Improving the cycling stability of high voltage LNMO by tailoring structure and composition

Improving the cycling stability of high voltage LNMO by…

Presenter: Dr. Christian Elkjær
Title: Towards Automatic Disassembly of EV-Batteries
Affiliation: Haldor Topsoe A/S

Abstract

Li1Ni0.5Mn1.5O4 is a promising cobalt free cathode material that offers high energy density at a competitive price. Due to the high operating voltage of 4.7 V vs. Li/Li+, LNMO based batteries however suffers from limited lifetime due to instabilities of the various components in the cell. At Haldor Topsøe we develop LNMO and have focused much of our research in the detailed understanding of the structure and chemistry of the cathode material by using our existing facilities for microstructural characterization of catalyst materials by e.g. XRD and electron microscopy. In this presentation, we will show how the size of the spinel lattice is closely correlated with the amount of Mn3+ in the structure as measured electrochemically and how this is related to the composition of the LNMO as measured by electron microscopy. Further, these parameters have a profound influence on the integrity of the cathode material, and thereby the cycling stability, in half-cells.

Full conference program

Christian Fink Elkjær
Christian Fink Elkjær
Christian Fink Elkjær is part of the team developing the LNMO battery material at Haldor Topsoe. He has been working with electron microscopy at Haldor Topsoe and the Technical University of Denmark for the past 8 years. Among others, he has contributed greatly within the development of a nano reactor that enable in situ TEM of catalysysts operated at a gas pressure of up to 1 bar. In the past two years, Christian has been part of the battery team at Haldor Topsoe to increase fundamental understanding of battery material synthesis and degradation.