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STXM images of the lithium distribution in Li STXM images of the lithium distribution in Li

STXM images of the lithium distribution in Li - PowerPoint Presentation

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Uploaded On 2020-01-21

STXM images of the lithium distribution in Li - PPT Presentation

STXM images of the lithium distribution in Li x FePO 4 particles at different electrolyte exposures The lithium goes from being evenly distributed a solid solution to separate phases within particles to a mosaic of lithiumrich and lithiumpoor particles ID: 773433

particles lithium ions stxm lithium particles stxm ions national laboratory lim als research beamline batteries energy ray flow unexpectedly

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STXM images of the lithium distribution in LixFePO4 particles at different electrolyte exposures. The lithium goes from being evenly distributed (a “solid solution”), to separate phases within particles, to a “mosaic” of lithium-rich and lithium-poor particles. Scientific AchievementExperiments revealed that lithium ions unexpectedly flow along the surfaces of electrode particles, boosting the growth of lithium “hot spots” that shorten battery life. Significance and ImpactThe results correct decades’ worth of assumptions and will help improve battery design, potentially leading to a new generation of lithium-ion batteries. Publication about this research: Y. Li, H. Chen, K. Lim, H.D. Deng, J. Lim, D. Fraggedakis, P.M. Attia, S.C. Lee, N. Jin, J. Moškon, Z. Guan, W.E. Gent, J. Hong, Y.-S. Yu, M. Gaberšček, M.S. Islam, M.Z. Bazant, and W.C. Chueh, Nat. Mater. 17, 915 (2018). Work was performed at Lawrence Berkeley National Laboratory, ALS Beamline 5.3.2.2, and SLAC National Accelerator Laboratory, SSRL Beamline 2-1. Operation of the ALS is supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences program. Flow of Lithium Ions Points Way to Better Batteries Research Details Scanning transmission x-ray microscopy (STXM) was used to map Li + concentration in Li x FePO 4 particles exposed to liquid electrolyte for various lengths of time. STXM, x-ray diffraction, and computer simulations showed that Li + unexpectedly flows along material surface, promoting the creation of Li-rich and Li-poor phases.