DataVXACS Energy LettersPaper
journal article·2025-09-12

Ionic Transport Enhancement from Schottky Defect Formation in NaTaCl6 Halide Solid Electrolytes

Beom Jin Park, Jae-Seung Kim, Youngkyung Kim, Jinyeong Choe, Chanhyun Park, Hyeong-Jong Kim, Hyeok-Rae Cho, Kwang Ho Shin, Juho Lee, Jingyu Choi, Jiwon Kim, Hyun-Wook Lee, Yoon-Joo Ko, Jeongjae Lee, Dong-Hwa Seo, Sung-Kyun Jung

ACS Energy Letters· Volume 10· Issue 9
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Source abstract

Abstract

All-solid-state sodium batteries (ASSSB) are emerging as a viable energy storage technology due to their cost-effectiveness and high energy density. Halide-based electrolytes have shown potential due to their compatibility with high-voltage cathodes. However, most efforts to improve their sluggish ionic transport have focused on inducing amorphization via mechanochemical processes, leaving the direct impact of defect formation relatively unexplored. We demonstrate that introducing Schottky defects, specifically Na and Cl vacancies in NaTaCl 6, significantly increases ionic conductivity to 4.77 × 10 –4 S/cm without amorphization. Comprehensive experimental analyses and first-principles calculations reveal that these vacancies diversify the local Na environments, thereby lowering energy barriers. Furthermore, while high-energy ball milling effectively promotes partial amorphization, it also triggers unregulated defect formation, resulting in a wide range of conductivities. Our findings highlight the importance of defect engineering as both an alternative and complementary strategy to amorphization, offering a new route for designing high-performance sodium-based solid electrolytes.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Inorganic Chemistry and Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Energy Engineering, School of Energy and Chemical Engineering

Ulsan National Institute of Science and Technology (UNIST)

Department of Materials Science and Engineering

Seoul National University (SNU)

Korea Advanced Institute of Science and Technology (KAIST)

Physikalisch-Chemisches Institut, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 17, 35392 Gießen, Germany

National Center for Inter-University Research Facilities, Seoul National University

Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom

Research Institute of Advanced Materials (RIAM)

School of Transdisciplinary Innovations

Institute for Rechargeable Battery Innovations Research

Funding

Korea Institute of Machinery and Materials · Ministry of Science and ICT, South Korea · POSCO TJ Park Foundation · Korea Institute of Science and Technology · National Supercomputing Center, Korea Institute of Science and Technology Information

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