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Garnet‐Polymer Composite Electrolytes with High Li + Conductivity and Transference Number via Well‐Fused Grain Boundaries in Microporous Frameworks
Author(s) -
Peng Xiang,
Huang Kai,
Song Shipai,
Wu Fang,
Xiang Yong,
Zhang Xiaokun
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202000202
Subject(s) - microporous material , materials science , electrolyte , composite number , ionic conductivity , grain boundary , microstructure , chemical engineering , lithium (medication) , ceramic , fast ion conductor , conductivity , polymer , composite material , chemistry , electrode , medicine , engineering , endocrinology
A garnet‐polymer composite electrolyte with high Li + conductivity and transference number is developed using microporous Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) framework as the matrix. The LLZTO framework, fabricated by a template‐assisted gel‐casting process, possesses micron‐sized grains and well‐fused grain boundaries, eliminating the low‐conductive bottleneck at the interfaces between the ceramic blocks, and providing conductive and continuous networks for Li + transport. As a result, the garnet‐polymer composite electrolyte displays a high ionic conductivity (2.61×10 −4 S cm −1 at 25 °C), an ultrahigh Li + transference number of 0.71, as well as excellent thermal, structural, and electrochemical stabilities. Benefiting from the desired physical and chemical properties, the presented composite electrolyte enables a Li−Li cell to be cycled for more than 600 h at 25 °C. In addition, the integrated LiFePO 4 /CPCE/Li cells also show excellent cycling stability with a specific capacity of 133.2 mAh g −1 after 100 cycles under 50 °C. This study demonstrates a significant optimization on the microstructure of composite electrolytes that can be utilized for all‐solid‐state lithium batteries.