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NaZr₂(PO₄)₃ - 一种立方朗贝尼特型的离子固体导体

Sergey N Marshenya¹, Alexey G Scherbakov¹, Artem D Dembitskiy¹

¹Skolkovo Institute of Science and Technology, Skoltech, 121205, Moscow, Russian Federation. sergey.marshenya@skoltech.ru.

Dalton transactions (Cambridge, England : 2003)

|September 11, 2024

概括

研究人员为固体电解质合成了兰贝尼特类型的酸 (NaZr2(PO4) 3). 这种材料具有良好的Na+导电性和电化学稳定性,对于离子电池至关重要.

科学领域:

材料科学材料科学材料科学
固态化学固态化学
电化学电化学电化学

背景情况:

由于NaSICON阶段的形成,合成兰贝尼特类型的酸盐与像 (Na+) 这样的小离子是很困难的.
高温固态反应往往产生不必要的相,阻碍了新型固体电解质的发展.

研究的目的:

为了开发一个合成路径的兰贝尼特类型的酸 (NaZr2(PO4) 3).
为了研究合成材料的晶体结构,热行为和离子 (Na+) 导电性.
评估其作为离子电池固体电解质的潜力.

主要方法:

在酸 (NH4Zr2(PO4) 3) 和酸 (NaNO3) 之间发生机械化学活性离子交换反应.
用X射线衍射 (XRD) 来精制晶体结构.
福里埃转换红外光谱 (FTIR) 用于验证.
热分析 (高达730°C).
电化学阻抗光谱 (EIS) 用于导电性测量.
密度函数理论 (DFT) 对带隙和电化学稳定性的计算.

主要成果:

通过机械化学离子交换途径成功合成了朗贝尼特类型NaZr2(PO4) 3.
NaZr2(PO4)3表现出高达730°C的稳定性,在25-500°C之间具有负热膨胀.
在225°C达到1×10^-6 S cm^-1的Na+导电性,电子导电性低,电化学稳定性窗口宽 (1.39-4.18V对Na/Na+).

结论:

朗贝尼特类型NaZr2(PO4)3是离子电池中固体电解质的有希望的候选物.
开发的合成方法克服了与兰贝尼特类型酸盐合成相关的挑战.
对兰贝尼特结构酸盐的进一步研究可能会导致先进的电池材料.

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