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  1. Article ; Online: Activating reversible carbonate reactions in Nasicon solid electrolyte-based Na-air battery via in-situ formed catholyte.

    Park, Heetaek / Kang, Minseok / Lee, Donghun / Park, Jaehyun / Kang, Seok Ju / Kang, Byoungwoo

    Nature communications

    2024  Volume 15, Issue 1, Page(s) 2952

    Abstract: Out of practicality, ambient air rather than oxygen is preferred as a fuel in electrochemical systems, but ... ...

    Abstract Out of practicality, ambient air rather than oxygen is preferred as a fuel in electrochemical systems, but CO
    Language English
    Publishing date 2024-04-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-024-47415-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Research Progresses of Garnet-Type Solid Electrolytes for Developing All-Solid-State Li Batteries.

    Kim, Abin / Woo, Seungjun / Kang, Minseok / Park, Heetaek / Kang, Byoungwoo

    Frontiers in chemistry

    2020  Volume 8, Page(s) 468

    Abstract: All-Solid-State Batteries (ASSBs) that use oxide-based solid electrolytes (SEs) have been considered as a promising energy-storage platform to meet an increasing demand for Li-ion batteries (LIBs) with improved energy density and superior safety. However, ...

    Abstract All-Solid-State Batteries (ASSBs) that use oxide-based solid electrolytes (SEs) have been considered as a promising energy-storage platform to meet an increasing demand for Li-ion batteries (LIBs) with improved energy density and superior safety. However, high interfacial resistance between particles in the composite electrode and between electrodes and the use of Li metal in the ASBS hinder their practical utilization. Here, we review recent research progress on oxide-based SEs for the ASSBs with respect to the use of Li metal. We especially focus on research progress on garnet-type solid electrolytes (Li
    Language English
    Publishing date 2020-06-24
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2711776-5
    ISSN 2296-2646
    ISSN 2296-2646
    DOI 10.3389/fchem.2020.00468
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Understanding the effects of oxygen defects on the redox reaction pathways in LiVPO4F by combining ab initio calculations with experiments

    Park, Heetaek / Kim, Minkyung / Kang, ShinYoung / Kang, Byoungwoo

    Journal of materials chemistry A. 2019 May 28, v. 7, no. 21

    2019  

    Abstract: Tavorite LiVPO4F has great potential as a cathode material due to its high energy density, superior thermal stability and fast kinetics. It has been controversial whether the redox reaction pathway of LiVPO4F is symmetric or not, but the origin of such ... ...

    Abstract Tavorite LiVPO4F has great potential as a cathode material due to its high energy density, superior thermal stability and fast kinetics. It has been controversial whether the redox reaction pathway of LiVPO4F is symmetric or not, but the origin of such symmetric/asymmetric redox reaction pathways has not been clearly understood. By combining ab initio calculations with experiments, we found that oxygen defects on fluorine sites, OF−, can be a key factor that affects the symmetry of the redox pathway of LiVPO4F1−δOδ (δ < 1). The computational results indicate that (1) the thermodynamically metastable ‘triclinic’ polymorph of VPO4F1−δOδ, which maintains the structural symmetry of LiVPO4F, can be kinetically stabilized considering its marginally higher energy than the stable ‘monoclinic’ phase; and (2) the OF− defects slightly destabilize the intermediate phase (x = 0.667) (Li0.667VPO4F versus Li0.667VPO4F0.917O0.083), inferring that the presence of OF− defects can induce the asymmetric redox pathway of LiVPO4F1−δOδ. We also experimentally found that the concentration of OF− defects is critically affected by the synthesis process of LiVPO4F, and VPO4F with lower OF− concentration can support the possible presence of the metastable (triclinic) phase, leading to the redox pathway being prone to being symmetric. Therefore, controlling oxygen defects by a synthesis processes can affect electrochemical performance via different redox reaction pathways of LiVPO4F. This understanding provides further possibilities for improving the electrochemical performance.
    Keywords cathodes ; electrochemistry ; energy ; energy density ; fluorine ; oxygen ; redox reactions ; thermal stability
    Language English
    Dates of publication 2019-0528
    Size p. 13060-13070.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/c9ta03070k
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Sodium Ion Diffusion in Nasicon (Na3Zr2Si2PO12) Solid Electrolytes: Effects of Excess Sodium

    Park, Heetaek / Jung Keeyoung / Kang Byoungwoo / Kim Chang-Soo / Nezafati Marjan

    ACS Applied Materials & Interfaces. 2016 Oct. 19, v. 8, no. 41

    2016  

    Abstract: The Na superionic conductor (aka Nasicon, Na₁₊ₓZr₂SiₓP₃–ₓO₁₂, where 0 ≤ x ≤ 3) is one of the promising solid electrolyte materials used in advanced molten Na-based secondary batteries that typically operate at high temperature ( ... ...

    Abstract The Na superionic conductor (aka Nasicon, Na₁₊ₓZr₂SiₓP₃–ₓO₁₂, where 0 ≤ x ≤ 3) is one of the promising solid electrolyte materials used in advanced molten Na-based secondary batteries that typically operate at high temperature (over ∼270 °C). Nasicon provides a 3D diffusion network allowing the transport of the active Na-ion species (i.e., ionic conductor) while blocking the conduction of electrons (i.e., electronic insulator) between the anode and cathode compartments of cells. In this work, the standard Nasicon (Na₃Zr₂Si₂PO₁₂, bare sample) and 10 at% Na-excess Nasicon (Na₃.₃Zr₂Si₂PO₁₂, Na-excess sample) solid electrolytes were synthesized using a solid-state sintering technique to elucidate the Na diffusion mechanism (i.e., grain diffusion or grain boundary diffusion) and the impacts of adding excess Na at relatively low and high temperatures. The structural, thermal, and ionic transport characterizations were conducted using various experimental tools including X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). In addition, an ab initio atomistic modeling study was carried out to computationally examine the detailed microstructures of Nasicon materials, as well as to support the experimental observations. Through this combination work comprising experimental and computational investigations, we show that the predominant mechanisms of Na-ion transport in the Nasicon structure are the grain boundary and the grain diffusion at low and high temperatures, respectively. Also, it was found that adding 10 at% excess Na could give rise to a substantial increase in the total conductivity (e.g., ∼1.2 × 10–¹ S/cm at 300 °C) of Nasicon electrolytes resulting from the enlargement of the bottleneck areas in the Na diffusion channels of polycrystalline grains.
    Keywords anodes ; batteries ; cathodes ; dielectric spectroscopy ; differential scanning calorimetry ; electrolytes ; electrons ; microstructure ; models ; scanning electron microscopy ; sodium ; temperature ; X-ray diffraction
    Language English
    Dates of publication 2016-1019
    Size p. 27814-27824.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021%2Facsami.6b09992
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: Sodium Ion Diffusion in Nasicon (Na

    Park, Heetaek / Jung, Keeyoung / Nezafati, Marjan / Kim, Chang-Soo / Kang, Byoungwoo

    ACS applied materials & interfaces

    2016  Volume 8, Issue 41, Page(s) 27814–27824

    Abstract: The Na superionic conductor (aka Nasicon, ... ...

    Abstract The Na superionic conductor (aka Nasicon, Na
    Language English
    Publishing date 2016-10-04
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.6b09992
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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