Thermal stability of lithium-rich manganese-based cathode

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

10 Scopus Citations
View graph of relations

Author(s)

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)242-246
Journal / PublicationSolid State Ionics
Volume268
Issue numberPB
Publication statusPublished - 15 Dec 2014

Abstract

Thermal stability of a lithium-rich layered oxide cathode material with composition 0.5Li4/3Mn2/3O2-0.5LiNi1/3Co1/3Mn1/3O2 (LMO-NCM) is investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Investigated material shows higher thermal stability (higher onset temperature) than LiCoO2. The state of charge and previous cycling history of LMO-NCM, particularly activation of lithium manganese oxide (LMO) "component" during first charge, affect its thermal stability. Activation of LMO has an ambivalent effect on cathode thermal stability: on the one hand, the onset temperature of cathode decomposition is increased, probably due to the change in oxidation states of Ni, Co and Mn after the first cycle. On the other hand, the enthalpy of decomposition increases, presumably due to formation of unstable oxygen in the lattice. X-ray diffraction (XRD) analyses of cathodes before and after thermal decomposition at 600 °C indicate differences in decomposition reactions of charged cathodes, depending on state of charge and cycling history.

Research Area(s)

  • 0.5Li4/3Mn2/3O2-0.5LiNi1/3Co1/3Mn1/3O2, Lithium-ion battery, Lithium-rich layered oxide, Thermal stability

Citation Format(s)

Thermal stability of lithium-rich manganese-based cathode. / Geder, Jan; Song, Jay Hyok; Kang, Sun Ho; Yu, Denis Y.W.

In: Solid State Ionics, Vol. 268, No. PB, 15.12.2014, p. 242-246.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review