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N4.07 - Single Nanoparticle Strain Mapping of Lithium Intercalation Compounds by In-Situ Coherent X-Ray Diffractive Imaging 
April 23, 2014   10:15am - 10:30am

Coherent x-ray diffractive imaging (CXDI), a lensless form of microscopy capable of discerning electron density and strain with 20 nm resolution, is used to map the strain evolution of a single LiNi1/2Mn3/2O4 high voltage spinel cathode particle in a functional battery as it is cycled in-situ. The evolution of compressive/tensile strain reveals a number of interesting effects. For instance, a strain front nucleates and propagates inward/outward during discharge/charge. Strain negatively correlates with Lithium amount in the first cycle, eventually becoming uncorrelated upon longterm cycling. The particle develops alternating stripes of compressive/tensile strain, perpendicular to the 111 direction, that suggests self organizing behavior. A number of other effects are explored. We demonstrate that CXDI is a powerful diagnostic tool to reveal correlation between strain and electrochemistry at the single particle level and offers valuable information for electrode/battery modeling and future battery design.

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Keynote Address
Panel Discussion - Different Approaches to Commercializing Materials Research
Business Challenges to Starting a Materials-Based Company
Fred Kavli Distinguished Lectureship in Nanoscience
Application of In-situ X-ray Absorption, Emission and Powder Diffraction Studies in Nanomaterials Research - From the Design of an In-situ Experiment to Data Analysis