Novel Studies of the Electrochemical Li-Cells Comprising High-Energy Li[Ni-Co-Mn]O2 Electrodes

Hadar Sclar, Chemistry, Bar Ilan University, Ramat Gan, Isreal
Chandan Ghanty, Chemistry, Bar Ilan University, Ramat Gan, Isreal
Onit Srur-Lavi, Chemistry, Bar Ilan University, Ramat Gan, Isreal
Evan Erickson, Chemistry, Bar Ilan University, Ramat Gan, Isreal
Ortal Haik, Chemistry, Bar Ilan University, Ramat Gan, Isreal
Judith Grinblat, Institute of Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan, Isreal
Michael Talianker, Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Isreal
Nicole Leifer, Chemistry, Bar Ilan University, Ramat Gan, Isreal
Gil Goobes, Chemistry, Bar Ilan University, Ramat Gan, Isreal
Fransis Amalraj, Chemistry, Bar Ilan University, Ramat Gan, Isreal
Boris Markovsky, Chemistry, Bar Ilan University, Ramat Gan, Isreal
Doron Aurbach, Chemistry, Bar Ilan University, Ramat Gan, Isreal

In this presentation, we focus on recent studies of electrode materials for positive electrodes (cathodes) in lithium-ion batteries (LIB). We synthesized high-energy layered-layered structurally integrated materials of the general formulae of xLi₂MnO₃^.(1-x)Li[Mn-Ni-Co]O₂, as well as Ni-rich lithiated oxides comprising Mn, Co, and studied their electrochemical behavior in Li-cells.

It was found that surface modification of these materials by thin nm-sized layers of AlF₃, ZrO₂ or doping with Al³⁺, Zr⁴⁺ resulted in the improvement of the cathodes’ cycling stability, reduced capacity fading, more stable surface chemistry developed upon cycling and aging, and lower impedance. It should be emphasized that surface coatings and cationic doping resulted also in lower heat evolved upon reactions of the electrodes with LIB solutions.

We will present new results on structural changes and layered-to-spinel transitions of xLi₂MnO₃^.(1-x)Li[Mn-Ni-Co]O₂ and Ni-rich materials upon charge/discharge measured by in-situ XRD, and electron diffraction.Enter the body of your abstract here