scholarly journals Systems-level investigation of aqueous batteries for understanding the benefit of water-in-salt electrolyte by synchrotron nanoimaging

2020 ◽  
Vol 6 (10) ◽  
pp. eaay7129 ◽  
Author(s):  
Cheng-Hung Lin ◽  
Ke Sun ◽  
Mingyuan Ge ◽  
Lisa M. Housel ◽  
Alison H. McCarthy ◽  
...  
Keyword(s):  
Environmental Sustainability ◽  
Three Dimensional ◽  
Mechanical Damage ◽  
Operating Voltage ◽  
Li Ion Batteries ◽  
X Ray ◽  
Aqueous Battery ◽  
Li Ion ◽  
X Ray Absorption ◽  
Aqueous Batteries

Water-in-salt (WIS) electrolytes provide a promising path toward aqueous battery systems with enlarged operating voltage windows for better safety and environmental sustainability. In this work, a new electrode couple, LiV3O8-LiMn2O4, for aqueous Li-ion batteries is investigated to understand the mechanism by which the WIS electrolyte improves the cycling stability at an extended voltage window. Operando synchrotron transmission x-ray microscopy on the LiMn2O4 cathode reveals that the WIS electrolyte suppresses the mechanical damage to the electrode network and dissolution of the electrode particles, in addition to delaying the water decomposition process. Because the viscosity of WIS is notably higher, the reaction heterogeneity of the electrodes is quantified with x-ray absorption spectroscopic imaging, visualizing the kinetic limitations of the WIS electrolyte. This work furthers the mechanistic understanding of electrode–WIS electrolyte interactions and paves the way to explore the strategy to mitigate their possible kinetic limitations in three-dimensional architectures.

A novel surface-sensitive X-ray absorption spectroscopic detector to study the thermal decomposition of cathode materials for Li-ion batteries

2016 ◽  
Vol 325 ◽  
pp. 79-83
Author(s):  
Takamasa Nonaka ◽  
Chikaaki Okuda ◽  
Hideaki Oka ◽  
Yusaku F. Nishimura ◽  
Yoshinari Makimura ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Cathode Materials ◽  
Li Ion Batteries ◽  
X Ray ◽  
Li Ion ◽  
X Ray Absorption

Structural complexity of layered-spinel composite electrodes for Li-ion batteries

2010 ◽  
Vol 25 (8) ◽  
pp. 1601-1616 ◽  
Author(s):  
Jordi Cabana ◽  
Christopher S. Johnson ◽  
Xiao-Qing Yang ◽  
Kyung-Yoon Chung ◽  
Won-Sub Yoon ◽  
...  
Keyword(s):  
Structural Complexity ◽  
Composite Electrodes ◽  
Li Ion Batteries ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Temperatures ◽  
Li Ion ◽  
Excess Phase ◽  
X Ray Absorption

The complexity of layered-spinel yLi2MnO3·(1 – y)Li1+xMn2–xO4 (Li:Mn = 1.2:1; 0 ≤ x ≤ 0.33; y ≥ 0.45) composites synthesized at different temperatures has been investigated by a combination of x-ray diffraction (XRD), x-ray absorption spectroscopy (XAS), and nuclear magnetic resonance (NMR). While the layered component does not change substantially between samples, an evolution of the spinel component from a high to a low lithium excess phase has been traced with temperature by comparing with data for pure Li1+xMn2–xO4. The changes that occur to the structure of the spinel component and to the average oxidation state of the manganese ions within the composite structure as lithium is electrochemically removed in a battery have been monitored using these techniques, in some cases in situ. Our 6Li NMR results constitute the first direct observation of lithium removal from Li2MnO3 and the formation of LiMnO2 upon lithium reinsertion.

Phosphorus anionic redox activity revealed by operando P K-edge X-ray absorption spectroscopy on diphosphonate-based conversion materials in Li-ion batteries

2018 ◽  
Vol 54 (39) ◽  
pp. 4939-4942 ◽  
Author(s):  
Sebastian Schmidt ◽  
Sébastien Sallard ◽  
Camelia Borca ◽  
Thomas Huthwelker ◽  
Petr Novák ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Redox Reaction ◽  
Redox Activity ◽  
Li Ion Batteries ◽  
Inorganic Hybrid ◽  
X Ray ◽  
Conversion Materials ◽  
Li Ion ◽  
Metal Redox ◽  
X Ray Absorption

When cycling diphosphonate-based organic–inorganic hybrid materials as negative battery electrodes, specific charges exceeding the maximum for a metal redox reaction are recorded.

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

Chemical bonding in amorphous Si-coated carbon nanotubes as anodes for Li ion batteries: a XANES study

RSC Advances ◽  
2014 ◽  
Vol 4 (39) ◽  
pp. 20226-20229 ◽  
Author(s):  
Jigang Zhou ◽  
Yongfeng Hu ◽  
Xiaolin Li ◽  
Chongmin Wang ◽  
Lucia Zuin
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Li Ion Batteries ◽  
X Ray ◽  
Electrochemical Cycling ◽  
Li Ion ◽  
Amorphous Si ◽  
Spectroscopy Studies ◽  
X Ray Absorption ◽  
Coated Carbon

The Si–O–C bonding and its evolution upon electrochemical cycling in a Si-coated carbon nanotube anode are unveiled by X-ray absorption spectroscopy studies.

scholarly journals On the Origin of Reversible and Irreversible Reactions in LiNixCo(1-x)/2Mn(1-x)/2O2

2021 ◽  
Author(s):  
Karin Kleiner ◽  
Claire A. Murray ◽  
Cristina Grosu ◽  
Bixian Ying ◽  
Martin Winter ◽  
...  
Keyword(s):  
Transition Metal Oxides ◽  
Redox Reactions ◽  
Bond Formation ◽  
Reversible Capacity ◽  
Redox Processes ◽  
Li Ion Batteries ◽  
Covalent Bonds ◽  
X Ray ◽  
Li Ion ◽  
X Ray Absorption

Abstract Bond formation and breakage is crucial upon energy storage in lithium transition metal oxides (LiMeO2, Me = Ni, Co, Mn), i.e., the conventional cathode materials in Li ion batteries. Near-edge x-ray absorption finestructure spectroscopy (NEXAFS) of the Me L and O K edge performed upon the first discharge of LiNixCo(1-x)/2Mn(1-x)/2O2 (x = 0.33: NCM111, x = 0.6: NCM622, x = 0.8: NCM811) in combination with charge transfer multiplet calculations provide unambiguous experimental evidence that redox reactions in NCMs proceed via a reversible oxidation of Ni associated with the formation of covalent bonds to O neighbors, and not, as widely assumed, via pure cationic or more recently discussed, pure anionic redox processes. Correlating these electronic changes with crystallographic data using operando synchrotron X-ray powder diffraction shows that the amount of ionic Ni limits the reversible capacity - at states of charge where all ionic Ni is oxidized (above 155 mAh/g), the lattice parameters collapse, and irreversible reactions are observed. Yet the covalence of the Ni-O bonds also triggers the electronic structure and thus the operation potential of the cathodes.

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