Topological defect dynamics in operando battery nanoparticles

Autor:	Jesse N. Clark, Hyung-Man Cho, Jong Woo Kim, Oleg Shpyrko, Ross Harder, Ying Shirley Meng, Andrej Singer, Andrew Ulvestad, J. Maser
Rok vydání:	2015
Předmět:	Battery (electricity) Multidisciplinary Materials science Nanoparticle Nanotechnology Cathode law.invention Nanomaterials Topological defect Condensed Matter::Materials Science law Phase (matter) Dislocation Nanoscopic scale
Zdroj:	Science. 348:1344-1347
ISSN:	1095-9203 0036-8075
DOI:	10.1126/science.aaa1313
Popis:	Topological defects can markedly alter nanomaterial properties. This presents opportunities for “defect engineering,” where desired functionalities are generated through defect manipulation. However, imaging defects in working devices with nanoscale resolution remains elusive. We report three-dimensional imaging of dislocation dynamics in individual battery cathode nanoparticles under operando conditions using Bragg coherent diffractive imaging. Dislocations are static at room temperature and mobile during charge transport. During the structural phase transformation, the lithium-rich phase nucleates near the dislocation and spreads inhomogeneously. The dislocation field is a local probe of elastic properties, and we find that a region of the material exhibits a negative Poisson’s ratio at high voltage. Operando dislocation imaging thus opens a powerful avenue for facilitating improvement and rational design of nanostructured materials.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::728b970b27d6ade8edff6b4c1cbdff2c https://doi.org/10.1126/science.aaa1313 Zobrazit plný text záznamu Plný text ve formátu PDF