Jump to main content
Jump to site search


Characterization of LiCoO2 nanoparticle suspensions by single collision events

Abstract

Transient electrochemical experiments associated with the collisions between hydrothermally synthesized LiCoO2 (LCO) nanoparticles/aggregates of different size and a polarized gold ultramicroelectrode were used as a new additive-free analytical tool applied to Li ion insertion compounds. LCO nanoparticles/aggregates size, ranging from 75 to 450 nm, diffusion coefficient of LCO nanoparticles/aggregates in suspension (~ 8×10-9 cm2s-1), as well as 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-TEM. Studying the nanoparticle collision frequency at the UME surface as a function of the LCO nanoparticle concentration allows to estimate the diffusion coefficient of LCO nanoparticles/aggregates in suspension. Finally, from the current decay observed in chronoamperometry after LCO nanoparticle collision at the polarized UME surface, which corresponds to the LCO oxidation (i.e. the Li+ deinsertion reaction), the Li ion diffusion coefficient within the host crystalline material is estimated. This is a key parameter, which controls cycle lifetime and charge rate in Li ion battery performance. This new approach thus allows a fine description of the nanoparticle properties, which includes sizing as well as estimation of the Li ion diffusion coefficient within the host crystalline material.

Back to tab navigation

Supplementary files

Publication details

The article was received on 11 Jan 2019, accepted on 12 Feb 2019 and first published on 12 Feb 2019


Article type: Paper
DOI: 10.1039/C9CP00199A
Citation: Phys. Chem. Chem. Phys., 2019, Accepted Manuscript

  •   Request permissions

    Characterization of LiCoO2 nanoparticle suspensions by single collision events

    S. Rano, C. Laberty, K. NGO, C. Sanchez-Sanchez and V. Vivier, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C9CP00199A

Search articles by author

Spotlight

Advertisements