Oxygen‐Driven Structural Reorganization by Trace Water Enabling Fast Li‐Ion Transport in a Pliable Solid Electrolyte
Source abstract
Abstract
ABSTRACT The hygroscopic property of solid electrolytes has long been regarded as a critical weakness, as exposure to ambient humidity typically induces decomposition and a loss of ionic conductivity. In this study, we reveal a counterintuitive yet constructive role of trace water in enhancing ion transport in a gallium‐based pliable halide solid electrolyte. Controlled exposure of 2LiCl–GaF 3 to trace amounts of water introduces oxygen into the structure and reorganizes the local environments around gallium and lithium. This oxygen‐driven structural reconfiguration forms Ga–O and Li–O linkages and diversifies the local environment of gallium by converting its coordination from sixfold to fourfold. It reduces the average Li–anion binding strength and flattens the Li‐ion migration energy landscape, resulting in enhanced Li‐ion transport. These changes collectively increase the ionic conductivity by more than two orders of magnitude, from 10 −2 mS cm −1 to over 3 mS cm −1 , while imparting amorphous and deformable characteristics to the 2LiCl‐GaF 3 electrolyte. This study demonstrates that the interaction between trace water and complex anion frameworks can be harnessed to simultaneously tailor structural and transport properties, offering a new design strategy for high‐performance oxyhalide solid electrolytes.
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Research context
OpenAlex topics: Advanced Battery Materials and Technologies · Thermal Expansion and Ionic Conductivity · Advancements in Battery Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Materials Science and Engineering Seoul National University (SNU) Seoul Republic of Korea
Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea
Institute of Physical Chemistry and Center for Materials Research (ZfM) Justus‐Liebig‐University Giessen Giessen Germany
Department of Chemistry University of Cambridge Cambridge United Kingdom
Research Institute of Advanced Materials Seoul National University Seoul Republic of Korea
School of Transdisciplinary Innovations Seoul National University (SNU) Seoul Republic of Korea
Research Institute of Advanced Materials (RIAM) Seoul National University (SNU) Seoul Republic of Korea
Institute for Rechargeable Battery Innovations Research Seoul National University (SNU) Seoul Republic of Korea
Funding
National Research Foundation of Korea · National Research Council of Science and Technology · National Supercomputing Center, Korea Institute of Science and Technology Information · Korea Institute of Machinery and Materials
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