Search

Your search keyword '"Piper, Louis F. J."' showing total 25 results
Start Over Author "Piper, Louis F. J." Journal chemistry of materials
25 results on '"Piper, Louis F. J."'

1. Electrochemical Oxidative Fluorination of an Oxide Perovskite

Author

Bashian, Nicholas H., primary, Zuba, Mateusz, additional, Irshad, Ahamed, additional, Becwar, Shona M., additional, Vinckeviciute, Julija, additional, Rahim, Warda, additional, Griffith, Kent J., additional, McClure, Eric T., additional, Papp, Joseph K., additional, McCloskey, Bryan D., additional, Scanlon, David O., additional, Chmelka, Bradley F., additional, Van der Ven, Anton, additional, Narayan, Sri R., additional, Piper, Louis F. J., additional, and Melot, Brent C., additional

Published
2021
Full Text
View/download PDF

2. Structural Phase Transitions of NbO2: Bulk versus Surface

Author

Páez Fajardo, Galo Jaime, primary, Howard, Sebastian A., additional, Evlyukhin, Egor, additional, Wahila, Matthew J., additional, Mondal, Wasim Raja, additional, Zuba, Mateusz, additional, Boschker, Jos E., additional, Paik, Hanjong, additional, Schlom, Darrell G., additional, Sadowski, Jerzy T., additional, Tenney, Samuel A., additional, Reinhart, Benjamin, additional, Lee, Wei-Cheng, additional, and Piper, Louis F. J., additional

Published
2021
Full Text
View/download PDF

3. Influence of Polymorphism on the Electronic Structure of Ga2O3

Author

Swallow, Jack E. N., primary, Vorwerk, Christian, additional, Mazzolini, Piero, additional, Vogt, Patrick, additional, Bierwagen, Oliver, additional, Karg, Alexander, additional, Eickhoff, Martin, additional, Schörmann, Jörg, additional, Wagner, Markus R., additional, Roberts, Joseph W., additional, Chalker, Paul R., additional, Smiles, Matthew J., additional, Murgatroyd, Philip, additional, Razek, Sara A., additional, Lebens-Higgins, Zachary W., additional, Piper, Louis F. J., additional, Jones, Leanne A. H., additional, Thakur, Pardeep K., additional, Lee, Tien-Lin, additional, Varley, Joel B., additional, Furthmüller, Jürgen, additional, Draxl, Claudia, additional, Veal, Tim D., additional, and Regoutz, Anna, additional

Published
2020
Full Text
View/download PDF

4. Mapping Competitive Reduction upon Charging in LiNi0.8Co0.15Al0.05O2 Primary Particles

Author

Wolfman, Mark, primary, Yu, Young-Sang, additional, May, Brian M., additional, Lebens-Higgins, Zachary W., additional, Sallis, Shawn, additional, Faenza, Nicholas V., additional, Pereira, Nathalie, additional, Shirato, Nozomi, additional, Rose, Volker, additional, Shapiro, David A., additional, Amatucci, Glenn G., additional, Piper, Louis F. J., additional, and Cabana, Jordi, additional

Published
2020
Full Text
View/download PDF

5. Influence of Polymorphism on the Electronic Structure of Ga2O3.

Author

Swallow, Jack E. N., Vorwerk, Christian, Mazzolini, Piero, Vogt, Patrick, Bierwagen, Oliver, Karg, Alexander, Eickhoff, Martin, Schörmann, Jörg, Wagner, Markus R., Roberts, Joseph W., Chalker, Paul R., Smiles, Matthew J., Murgatroyd, Philip, Razek, Sara A., Lebens-Higgins, Zachary W., Piper, Louis F. J., Jones, Leanne A. H., Thakur, Pardeep K., Lee, Tien-Lin, and Varley, Joel B.

Published
2020
Full Text
View/download PDF

8. Evolution of the Electrode–Electrolyte Interface of LiNi0.8Co0.15Al0.05O2 Electrodes Due to Electrochemical and Thermal Stress

Author

Lebens-Higgins, Zachary W., primary, Sallis, Shawn, additional, Faenza, Nicholas V., additional, Badway, Fadwa, additional, Pereira, Nathalie, additional, Halat, David M., additional, Wahila, Matthew, additional, Schlueter, Christoph, additional, Lee, Tien-Lin, additional, Yang, Wanli, additional, Grey, Clare P., additional, Amatucci, Glenn G., additional, and Piper, Louis F. J., additional

Published
2018
Full Text
View/download PDF

9. Mitigating Cation Diffusion Limitations and Intercalation-Induced Framework Transitions in a 1D Tunnel-Structured Polymorph of V2O5

Author

Horrocks, Gregory A., primary, Parija, Abhishek, additional, De Jesus, Luis R., additional, Wangoh, Linda, additional, Sallis, Shawn, additional, Luo, Yuting, additional, Andrews, Justin L., additional, Jude, Joshua, additional, Jaye, Cherno, additional, Fischer, Daniel A., additional, Prendergast, David, additional, Piper, Louis F. J., additional, and Banerjee, Sarbajit, additional

Published
2017
Full Text
View/download PDF

11. Reaction Heterogeneity in LiNi0.8Co0.15Al0.05O2Induced by Surface Layer

Author

Grenier, Antonin, Liu, Hao, Wiaderek, Kamila M., Lebens-Higgins, Zachary W., Borkiewicz, Olaf J., Piper, Louis F. J., Chupas, Peter J., and Chapman, Karena W.

Abstract

Through operando synchrotron powder X-ray diffraction (XRD) analysis of layered transition metal oxide electrodes of composition LiNi0.8Co0.15Al0.05O2(NCA), we decouple the intrinsic bulk reaction mechanism from surface-induced effects. For identically prepared and cycled electrodes stored in different environments, we demonstrate that the intrinsic bulk reaction for pristine NCA follows solid-solution mechanism, not a two-phase as suggested previously. By combining high resolution powder X-ray diffraction, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and surface sensitive X-ray photoelectron spectroscopy (XPS), we demonstrate that adventitious Li2CO3forms on the electrode particle surface during exposure to air through reaction with atmospheric CO2. This surface impedes ionic and electronic transport to the underlying electrode, with progressive erosion of this layer during cycling giving rise to different reaction states in particles with an intact versus an eroded Li2CO3surface-coating. This reaction heterogeneity, with a bimodal distribution of reaction states, has previously been interpreted as a “two-phase” reaction mechanism for NCA, as an activation step that only occurs during the first cycle. Similar surface layers may impact the reaction mechanism observed in other electrode materials using bulk probes such as operando powder XRD.

Published
2024
Full Text
View/download PDF

12. Lone-Pair Stabilization in Transparent Amorphous Tin Oxides: A Potential Route to p-Type Conduction Pathways

Author

Wahila, Matthew J., primary, Butler, Keith T., additional, Lebens-Higgins, Zachary W., additional, Hendon, Christopher H., additional, Nandur, Abhishek S., additional, Treharne, Robert E., additional, Quackenbush, Nicholas F., additional, Sallis, Shawn, additional, Mason, Katie, additional, Paik, Hanjong, additional, Schlom, Darrell G., additional, Woicik, Joseph C., additional, Guo, Jinghua, additional, Arena, Dario A., additional, White, Bruce E., additional, Watson, Graeme W., additional, Walsh, Aron, additional, and Piper, Louis F. J., additional

Published
2016
Full Text
View/download PDF

13. Electrode Reaction Mechanism of Ag2VO2PO4 Cathode

Author

Zhang, Ruibo, primary, Abtew, Tesfaye A., additional, Quackenbush, Nicholas F., additional, Wangoh, Linda W., additional, Huie, Matthew, additional, Brady, Alexander B., additional, Bock, David, additional, Efstathiadis, Harry, additional, Whittingham, M. Stanley, additional, Marschilok, Amy C., additional, Takeuchi, Kenneth J., additional, Takeuchi, Esther S., additional, Zhang, Peihong, additional, and Piper, Louis F. J., additional

Published
2016
Full Text
View/download PDF

14. Molybdenum Substituted Vanadyl Phosphate ε-VOPO4 with Enhanced Two-Electron Transfer Reversibility and Kinetics for Lithium-Ion Batteries

Author

Wen, Bohua, primary, Wang, Qi, additional, Lin, Yuhchieh, additional, Chernova, Natasha A., additional, Karki, Khim, additional, Chung, Youngmin, additional, Omenya, Fredrick, additional, Sallis, Shawn, additional, Piper, Louis F. J., additional, Ong, Shyue Ping, additional, and Whittingham, M. S., additional

Published
2016
Full Text
View/download PDF

15. Thermodynamics, Kinetics and Structural Evolution of ε-LiVOPO4 over Multiple Lithium Intercalation

Author

Lin, Yuh-Chieh, primary, Wen, Bohua, additional, Wiaderek, Kamila M., additional, Sallis, Shawn, additional, Liu, Hao, additional, Lapidus, Saul H., additional, Borkiewicz, Olaf J., additional, Quackenbush, Nicholas F., additional, Chernova, Natasha A., additional, Karki, Khim, additional, Omenya, Fredrick, additional, Chupas, Peter J., additional, Piper, Louis F. J., additional, Whittingham, M. Stanley, additional, Chapman, Karena W., additional, and Ong, Shyue Ping, additional

Published
2016
Full Text
View/download PDF

21. Surface Structural and Chemical Evolution of Layered LiNi0.8Co0.15Al0.05O2(NCA) under High Voltage and Elevated Temperature Conditions

Author

Mukherjee, Pinaki, Faenza, Nicholas V., Pereira, Nathalie, Ciston, Jim, Piper, Louis F. J., Amatucci, Glenn G., and Cosandey, Frederic

Abstract

This paper reports new insights into structural and chemical evolution of surface phases of LiNi0.8Co0.15Al0.05O2(NCA) held at constant high voltages (up to 4.75 V) as well as high temperatures (60 °C) by correlating crystal structure using high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) imaging with chemistry using electron energy loss spectroscopy (EELS). We also followed the Al distribution within individual NCA particles by X-ray energy dispersive spectroscopy (EDS). The progression of these phases as a function of distance from the edge shows simultaneous evolution of crystal structures and chemistry from rocksalt to layered, forming a complete solid solution. We have also observed an extended disordered phase with rocksalt (Fm3̅m) symmetry in which quantitative electron energy loss spectroscopy reveals it to be an oxygen deficient cation disordered phase with chemical characteristics, as determined by EELS, similar to spinel. The formation of these disordered phases with cation and oxygen vacancies has been driven by surface oxygen loss caused by reactions with the electrolyte followed by cation migration from the octahedral 3a M (M = Ni, Co, Al) layer to the octahedral 3b Li layer. These surface rocksalt phases are not fully dense as they contain Al and Li as well as a high concentration of cation and oxygen vacancies. After discharge, Li is detected within these phases indicative that Li transport has occurred through these rocksalt phases. At 60 °C and 4.75 V a very large impedance rise is observed leading to complete cell irreversibility which is caused by significant metal dissolution from the cathode and formation of surface porosity. In the near surface region of some particles, a phase transformation from R3̅m (O3) to P3̅m1 (O1) is also observed which has become thermodynamically stable from complete delithiation as well as from local Al surface depletion.

Published
2018
Full Text
View/download PDF

22. Electrode Reaction Mechanism of Ag2VO2PO4 Cathode.

Author

Ruibo Zhang, Abtew, Tesfaye A., Quackenbush, Nicholas F., Wangoh, Linda W., Huie, Matthew, Brady, Alexander B., Bock, David, Efstathiadis, Harry, Whittingham, M. Stanley, Marschilok, Amy C., Takeuchi, Kenneth J., Takeuchi, Esther S., Peihong Zhang, and Piper, Louis F. J.

Published
2016
Full Text
View/download PDF

25. Mitigating Cation Diffusion Limitations and Intercalation-Induced Framework Transitions in a 1D Tunnel-Structured Polymorph of V2O5.

Author

Horrocks, Gregory A., Parija, Abhishek, De Jesus, Luis R., Linda Wangoh, Sallis, Shawn, Yuting Luo, Andrews, Justin L., Jude, Joshua, Jaye, Cherno, Fischer, Daniel A., Prendergast, David, Piper, Louis F. J., and Banerjee, Sarbajit

Subjects
*INTERCALATION reactions, *ELECTRONIC structure, *CATIONS, *DIFFUSION kinetics, *ELECTRON transport kinetics
Abstract

The design of cathodes for intercalation batteries requires consideration of both atomistic and electronic structure to facilitate redox at specific transition metal sites along with the concomitant diffusion of cations and electrons. Cation intercalation often brings about energy dissipative phase transformations that give rise to substantial intercalation gradients as well as multiscale phase and strain inhomogeneities. The layered α-V2O5 phase is considered to be a classical intercalation host but is plagued by sluggish diffusion kinetics and a series of intercalation-induced phase transitions that require considerable lattice distortion. Here, we demonstrate that a 1D tunnel-structured ζphase polymorph of V2O5 provides a stark study in contrast and can reversibly accommodate Li-ions without a large distortion of the structural framework and with substantial mitigation of polaronic confinement. Entirely homogeneous lithiation is evidenced across multiple cathode particles (in contrast to α-V2O5 particles wherein lithiation-induced phase transformations induce phase segregation). Barriers to Li-ion as well as polaron diffusion are substantially diminished for metastable ζV2O5 in comparison to the thermodynamically stable α-V2O5 phase. The rigid tunnel framework, relatively small changes in coordination environment of intercalated Li-ions across the diffusion pathways defined by the 1D tunnels, and degeneracy of V 3d states at the bottom of the conduction band reduce electron localization that is a major impediment to charge transport in α-V2O5. The 1D ζphase thus facilitates a continuous lithiation pathway that is markedly different from the successive intercalation-induced phase transitions observed in α-V2O5. The results here illustrate the importance of electronic structure in mediating charge transport in oxide cathode materials and demonstrates that a metastable polymorph with higher energy bonding motifs that define frustrated coordination environments can serve as an attractive intercalation host. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results