scholarly journals X-ray Photoemission Spectroscopy Study of Cationic and Anionic Redox Processes in High-Capacity Li-Ion Battery Layered-Oxide Electrodes

2016 ◽  
Vol 120 (2) ◽  
pp. 862-874 ◽  
Author(s):  
Dominique Foix ◽  
Mariyappan Sathiya ◽  
Eric McCalla ◽  
Jean-Marie Tarascon ◽  
Danielle Gonbeau
Keyword(s):  
High Capacity ◽  
Photoemission Spectroscopy ◽  
Redox Processes ◽  
Li Ion Battery ◽  
Spectroscopy Study ◽  
X Ray ◽  
Layered Oxide ◽  
Oxide Electrodes ◽  
Li Ion

Operando X-ray Absorption Study of the Redox Processes Involved upon Cycling of the Li-Rich Layered Oxide Li1.20Mn0.54Co0.13Ni0.13O2 in Li Ion Batteries

2014 ◽  
Vol 118 (11) ◽  
pp. 5700-5709 ◽  
Author(s):  
H. Koga ◽  
L. Croguennec ◽  
M. Ménétrier ◽  
P. Mannessiez ◽  
F. Weill ◽  
...  
Keyword(s):  
Redox Processes ◽  
Li Ion Batteries ◽  
Absorption Study ◽  
X Ray ◽  
Layered Oxide ◽  
Li Ion ◽  
X Ray Absorption

scholarly journals In situ Fe K-edge X-ray absorption spectroscopy study during cycling of Li2FeSiO4 and Li2.2Fe0.9SiO4 Li ion battery materials

2015 ◽  
Vol 3 (14) ◽  
pp. 7314-7322 ◽  
Author(s):  
Alexander W. Brownrigg ◽  
Gavin Mountjoy ◽  
Alan V. Chadwick ◽  
Maria Alfredsson ◽  
Wim Bras ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Li Ion Battery ◽  
Spectroscopy Study ◽  
Battery Materials ◽  
X Ray ◽  
Local Structures ◽  
Li Ion ◽  
X Ray Absorption

The valence and local structures of Fe during battery cycling of Li2FeSiO4 and Li2.2Fe0.9SiO4 are studied by in situ (XAS) measurements.

Carbon-coated α-Fe2O3 nanostructures for efficient anode of Li-ion battery

2015 ◽  
Vol 3 (9) ◽  
pp. 5183-5188 ◽  
Author(s):  
Xiaoxin Lv ◽  
Jiujun Deng ◽  
Jian Wang ◽  
Jun Zhong ◽  
Xuhui Sun
Keyword(s):  
High Capacity ◽  
Li Ion Battery ◽  
X Ray ◽  
Scanning Transmission ◽  
Carbon Coated ◽  
Li Ion

Carbon-coated hematite nanostructures were prepared for Li-ion battery with high capacity, and the mechanism was probed by scanning transmission X-ray microscopy.

scholarly journals Analysis of nanostructured cobalt ion beam-modified Ge surface for high capacity Li-ion battery anodes by X-ray photoelectron spectroscopy

2020 ◽  
Vol 1588 ◽  
pp. 012024
Author(s):  
N M Lyadov ◽  
S M Khantimerov ◽  
I V Yanilkin ◽  
I A Faizrakhmanov ◽  
V V Bazarov ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Ion Beam ◽  
High Capacity ◽  
Li Ion Battery ◽  
Cobalt Ion ◽  
X Ray ◽  
Li Ion

Anionic and Cationic Redox Processes in β-Li2IrO3 and Their Structural Implications on Electrochemical Cycling in Li-Ion Cell

2019 ◽  
Author(s):  
Paul Pearce ◽  
Gaurav Assat ◽  
Antonella Iadecola ◽  
François Fauth ◽  
Rémi Dedryvère ◽  
...  
Keyword(s):  
Analytical Techniques ◽  
Charge Compensation ◽  
Coupling Mechanism ◽  
Redox Processes ◽  
Positive Electrodes ◽  
X Ray ◽  
Electrochemical Cycling ◽  
Li Ion ◽  
Electrochemical Instability ◽  
High Degree

The recent discovery of anionic redox as a means to increase the energy density of transition metal oxide positive electrodes is now a well established approach in the Li-ion battery field. However, the science behind this new phenomenon pertaining to various Li-rich materials is still debated. Thus, it is of paramount importance to develop a robust set of analytical techniques to address this issue. Herein, we use a suite of synchrotron-based X-ray spectroscopies as well as diffraction techniques to thoroughly characterize the different redox processes taking place in a model Li-rich compound, the tridimentional hyperhoneycomb β-Li2IrO3. We clearly establish that the reversible removal of Li+ from this compound is associated to a previously described reductive coupling mechanism and the formation of the M-(O-O) and M-(O-O)* states. We further show that the respective contributions to these states determine the spectroscopic response for both Ir L3-edge X-ray absorption spectroscopy (XAS) and X-ray photoemissions spectroscopy (XPS). Although the high covalency and the robust tridimentional structure of this compound enable a high degree of reversibile delithiation, we found that pushing the limits of this charge compensation mechanism has significant effects on the local as well as average structure, leading to electrochemical instability over cycling and voltage decay. Overall, this work highlights the practical limits to which anionic redox can be exploited and sheds some light on the nature of the oxidized species formed in certain lithium-rich compounds.<br>

Anionic and Cationic Redox Processes in β-Li2IrO3 and Their Structural Implications on Electrochemical Cycling in Li-Ion Cell

2019 ◽  
Author(s):  
Paul Pearce ◽  
Gaurav Assat ◽  
Antonella Iadecola ◽  
François Fauth ◽  
Rémi Dedryvère ◽  
...  
Keyword(s):  
Analytical Techniques ◽  
Charge Compensation ◽  
Coupling Mechanism ◽  
Redox Processes ◽  
Positive Electrodes ◽  
X Ray ◽  
Electrochemical Cycling ◽  
Li Ion ◽  
Electrochemical Instability ◽  
High Degree

The recent discovery of anionic redox as a means to increase the energy density of transition metal oxide positive electrodes is now a well established approach in the Li-ion battery field. However, the science behind this new phenomenon pertaining to various Li-rich materials is still debated. Thus, it is of paramount importance to develop a robust set of analytical techniques to address this issue. Herein, we use a suite of synchrotron-based X-ray spectroscopies as well as diffraction techniques to thoroughly characterize the different redox processes taking place in a model Li-rich compound, the tridimentional hyperhoneycomb β-Li2IrO3. We clearly establish that the reversible removal of Li+ from this compound is associated to a previously described reductive coupling mechanism and the formation of the M-(O-O) and M-(O-O)* states. We further show that the respective contributions to these states determine the spectroscopic response for both Ir L3-edge X-ray absorption spectroscopy (XAS) and X-ray photoemissions spectroscopy (XPS). Although the high covalency and the robust tridimentional structure of this compound enable a high degree of reversibile delithiation, we found that pushing the limits of this charge compensation mechanism has significant effects on the local as well as average structure, leading to electrochemical instability over cycling and voltage decay. Overall, this work highlights the practical limits to which anionic redox can be exploited and sheds some light on the nature of the oxidized species formed in certain lithium-rich compounds.<br>

Enhancing Co/Co2VO4 Li-ion Battery Anode Performances via 2D-2D Heterostructure Engineering

Nanoscale ◽  
2021 ◽  
Author(s):  
Kun Wang ◽  
Yongyuan Hu ◽  
Jian Pei ◽  
Fengyang Jing ◽  
Zhongzheng Qin ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Output Voltage ◽  
High Capacity ◽  
Lithium Ion ◽  
Li Ion Battery ◽  
Li Ion ◽  
Battery Anode

High capacity Co2VO4 becomes a potential anode material for lithium ion batteries (LIBs) benefiting from its lower output voltage during cycling than other cobalt vanadates. However, the application of this...

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