"Effects of Particle Size, Electronic Connectivity, and Incoherent Nanoscale Domains on the Sequence of Lithiation in LiFePO4 Porous Electrodes"

Yiyang Li: Sophie Meyer, Jongwoo Lim, Sang Chul Lee, William E. Gent, Stefano Marchesini, Harinarayan Krishnan,Tolek Tyliszczak, David Shapiro, Arthur L. David Kilcoyne, & William C. Chueh; Advanced Materials, 10/01/15.

Additional Authors: Sophie Meyer, Jongwoo Lim, Sang Chul Lee, William E. Gent, Stefano Marchesini, Harinarayan Krishnan,Tolek Tyliszczak, David Shapiro, Arthur L. David Kilcoyne, & William C. Chueh

Abstract:

High-resolution X-ray microscopy is used to investigate the sequence of lithiation in LiFePO4porous electrodes. For electrodes with homogeneous interparticle electronic connectivity via the carbon black network, the smaller particles lithiate first. For electrodes with heterogeneous connectivity, the better-connected particles preferentially lithiate. Correlative electron and X-ray microscopy also reveal the presence of incoherent nanodomains that lithiate as if they are separate particles.

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