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Andrew Ulvestad
Researcher at Argonne National Laboratory
Publications - 45
Citations - 1914
Andrew Ulvestad is an academic researcher from Argonne National Laboratory. The author has contributed to research in topics: Nanoparticle & Phase (matter). The author has an hindex of 21, co-authored 45 publications receiving 1524 citations. Previous affiliations of Andrew Ulvestad include University of California, San Diego & University of Chicago.
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Journal ArticleDOI
Topological defect dynamics in operando battery nanoparticles
Andrew Ulvestad,Andrej Singer,Jesse N. Clark,Hyung-Man Cho,Jong Woo Kim,Ross Harder,J. Maser,Ying Shirley Meng,Oleg Shpyrko +8 more
TL;DR: Three-dimensional imaging of dislocation dynamics in individual battery cathode nanoparticles under operando conditions using Bragg coherent diffractive imaging opens a powerful avenue for facilitating improvement and rational design of nanostructured materials.
Journal ArticleDOI
Nucleation of dislocations and their dynamics in layered oxide cathode materials during battery charging
Andrej Singer,Andrej Singer,Minghao Zhang,Sunny Hy,Devin Cela,Chengcheng Fang,Thomas A. Wynn,Bao Qiu,Y. Xia,Zhaoping Liu,Andrew Ulvestad,Nelson Hua,James Wingert,Haodong Liu,Michael Sprung,Alexey Zozulya,Alexey Zozulya,Evan Maxey,Ross Harder,Ying Shirley Meng,Oleg Shpyrko +20 more
TL;DR: In this paper, the authors reveal the link between voltage fade and nucleation of a mobile dislocation network in the oxide nanoparticles, offering design ideas to restore the voltage in the battery.
Journal ArticleDOI
Nucleation of dislocations and their dynamics in layered oxides cathode materials during battery charging
Andrej Singer,Sunny Hy,Minghao Zhang,Devin Cela,Chengcheng Fang,Bao Qiu,Y. Xia,Zhen Liu,Andrew Ulvestad,Nelson Hua,James Wingert,Haodong Liu,Michael Sprung,Alexey Zozulya,Evan Maxey,Ross Harder,Ying Shirley Meng,Oleg Shpyrko +17 more
TL;DR: In this paper, the authors observed nucleation of a mobile dislocation network in nanoparticles of lithium-rich layered oxide material and found that dislocations form more readily in the lithium-based layered oxide materials as compared with a conventional layered oxides.
Journal ArticleDOI
Bragg coherent diffractive imaging of single-grain defect dynamics in polycrystalline films
TL;DR: GBCDI resolves grain boundary and dislocation dynamics in individual grains in three-dimensional detail with 10-nanometer spatial and subangstrom displacement field resolution, paving the way for understanding polycrystalline material response under external stimuli and, ideally, engineering particular functions.
Journal ArticleDOI
Single Particle Nanomechanics in Operando Batteries via Lensless Strain Mapping
Andrew Ulvestad,Andrej Singer,Hyung-Man Cho,Jesse N. Clark,Ross Harder,Jörg Maser,Ying Shirley Meng,Oleg Shpyrko +7 more
TL;DR: Three-dimensional strain evolution in situ of a single LiNi0.5Mn1.5O4 nanoparticle in a coin cell battery under operando conditions during charge/discharge cycles with coherent X-ray diffractive imaging is revealed, revealing hysteresis at the single particle level.