Improvement of the cyclic deterioration and structural evolution of Li[Li0.2Ni0.2Mn0.6]O2 cathode material by controlling initial charging voltages

RSC Advances ◽  
2016 ◽  
Vol 6 (28) ◽  
pp. 23677-23685 ◽  
Author(s):  
Wuwei Yan ◽  
Yongning Liu ◽  
Shaokun Chong ◽  
Yi-Fang Wu
Keyword(s):  
Phase Transformation ◽  
Cathode Material ◽  
Spinel Phase ◽  
Structural Evolution ◽  
Oxygen Release

The initial stepwise charging suppresses oxygen release and restrains the layered to spinel phase transformation.

scholarly journals Revealing the Structural Evolution and Phase Transformation of O3-Type NaNi1/3Fe1/3Mn1/3O2 Cathode Material on Sintering and Cycling Processes

2020 ◽  
Vol 3 (7) ◽  
pp. 6107-6114
Author(s):  
Yingying Xie ◽  
Han Gao ◽  
Ross Harder ◽  
Linsen Li ◽  
Jihyeon Gim ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Cathode Material ◽  
Structural Evolution

scholarly journals Three-dimensional atomic-scale observation of structural evolution of cathode material in a working all-solid-state battery

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Yue Gong ◽  
Yuyang Chen ◽  
Qinghua Zhang ◽  
Fanqi Meng ◽  
Jin-An Shi ◽  
...  
Keyword(s):  
Solid State ◽  
Cathode Material ◽  
Three Dimensional ◽  
Structural Evolution ◽  
Atomic Scale ◽  
Solid State Battery

Phase Transformation Behavior and Stability of LiNiO 2 Cathode Material for Li‐Ion Batteries Obtained from In Situ Gas Analysis and Operando X‐Ray Diffraction

ChemSusChem ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 2240-2250 ◽  
Author(s):  
Lea de Biasi ◽  
Alexander Schiele ◽  
Maria Roca‐Ayats ◽  
Grecia Garcia ◽  
Torsten Brezesinski ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Cathode Material ◽  
Gas Analysis ◽  
Li Ion Batteries ◽  
X Ray Diffraction ◽  
Transformation Behavior ◽  
X Ray ◽  
Phase Transformation Behavior ◽  
Li Ion

Optimizing the structure of layered cathode material for higher electrochemical performance by elucidating structural evolution during heat processing

Nano Energy ◽  
2020 ◽  
Vol 78 ◽  
pp. 105194 ◽  
Author(s):  
Zhongyuan Huang ◽  
Mihai Chu ◽  
Rui Wang ◽  
Weiming Zhu ◽  
Wenguang Zhao ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Cathode Material ◽  
Structural Evolution ◽  
Heat Processing

Is the olivine–spinel phase transformation martensitic?

Nature ◽  
1982 ◽  
Vol 298 (5872) ◽  
pp. 357-358 ◽  
Author(s):  
P. J. Vaughan ◽  
H. W. Green ◽  
R. S. Coe
Keyword(s):  
Phase Transformation ◽  
Spinel Phase

Defect chemical studies on oxygen release from the Li-rich cathode material Li1.2Mn0.6Ni0.2O2−δ

2019 ◽  
Vol 7 (9) ◽  
pp. 5009-5019 ◽  
Author(s):  
Takashi Nakamura ◽  
Hongze Gao ◽  
Kento Ohta ◽  
Yuta Kimura ◽  
Yusuke Tamenori ◽  
...  
Keyword(s):  
Cathode Material ◽  
Defect Chemistry ◽  
Oxygen Release ◽  
Chemical Studies

Oxygen release from a Li-rich cathode material was quantitatively evaluated and discussed based on defect chemistry and thermodynamics.

TEM and Raman spectroscopy evidence of layered to spinel phase transformation in layered LiNi1/3Mn1/3Co1/3O2 upon cycling to higher voltages

2014 ◽  
Vol 733 ◽  
pp. 6-19 ◽  
Author(s):  
Prasant Kumar Nayak ◽  
Judith Grinblat ◽  
Mikhael Levi ◽  
Yan Wu ◽  
Bob Powell ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Phase Transformation ◽  
Spinel Phase

scholarly journals Correlating the Structural Evolution of ZnO/Al2O3 to Spinel Zinc Aluminate with its Catalytic Performance in Propane Dehydrogenation

2021 ◽  
Author(s):  
Manouchehr Nadjafi ◽  
Agnieszka M. Kierzkowska ◽  
Andac Armutlulu ◽  
Rene Verel ◽  
Alexey Fedorov ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Spinel Phase ◽  
Structural Evolution ◽  
Atomic Layer ◽  
Catalytic Performance ◽  
Coke Deposition ◽  
Core Shell ◽  
Zinc Aluminate ◽  
Wurtzite Phase ◽  
X Ray

Zn-based Al<sub>2</sub>O<sub>3</sub>-suported materials have been proposed as inexpensive and environmentally friendly catalysts for the direct dehydrogenation of propane (PDH), however, our understanding of these catalysts’ structure and deactivation routes is still limited. Here, we correlate the catalytic activity for PDH of a series of Zn-based Al<sub>2</sub>O<sub>3</sub> catalysts with their structure and structural evolution. To this end, three model catalysts are investigated. (i) ZnO/Al<sub>2</sub>O<sub>3</sub> prepared by atomic layer deposition (ALD) of ZnO onto γ-Al<sub>2</sub>O<sub>3 </sub>followed by calcination at 700 °C, which yields a core-shell spinel zinc aluminate/γ-Al<sub>2</sub>O<sub>3</sub> structure. (ii) Zinc aluminate spinel nanoparticles (Zn<sub>x</sub>Al<sub>y</sub>O<sub>4</sub> NPs) prepared via a hydrothermal method. (iii) A reference core-shell ZnO/SiO<sub>2</sub> catalyst prepared by ALD of ZnO on SiO<sub>2</sub>. The catalysts are characterized in detail by synchrotron X-ray powder diffraction (XRD), Zn K-edge X-ray absorption spectroscopy (XAS), and <sup>27</sup>Al solid state nuclear magnetic resonance (ssNMR). These experiments allowed us to identify tetrahedral Zn sites in close proximity to Al sites of a zinc aluminate spinel phase (Zn<sub>IV</sub>–O–Al<sub>IV/VI</sub> linkages) as notably more active and selective in PDH relative to the supported ZnO wurtzite phase (Zn<sub>IV</sub>–O– Zn<sub>IV</sub> linkages) in ZnO/SiO<sub>2</sub>. The best performing catalyst, 50ZnO/Al<sub>2</sub>O<sub>3</sub> gives 77% selectivity to propene (gaseous products based) at 9 mmol C<sub>3</sub>H<sub>6</sub> gcat−1 h<sup>−1</sup> space time yield (STY) after 3 min of reaction at 600 °C. On the other hand, the core-shell ZnO/Al<sub>2</sub>O<sub>3</sub> catalyst shows an irreversible loss of activity over repeated PDH and air-regeneration cycles, explained by Zn depletion on the surface due to its diffusion into subsurface layers or the bulk. ZnxAlyO<sub>4</sub> NPs gave a comparable initial selectivity and catalytic activity as 50ZnO/Al<sub>2</sub>O<sub>3</sub>. With time on stream, Zn<sub>x</sub>Al<sub>y</sub>O<sub>4</sub> NPs deactivate due to the formation of coke at the catalyst surface, yet the extend of coke deposition is lower than for the ZnO/Al<sub>2</sub>O<sub>3</sub> catalysts, and the activity of Zn<sub>x</sub>Al<sub>y</sub>O<sub>4</sub> NPs can be regenerated almost fully using calcination in air.<br>

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