Characterization of LiCoO2 nanoparticle suspensions by single collision events

Physical Chemistry Chemical Physics : PCCP
Simon RanoVincent Vivier

Abstract

Transient electrochemical experiments associated with the collisions between hydrothermally synthesized LiCoO2 (LCO) nanoparticles/aggregates of different sizes and a polarized gold ultramicroelectrode (UME) were used as a new additive-free analytical tool applied to Li ion insertion compounds. The size of the LCO nanoparticles/aggregates, ranging from 75 to 450 nm, the diffusion coefficient of the LCO nanoparticles/aggregates in suspension (∼8 × 10-9 cm2 s-1), and the Li ion diffusion coefficient within crystalline LCO nanoparticles (∼1.3 × 10-11 cm2 s-1) were estimated from single collision events. Interestingly, the charge exchanged during each nanoparticle collision was related to the size of the corresponding LCO aggregate, which enables electrochemical sizing distribution measurement displaying evident concordance with optical techniques, including dynamic light scattering (DLS) and cryo-transmission electron microscopy (cryo-TEM). Studying the nanoparticle collision frequency on the UME surface as a function of the LCO nanoparticle concentration allows estimation of the diffusion coefficient of LCO nanoparticles/aggregates in suspension. Finally, from the current decay observed in chronoamperometry after LCO nanoparticle...Continue Reading

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Methods Mentioned

BETA
electron exchange
transmission electronic microscopy
surface plasmon resonance microscopy
dynamic light scattering
scanning electron microscopy
X-ray

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