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作为高性能K离子电池的阳极材料的二维功能化MBene Mg₂B₃T (T = O,H,和F) 单层

Fengzhang Tang¹, Jiafei Pang¹, Jinni Yang¹

¹Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China. scu_kuang@163.com.

Physical chemistry chemical physics : PCCP

|September 30, 2024

概括

2D金属化物的表面功能化增强了它们对电池阳极的稳定性. 用O,H和F组终止Mg2B3单层,可以提高离子储存能力和结构完整性.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
计算化学的计算化学

背景情况:

二维 (2D) 金属化物是电池的有希望的高性能阳极材料.
2D材料的表面终结是实际电池应用的关键挑战.

研究的目的:

研究O,H,F和Cl表面功能化的对Mg2B3单层的影响.
评估功能化Mg2B3单层的稳定性和电子性能.
评估它们作为离子电池的阳极材料的潜力.

主要方法:

运用第一原则计算来建模和分析功能化的Mg2B3结构.
进行了能量,机械,运动和热力学稳定性研究.
计算了电子特性和离子储存能力.

主要成果:

发现所有Mg2B3T (T = O,H,F,Cl) 单层都是金属的.
单层Mg2B3O,Mg2B3H和Mg2B3F显示出高离子储存能力 (分别为826,980和804mAhg-1).
与原始的Mg2B3单层相比,功能化单层在化过程中体积膨胀显著减少 (<0.08%),归因于表面组.

结论:

表面功能化,特别是O,H和F,提高了Mg2B3单层电池应用中的稳定性.
这些功能化材料显示出作为下一代电池的高容量阳极材料的巨大潜力.
这些发现为设计具有提高性能和稳定性的新二维阳极材料提供了宝贵的见解.

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