i am working layered oxide cathode materials for lithium ion batteries
diffusion coefficient of cathode materials[(LiNi1/3Co1/3Mn1/3)O2] finding from cyclic voltammetry and electrochemical impedance spectroscopy the value changes from four order. could anyone can you give explanation.
Lithium rich layered oxide cathode materials [Li1.2Ni0.13co0.13Mn0.54]O2 materials diffusion coefficient can be find only electrochemical impedance spectroscopy or GITT? why not cyclic voltammetry?
what is the reason these magnitude changes from experiment to one another?
electrochemical impedance for lithium rich layered oxide at different voltage can be done on the given constant frequency range (100KHZ to 10mHZ), from that we can able find the diffusion coefficient different SOC?
Thank you artur braun . if i can do impedance at different cutoff voltage of first cycle charge-discharge, so that can i get the diffusion coefficient values would be same.
which method would be more validated for Lithium rich layered oxide.where the two phase kinetics involved for lithium diffusion.
i would seen many paper for lithium rich layered oxide can be found from GITT only.
HI Shanmugam
The reaction of lithium intercalation and deintercalation is not completely reversible( like solution state reactions) Probably you may see different CV features with cycle number, means nature of reaction (may be the rate of diffusion) may with the time change. I believe that you might have calculated the diffusion co efficient from CV by using Randles−Sevcik equation. Where as EIS can be applicable only when you have an infinite diffusive layer, which is not the case in Li ion battery, hence this value is not reliable and different for the value you got from CV.
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