离子电导率及金属Na与Na3OCl界面的稳定性

IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY
Kana Ishigami, Reona Miyazaki, Takehiko Hihara
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引用次数: 0

摘要

固态Li+/Na+导体被用作全固态Li/Na电池的电解质。固体电解质的离子电导率和电极稳定性直接决定了电池的性能。除了固体电解质层外,Na+导体还被用作电极复合材料的添加剂,以增强其充放电性能。本文研究了富钠反钙钛矿Na3OCl的离子电导率和Na金属稳定性。通过控制Cl−/O2−的比例制备了Na3OCl。采用烧结法制备了致密的Na3OCl球团。240℃时,化学计量电导率为9.7 × 10−6 S/cm,过量cl - Na3OCl电导率为3.0 × 10−5 S/cm。作为Cl−/O2−取代的电荷补偿引入的Na+空位被认为是电导率提高的原因。当使用Na3OCl作为阳极复合材料时,Cl−/O2−的非化学计量也有效。Na3OCl在Na金属间相分解,表明Na3OCl对Na不稳定。这些结果与目前对Na3OCl阳极复合材料充放电性能的认识相矛盾。本研究结果表明,高结晶度Na3OCl的Na+导电性能和稳定性与以往报道的原位形成的Na3OCl阳极复合材料不同。结合其低导电性,Na金属界面的分解表明直接使用Na3OCl作为固体电解质是具有挑战性的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ion conductivity and the stability of the interface between Na metal and Na3OCl

Solid-state Li+/Na+ conductors are used as electrolytes in all-solid-state Li/Na batteries. The ion conductivity and electrode stability of solid electrolytes directly determine battery performances. In addition to the solid electrolyte layer, Na+ conductors are also used as additives in electrode composites to enhance the charge–discharge properties. In this study, the ion conductivity and Na metal stability of the Na-rich anti-perovskite Na3OCl were investigated. Na3OCl was prepared by controlling the Cl/O2− ratio. Dense pellets of Na3OCl were prepared by sintering. The conductivities of stoichiometric and Cl-excess Na3OCl are 9.7 × 10−6 and 3.0 × 10−5 S/cm at 240 °C, respectively. The Na+ vacancies, which were introduced as the charge compensation of Cl/O2− substitution, are considered to be the origin of the conductivity improvement. Off-stoichiometry of Cl/O2− can also be effective when Na3OCl is used as the anode composite. The decomposition of Na3OCl at the Na metal interphase was suggested, indicating that Na3OCl is unstable with Na. These results contradict the current knowledge on the charge–discharge performance of Na3OCl anode composites. The present results indicate that the Na+ conduction properties and stability in Na3OCl with high crystallinity are different from the in situ-formed Na3OCl in previously reported anode composites. In conjunction with its low conductivity, decomposition at the Na metal interphase indicates that the direct use of Na3OCl as a solid electrolyte is challenging.

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来源期刊
CiteScore
4.80
自引率
4.00%
发文量
227
审稿时长
4.1 months
期刊介绍: The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.
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