arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2411.00536cond-mat.mtrl-scicond-mat.mes-hall
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二维MnBX单层作为具有创纪录高容量和快速扩散的钠离子电池负极材料

Two-dimensional MnBX monolayer as promising anode with record-high capacity and fast diffusion for Na-ion battery

Yue Kuai, Changcheng Chen, Pengfei Lu

AI总结:

本研究基于第一性原理基团结构搜索设计MnB、MnB2、MnB6三种二维单层体系,证实其兼具稳定性与金属性,作为钠离子电池负极具备高容量、低扩散势垒等优势,为富硼二维电极能源应用提供新方向。

摘要:

基于第一性原理的基团结构搜索方法,研究人员设计了MnB、MnB2和MnB6单层二维体系,并考察了它们的结构、稳定性、电子性质以及作为钠离子电池负极的性能。研究结果表明,MnB、MnB2和MnB6单层二维体系具有高热稳定性、力学稳定性、动力学稳定性以及独特的金属特性。当应用于钠离子电池时,这三种MnB、MnB2和MnB6单层均表现出高存储容量、低扩散势垒和适中的开路电压。由于其独特的结构,MnB单层呈现负泊松比以及极低的扩散势垒。MnB2单层作为钠离子电池负极时的理论容量超过MnB和MnB6单层。研究结果表明,富硼二维电极材料为能源应用开辟了新路径,尤其是MnB2和MnB6单层二维体系作为负极材料,兼具平面和波纹状单层结构的优势。

英文摘要:

Based on the group structure search method of first principles, MnB, MnB2, and MnB6 monolayer two-dimensional systems were designed and their structure, stability, electronic properties, as well as performance as anodes for sodium-ion batteries were examined. The findings indicate that the MnB, MnB2, and MnB6 monolayer two-dimensional systems possess high thermal stability, mechanical stability, dynamic stability, and distinctive metallic properties. When utilized in sodium-ion batteries, these MnB, MnB2, and MnB6 monolayers demonstrate high storage capacity, low diffusion barriers, and moderate open-circuit voltage. Due to its unique structure, the MnB monolayer presents a negative Poisson's ratio and a very low diffusion barrier. The theoretical capacitance of the MnB2 monolayer, when acting as an anode for sodium-ion batteries, exceeds that of the MnB and MnB6 monolayers. The research results reveal that boron-rich two-dimensional electrode materials pave a new way for energy applications. Particularly, MnB2 and MnB6 monolayer two-dimensional systems, as anode materials, incorporate the advantages of both planar and corrugated monolayer structures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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