English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Lithium iron phosphate (LixFePO4), a cathode material used in rechargeableLi-ion batteries, phase separates upon de/lithiation under equilibrium. Theinterfacial structure and chemistry within these cathode materials affectsLi-ion transport, and therefore battery performance. Correlative imaging ofLixFePO4 was performed using four-dimensional scanning transmission electronmicroscopy (4D-STEM), scanning transmission X-ray microscopy (STXM), and X-rayptychography in order to analyze the local structure and chemistry of the sameparticle set. Over 50,000 diffraction patterns from 10 particles providedmeasurements of both structure and chemistry at a nanoscale spatial resolution(16.6-49.5 nm) over wide (several micron) fields-of-view with statisticalrobustness.LixFePO4 particles at varying stages of delithiation were measuredto examine the evolution of structure and chemistry as a function ofdelithiation. In lithiated and delithiated particles, local variations wereobserved in the degree of lithiation even while local lattice structuresremained comparatively constant, and calculation of linear coefficients ofchemical expansion suggest pinning of the lattice structures in thesepopulations. Partially delithiated particles displayed broadly core-shell-likestructures, however, with highly variable behavior both locally and perindividual particle that exhibited distinctive intermediate regions at theinterface between phases, and pockets within the lithiated core that correspondto FePO4 in structure and chemistry.The results provide insight into theLixFePO4 system, subtleties in the scope and applicability of Vegards law(linear lattice parameter-composition behavior) under local versus globalmeasurements, and demonstrate a powerful new combination of experimental andanalytical modalities for bridging the crucial gap between local andstatistical characterization.

Correlative analysis of structure and chemistry of LixFePO4 platelets using 4D-STEM and X-ray ptychography