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合成和描述Li₄(OH)₃Br用于储存热能

Emily Milan¹, James A Quirk², John Cattermull^3,1

¹Department of Materials, University of Oxford, Oxford OX1 3PH, U.K.

ACS applied energy materials

|May 2, 2025

概括

氧化 (Li ₄(OH) ₃Br) 之前被高估为热能储存 (TES). 这项研究确定了一个稳定的阶段,揭示了实践TES应用的较低,经过实验验证的融热量.

科学领域:

材料科学材料科学材料科学
固态化学固态化学
储能储能储能储能储能储能

背景情况:

周学化合物Li (OH) (Br) 是潜在的潜热热能储存 (TES) 候选物.
以前的理论计算预测了高融度 (804 Jg-1) 在300°C左右,但实验值明显低 (≤250 Jg-1).

研究的目的:

为了解决Li₄(OH)₃Br.Br的报告化热量中的差异.
为了确定Li₄(OH)₃Br的热力学稳定的晶体结构,以进行准确的热能储存评估.

主要方法:

通过X射线衍射和热分析来表征材料.
理论建模 (密度函数理论) 用于预测晶体结构和特性.
差分扫描热量计用于实验性测量融热量.

主要成果:

文献中的晶体结构与一个转移稳定的水合相相对应,在175°C左右脱水.
热力学稳定的Li₄(OH)₃Br相结晶在*Pmnm*空间组中.
实验测量纯Li的化热量为263 ± 3Jg-1.
理论计算预测稳定阶段的融化度为260 Jg−1,与实验结果一致.

结论:

之前报道的Li₄(OH)₃Br的高融度是基于一个转移稳定的水合相.
稳定的Li (OH) (Br) 阶段提供了263 Jg (-1) 的验证化热量.
仍然是热能存储的有前途的材料,现实性能参数现在已经确定在290°C左右.

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