scholarly journals Phase evolution and structural modulation during in situ lithiation of MoS2, WS2 and graphite in TEM

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chanchal Ghosh ◽  
Manish Kumar Singh ◽  
Shayani Parida ◽  
Matthew T. Janish ◽  
Arthur Dobley ◽  
...  
Keyword(s):  
Electrode Materials ◽  
Phase Evolution ◽  
Host Matrix ◽  
Electron Detection ◽  
Structural Modulation ◽  
Chemical Segregation ◽  
Li Ion ◽  
Solid State Interaction ◽  
Oswald Ripening

AbstractLi-ion batteries function by Li intercalating into and through the layered electrode materials. Intercalation is a solid-state interaction resulting in the formation of new phases. The new observations presented here reveal that at the nanoscale the intercalation mechanism is fundamentally different from the existing models and is actually driven by nonuniform phase distributions rather than the localized Li concentration: the lithiation process is a ‘distribution-dependent’ phenomena. Direct structure imaging of 2H and 1T dual-phase microstructures in lithiated MoS2 and WS2 along with the localized chemical segregation has been demonstrated in the current study. Li, a perennial challenge for the TEM, is detected and imaged using a low-dose, direct-electron detection camera on an aberration-corrected TEM and confirmed by image simulation. This study shows the presence of fully lithiated nanoscale domains of 2D host matrix in the vicinity of Li-lean regions. This confirms the nanoscale phase formation followed by Oswald ripening, where the less-stable smaller domains dissolves at the expense of the larger and more stable phases.

In Situ XRD Study of the Phase Evolution in LixMn1.5Ni0.5O4 as 4.7-Volt Positive Electrode Materials for Li-Ion Batteries

2014 ◽  
Vol 58 (14) ◽  
pp. 35-40
Author(s):  
W. Zhu ◽  
D. Liu ◽  
J. Trottier ◽  
P. Hovington ◽  
C. Gagnon ◽  
...  
Keyword(s):  
Electrode Materials ◽  
Phase Evolution ◽  
Positive Electrode ◽  
Li Ion Batteries ◽  
In Situ Xrd ◽  
Xrd Study ◽  
Li Ion ◽  
Positive Electrode Materials

Real-time monitoring of stress development during electrochemical cycling of electrode materials for Li-ion batteries: overview and perspectives

2019 ◽  
Vol 7 (41) ◽  
pp. 23679-23726 ◽  
Author(s):  
Manoj K. Jangid ◽  
Amartya Mukhopadhyay
Keyword(s):  
Real Time ◽  
Electrode Materials ◽  
Electrochemical Potential ◽  
Li Ion Batteries ◽  
Stress Development ◽  
Electrochemical Cycling ◽  
Li Ion ◽  
Real Time Information ◽  
Time Information

Monitoring stress development in electrodes in-situ provides a host of real-time information on electro-chemo-mechanical aspects as functions of SOC and electrochemical potential.

A neutron diffraction cell for studying lithium-insertion processes in electrode materials

1998 ◽  
Vol 31 (5) ◽  
pp. 823-825 ◽  
Author(s):  
Ö. Bergstöm ◽  
A. M. Andersson ◽  
K. Edström ◽  
T. Gustafsson
Keyword(s):  
Neutron Diffraction ◽  
Electrode Materials ◽  
Negative Electrode ◽  
Current Collector ◽  
Neutron Diffraction Study ◽  
Lithium Insertion ◽  
Lithium Electrode ◽  
Extraction Processes ◽  
Li Ion

An electrochemical cell has been constructed forin situneutron diffraction studies of lithium-insertion/extraction processes in electrode materials for Li-ion batteries. Its key components are a Pyrex tube, gold plated on its inside, which functions as a current collector, and a central lithium rod, which serves as the negative electrode. The device is demonstrated here for a neutron diffraction study of lithium extraction from LiMn2O4: a mechanical Celgard©separator soaked in the electrolyte surrounds the lithium electrode. The LiMn2O4powder, mixed with electrolyte, occupies the space between separator and current collector.

scholarly journals In situ SEM study of lithium intercalation in individual V2O5 nanowires

Nanoscale ◽  
2015 ◽  
Vol 7 (7) ◽  
pp. 3022-3027 ◽  
Author(s):  
Evgheni Strelcov ◽  
Joshua Cothren ◽  
Donovan Leonard ◽  
Albina Y. Borisevich ◽  
Andrei Kolmakov
Keyword(s):  
Electrode Materials ◽  
Lithium Intercalation ◽  
Li Ion Batteries ◽  
Length Scales ◽  
Rational Engineering ◽  
Electrochemical Processes ◽  
Multiple Length Scales ◽  
Sem Study ◽  
Li Ion

Progress in rational engineering of Li-ion batteries requires better understanding of the electrochemical processes and accompanying transformations in the electrode materials on multiple length scales.

scholarly journals Synthetic Pathway Determines the Non-equilibrium Crystallography of Li- and Mn-rich Layered Oxides

2020 ◽  
Author(s):  
Ashok S. Menon ◽  
Seda Ulusoy ◽  
Dickson Ojwang ◽  
Lars Riekehr ◽  
Christophe Didier ◽  
...  
Keyword(s):  
Electrode Materials ◽  
Sol Gel ◽  
Direct Consequence ◽  
Layered Oxides ◽  
High Performing ◽  
In Situ Methods ◽  
Li Ion ◽  
Complementary Techniques ◽  
Multi Phase

Li- and Mn-rich layered oxides show significant promise as electrode materials for future Li-ion batteries. However, accurate descriptions of its crystallography remain elusive, with both single-phase solid solution and multi-phase structures being proposed for high performing materials such as Li<sub>1.2</sub>Mn<sub>0.54</sub>Ni<sub>0.13</sub>Co<sub>0.13</sub>O<sub>2</sub>. Herein, we report the synthesis of single- and multi-phase variants of this material through sol-gel and solid-state methods, respectively, and conclusively demonstrate that its crystallography is a direct consequence of the synthetic route and not an inherent property of the composition, as previously argued. This was accomplished via complementary techniques that probe the bulk and local structure followed by in situ methods to map the synthetic progression. As the electrochemical performance and anionic redox behaviour is often rationalised on the basis of the presumed crystal structure, clarifying the structural ambiguities is an important step towards harnessing its potential as an electrode material.

scholarly journals Layered metal–organic framework based on tetracyanonickelate as a cathode material for in situ Li-ion storage

RSC Advances ◽  
2019 ◽  
Vol 9 (37) ◽  
pp. 21363-21370 ◽  
Author(s):  
Kaiqiang Zhang ◽  
Tae Hyung Lee ◽  
Bailey Bubach ◽  
Mehdi Ostadhassan ◽  
Ho Won Jang ◽  
...  
Keyword(s):  
Cathode Material ◽  
Prussian Blue ◽  
Electrode Materials ◽  
Metal Organic Framework ◽  
Ion Storage ◽  
Metal Organic ◽  
Li Ion ◽  
Prussian Blue Analogs ◽  
Organic Framework

Prussian blue analogs (PBAs) with tetracyanide linkers have been studied as electrode materials for Li-ion storage.

In situelectrochemical synchrotron radiation for Li-ion batteries

2018 ◽  
Vol 25 (1) ◽  
pp. 151-165 ◽  
Author(s):  
Tibebu Alemu ◽  
Fu-Ming Wang
Keyword(s):  
Synchrotron Radiation ◽  
Electrode Materials ◽  
Electrochemical Techniques ◽  
Phase Changes ◽  
Li Ion Batteries ◽  
Essential Information ◽  
X Ray ◽  
Intercalation Process ◽  
Li Ion

Observing the electronic structure, compositional change and morphological evolution of the surface and interface of a battery during operation provides essential information for developing new electrode materials for Li-ion batteries (LIBs); this is because such observations demonstrate the fundamental reactions occurring inside the electrode materials. Moreover, obtaining detailed data on chemical phase changes and distributions by analyzing an operating LIB is the most effective method for exploring the intercalation/de-intercalation process, kinetics and the relationship between phase change or phase distribution and battery performance, as well as for further optimizing the material synthesis routes for advanced battery materials. However, most conventionalin situelectrochemical techniques (other than by using synchrotron radiation) cannot clearly or precisely demonstrate structural change, electron valence change and chemical mapping information.In situelectrochemical-synchrotron radiation techniques such as X-ray absorption spectroscopy, X-ray diffraction spectroscopy and transmission X-ray microscopy can deliver accurate information regarding LIBs. This paper reviews studies regarding various applications ofin situelectrochemical-synchrotron radiation such as crystallographic transformation, oxidation-state changes, characterization of the solid electrolyte interphase and Li-dendrite growth mechanism during the intercalation/de-intercalation process. The paper also presents the findings of previous review articles and the future direction of these methods.

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