Interfacial reaction during co‐sintering of lithium manganese nickel oxide and lithium aluminum germanium phosphate

Abstract

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. |DEINER Et al.

Digital Printing of Solid‐State Lithium‐Ion Batteries

“…The high sintering temperatures required for ceramic consolidation activate mass transport not just in the electrolyte, but also in the electrode material. At the electrode/electrolyte interface, this results in the formation of new, frequently insulating, phases . The difficulty then of 3D printing ceramic electrolytes and realizing their high conductivity in battery configuration is that of finding a process or chemistry to eliminate electrolyte/electrolyte grain boundaries without forming high resistance electrode/electrolyte interfacial phases.…”

Designing double-layered Si and Si/LATP nanocomposite anode for high-voltage aqueous lithium-ion batteries

“…27-1402). It was also found that the LATP-Si sample shows the presence of well-crystallized peaks of NASICON structured LATP (hexagonal setting of the rhombohedral space group (S.G. R-3c), (JCPDS No.40-0095)[19][20][21].Figure 1bshows the Scanning electron microscopy (SEM) images illustrating the surface morphology of LATP-Si composite film demonstrating a homogeneous morphology.Figure 1c shows the low-magnification transmission electron microscopy (TEM) images of Si-LATP structure denoting the uniform dispersion of Si nanoparticles in the LATP matrix. In order to further analyze the structural details, high-resolution TEM (HRTEM) images are taken (Fig.…”