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High temperature electrode‐electrolyte interface formation between LiMn 1.5 Ni 0.5 O 4 and Li 1.4 Al 0.4 Ge 1.6 ( PO 4 ) 3
Author(s) -
Robinson J. Pierce,
Kichambare Padmakar D.,
Deiner Jay L.,
Miller Ryan,
Rottmayer Michael A.,
Koenig Gary M.
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15294
Subject(s) - electrolyte , materials science , electrochemistry , lithium (medication) , cathode , chemical engineering , scanning electron microscope , electrode , analytical chemistry (journal) , composite material , chemistry , medicine , chromatography , engineering , endocrinology
All‐solid‐state lithium‐ion electrolytes offer substantial safety benefits compared to flammable liquid organic electrolytes. However, a great challenge in solid electrolyte batteries is forming a stable and ion conducting interface between the electrolyte and active material. This study investigates and characterizes a possible solid‐state electrode‐electrolyte pair for the high voltage active cathode material LiMn 1.5 Ni 0.5 O 4 ( LMNO ) and electrolyte Li 1+ x A l x Ge 2‐x ( PO 4 ) 3 ( LAGP ). In situ X‐ray diffraction measurements were taken on pressed pellets comprised of a blend of LMNO and LAGP during exposure to elevated temperatures to determine the product materials that form at the interface of LMNO and LAGP and the temperatures at which they form. In particular, above 600°C a material consistent with LiMn PO 4 was formed. Scanning electron microscopy and energy‐dispersive X‐ray spectroscopy were used to image the morphology and elemental compositions of product materials at the interface, and electrochemical characterization was performed on LMNO ‐coated LAGP electrolyte pellet half cells. Although the voltage of Li/ LAGP / LMNO assembled batteries was promising, thick interfacial phases resulted in high electrochemical resistance, demonstrating the need for further understanding and control over material processing in the LAGP / LMNO system to reduce interfacial resistance and improve electrochemical performance.