanosheet Arrays ◽  
Carbon Coated ◽  
Li Ion ◽  
First Time

TiNb2O7 anode constructed with carbon-coated nanosheet arrays on carbon cloth is prepared by a facile solvothermal process and post carbon-coating for the first time. With nanosized diffusion-length and reduced polarization...

SPINEL Li2MTi3O8(M = Mg, Mg0.5Zn0.5) NANOWIRES WITH ENHANCED ELECTROCHEMICAL LITHIUM STORAGE

2011 ◽  
Vol 04 (01) ◽  
pp. 65-69 ◽  
Author(s):  
ZHENSHENG HONG ◽  
TONGBIN LAN ◽  
YONGZAN ZHENG ◽  
LILONG JIANG ◽  
MINGDENG WEI
Keyword(s):  
Solid State ◽  
Anode Materials ◽  
Electrochemical Impedance ◽  
Impedance Spectra ◽  
Li Ion Battery ◽  
Lithium Storage ◽  
Electrochemical Impedance Spectra ◽  
Titanate Nanowires ◽  
Li Ion ◽  
First Time

Spinel structural Li2MTi3O8 ( M = Mg, Mg0.5Zn0.5 ) nanowires have been successfully synthesized using titanate nanowires as a precursor and then have been used for the first time as anode materials in a rechargeable Li -ion battery. The cell composed of Li2MgTi3O8 nanowires exhibited a discharge capacity of 232 mAhg-1 at the second cycle, while only 159 mAhg-1 was obtained for the bulk prepared by a solid state reaction. The results of electrochemical impedance spectra indicate that spinel structural Li2MTi3O8 ( M = Mg, Mg0.5Zn0.5 ) nanowires can significantly reduce the charge transfer impedance, leading to enhanced capability of electrochemical lithium storage.

Electrochemically scalable production of bilayer fluorographene nanosheets for solid-state supercapacitors

2019 ◽  
Vol 7 (28) ◽  
pp. 16876-16882 ◽  
Author(s):  
Jiangquan Lv ◽  
Peng Zeng ◽  
Syed Comail Abbas ◽  
Xiangfeng Guan ◽  
Peihui Luo ◽  
...  
Keyword(s):  
Solid State ◽  
Li Ion Battery ◽  
Electrochemical Approach ◽  
Li Ion ◽  
First Time ◽  
Scalable Production

We propose a scalable electrochemical approach to exfoliate FGi into bilayer FG nanosheets for the first time using a designed Li-ion battery.

Defects and Charging Processes in Li-Ion Battery Cathodes Studied by Operando Magnetometry and Positron Annihilation

2016 ◽  
Vol 879 ◽  
pp. 2125-2130
Author(s):  
Roland Würschum ◽  
Stefan Topolovec ◽  
Gregor Klinser ◽  
Wolfgang Sprengel ◽  
Harald Kren ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Positron Beam ◽  
Electronic Correlation ◽  
Li Ion Battery ◽  
Correlation Effects ◽  
Electronic Density ◽  
Li Ion ◽  
Set Up ◽  
First Time ◽  
Electronic Correlation Effects

A brief report is given on recent studies of the atomistic processes during charging of battery cathode material LixCoO2 by means of magnetometry and positron annihilation. A set-up for operando magnetometry is implemented which, for the first time, allowed to continuously monitor the distinct variation of the magnetic susceptibility χ of LixCoO2 which occurs during consecutive charging and discharging cycles. The variation of χ with Li+ content in the concentration range 1>x≥0.77 arises from a variation of the electronic density of states and from electronic correlation effects. The χ (x)-behaviour for x<0.77 shows that oxygen is involved in the charging process. Positron annihilation reveals vacancy-type defects on the Li-sublattice, the size of which increases with Li-extraction. Indication for Li-reordering at the reversibility limit of Li extraction is found which correlates with χ (x)-variations in this concentration regime. First measurements on LixCoO2 thin-films performed at the positron beam line NEPOMUC of FRM II at the Heinz Maier-Leibnitz neutron source will be presented.

Layered Sb2Te3 and its nanocomposite: a new and outstanding electrode material for superior rechargeable Li-ion batteries

2016 ◽  
Vol 4 (22) ◽  
pp. 8562-8565 ◽  
Author(s):  
Ki-Hun Nam ◽  
Cheol-Min Park
Keyword(s):  
Solid State ◽  
Electrode Material ◽  
Anode Materials ◽  
Li Ion Batteries ◽  
Li Ion Battery ◽  
Synthetic Route ◽  
Li Ion ◽  
First Time ◽  
Battery Anode

Here, we report, for the first time, the preparation of Sb2Te3 and the Sb2Te3/C nanocomposite by a simple solid-state synthetic route and their application as Li-ion battery anode materials.

scholarly journals Detection of Binder Gradients Using Impedance Spectroscopy and Their Influence on the Tortuosity of Li-Ion Battery Graphite Electrodes

2018 ◽  
Vol 165 (14) ◽  
pp. A3459-A3467 ◽  
Author(s):  
Robert Morasch ◽  
Johannes Landesfeind ◽  
Bharatkumar Suthar ◽  
Hubert A. Gasteiger
Keyword(s):  
Impedance Spectroscopy ◽  
Li Ion Battery ◽  
Graphite Electrodes ◽  
Li Ion

High-temperature phases of NaNbO3 and NaTaO3

1999 ◽  
Vol 55 (1) ◽  
pp. 24-30 ◽  
Author(s):  
C. N. W. Darlington ◽  
K. S. Knight
Keyword(s):  
High Temperature ◽  
Structural Changes ◽  
Single Phase ◽  
Phenomenological Theory ◽  
Single Temperature ◽  
Neutron Spallation Source ◽  
Structure Determinations ◽  
Spallation Source ◽  
Diffraction Patterns ◽  
First Time

The high-temperature phases of the perovskites sodium niobate, NaNbO3, and sodium tantalate, NaTaO3, have been re-examined using the high-resolution powder diffractometer HRPD at the ISIS neutron spallation source; the two materials show the same sequence of phases with tilted octahedra. Diffraction patterns were measured every 5 K allowing structural changes with temperature within a single phase to be determined for the first time. Previous structure determinations within one phase had been performed at a single temperature only. The octahedra are tilted about pseudocubic \langle100\rangle directions and are also deformed; the magnitude of the deformation is shown to be proportional to the square of the angle of tilt as expected from a phenomenological theory applied to such transitions. The structures of NaNbO3 between 753 and 793 K and of NaTaO3 below 758 K are not as reported in the literature.

scholarly journals Multiple diffusion pathways in LixNi0.77Co0.14Al0.09O2 (NCA) Li-ion battery cathodes

2020 ◽  
Vol 8 (23) ◽  
pp. 11545-11552
Author(s):  
Thomas E. Ashton ◽  
Peter J. Baker ◽  
Dustin Bauer ◽  
Alexandra R. Groves ◽  
Carlos Sotelo-Vazquez ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Lithium Ion Battery ◽  
Spin Relaxation ◽  
Muon Spin ◽  
Tetrahedral Site ◽  
Lithium Ion ◽  
Muon Spin Relaxation ◽  
Li Ion Battery ◽  
Li Ion ◽  
First Time

Experimental evidence for the presence of two diffusion pathways, namely the oxygen dumbbell hop (ODH) and tetrahedral site hop (TSH), has been given for the first time by muon spin relaxation (µSR) in layered oxide lithium ion battery cathodes.

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