Premium
Interfacial reaction during co‐sintering of lithium manganese nickel oxide and lithium aluminum germanium phosphate
Author(s) -
Deiner L. Jay,
Howell Thomas G.,
Koenig Gary M.,
Rottmayer Michael A.
Publication year - 2019
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13242
Subject(s) - materials science , sintering , differential scanning calorimetry , nickel , x ray photoelectron spectroscopy , lithium (medication) , manganese , oxide , nickel oxide , chemical engineering , inorganic chemistry , metallurgy , chemistry , medicine , physics , engineering , thermodynamics , endocrinology
Understanding interface evolution during co‐sintering of solid Li‐ion conducting electrolytes and Li‐metal oxide cathodes is crucial to development of solid state batteries. In this work, X‐ray photoelectron spectroscopy, X‐ray diffraction (XRD), and thermal gravimetric analysis/differential scanning calorimetry (TGA/DSC) document changes at the lithium manganese nickel oxide (LMNO)/lithium aluminum germanium phosphate interface during sintering. Measurements are performed as a function of sintering gas environment (air vs N 2 ). Upon sintering, manganese is reduced from +4 to a mixture of +4, +3, and +2, while nickel is oxidized from +2 to a mixture of +2 and +3. The Mn 2+ species does not arise when LMNO is sintered alone. XRD identifies formation of new chemical phases, LiGe 0.5 M 0.5 PO 4 (where M = Mn 3+ or Ni 3+ ), AlPO 4 , and NiMn 2 O 4 , also not observed when LMNO is sintered alone. The emergence of resistive interfacial phases may offset the increase in conductivity expected when Mn 3+ is formed.