Imaging Methods for Quantifying Elemental Gradients in 3D for Battery Cathode Materials

Le résumé fourni par la source

Ni rich cathode particles are prone to particle cracking, and they suffer from long term cycling stability. To overcome this issue researchers have come up with the core-shell architecture where they have designed the particles with Mn rich shell and Ni rich core to gain the dual advantage of high thermal stability of Mn and longer cycling life of Ni. The cathode precursors are mixed with lithium hydroxide and calcined at higher temperature to form cathode particles. However, during calcination the transition metals tend to diffuse, and structural changes are expected in the particles with the high temperature like the release of gas and thus increase in porosity or the reduction in size of the particle. Therefore, by using two energy X-ray absorption spectroscopy (XAS) along with transmission X-ray microscopy (TXM) we have gained insights of the internal structure and concentration gradient of the secondary structures after calcination. The dual energy XAS technique before and after the K-edge of the cathode elements will give us relation on the elemental ratio and their location within the particle and the TXM will help us to visualize the particles in 3D and will give us information on the changes in the morphology of the particles after calcination.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.