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Elucidating dynamic conductive state changes in amorphous lithium lanthanum titanate for resistive switching devices

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Title: Elucidating dynamic conductive state changes in amorphous lithium lanthanum titanate for resistive switching devices
Authors: Ryosuke Shimizu, Diyi Cheng, Guomin Zhu, Bing Han, Thomas S. Marchese, Randall Burger, Mingjie Xu, Xiaoqing Pan, Minghao Zhang, Ying Shirley Meng
Source: Next Materials, Vol 2, Iss , Pp 100102- (2024)
Publisher Information: Elsevier, 2024.
Publication Year: 2024
Collection: LCC:Technology
Subject Terms: Solid electrolyte, Resistive Switching, Li-ion battery, Oxygen vacancy, Technology
More Details: Exploration of novel resistive switching materials attracts attention to achieve neuromorphic computing that can surpass the limit of the current Von-Neumann computing for the time of Internet of Things (IoT). Battery materials priorly used to serve as an electrode or electrolyte have demonstrated metal-insulator transitions upon an electrical biasing due to resulting compositional change, which is desirable property for future resistive switching devices. For example, it has been suggested that solid-state electrolyte amorphous lithium lanthanum titanate (a-LLTO) changes in electronic conductivity depending on oxygen content. In this work, switching behavior of a-LLTO was investigated at both bulk- and nano-scale by employing a range of voltage sweep techniques, ultimately establishing a stable and optimal operating condition within the voltage window of − 3.5 V to 3.5 V. This voltage range effectively balances the desirable trait of a substantial resistance change by three orders of magnitude with the imperative avoidance of LLTO decomposition. Experiment and computation with different LLTO composition shows that LLTO has two distinct conductivity states due to Ti reduction. The distribution of these two states is discussed using simplified binary model, implying the conductive filament growth during low resistance state. Consequently, our study deepens understanding of LLTO electronic properties and encourages the interdisciplinary application of battery materials for resistive switching devices.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 2949-8228
Relation: http://www.sciencedirect.com/science/article/pii/S2949822823001028; https://doaj.org/toc/2949-8228
DOI: 10.1016/j.nxmate.2023.100102
Access URL: https://doaj.org/article/9d377a1a53a346af8dd833ec0ecc5875
Accession Number: edsdoj.9d377a1a53a346af8dd833ec0ecc5875
Database: Directory of Open Access Journals
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  Data: Next Materials, Vol 2, Iss , Pp 100102- (2024)
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  Data: Exploration of novel resistive switching materials attracts attention to achieve neuromorphic computing that can surpass the limit of the current Von-Neumann computing for the time of Internet of Things (IoT). Battery materials priorly used to serve as an electrode or electrolyte have demonstrated metal-insulator transitions upon an electrical biasing due to resulting compositional change, which is desirable property for future resistive switching devices. For example, it has been suggested that solid-state electrolyte amorphous lithium lanthanum titanate (a-LLTO) changes in electronic conductivity depending on oxygen content. In this work, switching behavior of a-LLTO was investigated at both bulk- and nano-scale by employing a range of voltage sweep techniques, ultimately establishing a stable and optimal operating condition within the voltage window of − 3.5 V to 3.5 V. This voltage range effectively balances the desirable trait of a substantial resistance change by three orders of magnitude with the imperative avoidance of LLTO decomposition. Experiment and computation with different LLTO composition shows that LLTO has two distinct conductivity states due to Ti reduction. The distribution of these two states is discussed using simplified binary model, implying the conductive filament growth during low resistance state. Consequently, our study deepens understanding of LLTO electronic properties and encourages the interdisciplinary application of battery materials for resistive switching devices.
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