Exploration of a Metastable Normal Spinel Phase Diagram for the Quaternary Li-Ni-Mn-Co-O System

Abstract

In an attempt to enlarge the normal spinel phase diagram for the quaternary Li-Ni-Mn-Co-O system, the transformation at moderate temperatures (150-210 degrees C) of layered Li-0.5(Ni1-y-zMnyCoz)O-2 (R (3) over barm), which were obtained by an ambient-temperature extraction of lithium from Li-0.5(Ni1-y-zMnyCoz)O-2, into normal spinel-like (Fd (3) over barm) Li(Ni1-y-zMnyCoz)(2)O-4 has been investigated. The phase-conversion mechanism has been studied by joint time-of-flight (TOF) neutron and X-ray diffractions, thermogravimetric analysis, and bond valence sum map. The ionic diffusion of lithium (3a, 6c) and nickel (3a, 3b) ions has been quantified as a function of temperature. The investigated spinel phases are metastable, and they are subject to change into rock-salt phases at higher temperatures. The phases have been characterized as cathodes in lithium-ion cells. The study may serve as a strategic model to access other metastable phases by low-temperature synthesis approaches.