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Lithium Ion‐Conducting Glass–Ceramics of Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 – x Li 2 O ( x =0.0–0.20) with Good Electrical and Electrochemical Properties
Author(s) -
Xu Xiaoxiong,
Wen Zhaoyin,
Wu Xiangwei,
Yang Xuelin,
Gu Zhonghua
Publication year - 2007
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/j.1551-2916.2007.01827.x
Subject(s) - materials science , fast ion conductor , differential scanning calorimetry , lithium (medication) , crystallization , ionic conductivity , analytical chemistry (journal) , microstructure , glass ceramic , electrochemical window , scanning electron microscope , electrochemistry , ceramic , mineralogy , electrolyte , chemical engineering , metallurgy , electrode , chemistry , composite material , medicine , physics , chromatography , engineering , thermodynamics , endocrinology
NASICON‐type structured Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 – x Li 2 O Li‐ion‐conducting glass–ceramics were successfully prepared from as‐prepared glasses. The differential scanning calorimetry, X‐ray diffraction, nuclear magnetic resonance, and field emission scanning electron microscope results reveal that the excess Li 2 O is not only incorporated into the crystal lattice of the NASICON‐type structure but also exists as a secondary phase and acts as a nucleating agent to considerably promote the crystallization of the as‐prepared glasses during heat treatment, leading to an improvement in the connection between the glass–ceramic grains and hence a dense microstructure with a uniform grain size. These beneficial effects enhance both the bulk and total ionic conductivities at room temperature, which reach 1.18 × 10 −3 and 7.25 × 10 −4 S/cm, respectively. In addition, the Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 –0.05Li 2 O glass–ceramics display favorable electrochemical stability against lithium metal with an electrochemical window of about 6 V. The high ionic conductivity, good electrochemical stability, and wide electrochemical window of LAGP–0.05LO glass–ceramics suggest that they are promising solid‐state electrolytes for all solid‐state lithium batteries with high power density.