在最富的二元斯坦尼德晶体Li5Sn中,内在的低导热率
Zhen Tong1, Traian Dumitrică2, Thomas Frauenheim3,4
1School of Advanced Energy, Sun Yat-Sen University, Shenzhen 518107, China.
The journal of physical chemistry letters
|September 5, 2023
概括
我们计算了Li5Sn的导热率,这是离子电池的新材料. 这种材料具有非常低的导热率,这对于电池的热管理至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 计算材料科学科学 计算材料科学
背景情况:
- 准确的导热率 (κ) 预测对于设计高效的离子电池至关重要.
- 富含的材料,如Li5Sn,由于其独特的结合和声子特性,呈现复杂的热传输现象.
研究的目的:
- 计算新合成的晶体材料Li5Sn.的网格导热率 (κ).
- 研究Li5Sn.中复杂的热传输机制,包括粒子状和玻璃状元件.
- 为离子电池的系统级热模型提供见解.
主要方法:
- 从一开始就采用了格子动力学和统一的热传输理论.
- 考虑了温度依赖的原子间力常数,重新规范的声频率,以及三和四声散射.
- 对实验阶段和预测阶段沿着晶体学方向计算了声子寿命和导热率.
主要成果:
- 对Li5Sn.的Cmcm (0.5990.961 W/mK) 和Immm (0.9081.385 W/mK) 阶段的预测非常低的室温 κ值.
- 观察到复杂的晶体行为与显著的玻璃般的热传输 (>20%以上室温).
- 确定了 κ 的异常温度依赖,受弱结合,声软化,硬化和强烈的不和性的影响.
结论:
- 5Sn具有非常低的晶格导热率,使其成为离子电池应用的有希望的材料.
- 材料的热传输的特点是粒子状和玻璃状贡献的复杂相互作用.
- 预测的热性能可以为离子电池的先进热管理策略的开发提供信息.
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