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arXiv 2204.04764cond-mat.mtrl-scicond-mat.mes-hall
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基于V₂C的锂电池:磁相和Hubbard相互作用的影响

V$_2$C-based lithium batteries: The influence of magnetic phase and Hubbard interaction

Jhon W. González, Sanber Vizcaya, Eric Suárez Morell

AI总结:

本研究针对V₂C基锂电池电极的性能计算问题,采用含线性响应法得到的Hubbard参数的第一性原理计算,考虑钒电子强关联与磁相影响,发现体系为反铁磁且相关性能量依赖磁相,可为Hubbard参数验证提供依据。

摘要:

MXenes是一类二维材料,因其高比容量而有望用作锂电池电极。为此,有必要评估不同锂浓度下的锂吸附能、开路电压幅值等物理量。本文通过第一性原理计算表明,在V₂C单层中,必须考虑钒所属电子间的强关联,才能得到这些物理量的正确结果。我们采用通过线性响应方法得到的Hubbard耦合参数来纳入这种关联效应。研究发现该体系是反铁磁性的,且所研究的物理量依赖于所考虑的磁相。实验结果可间接验证理论Hubbard参数的理论值。

英文摘要:

MXenes are a family of two-dimensional materials that could be attractive for use as electrodes in lithium batteries due to their high specific capacity. For this purpose, it is necessary to evaluate magnitudes such as the lithium adsorption energy and the magnitude of the open-circuit voltage for different lithium concentrations. In this paper, we show through first principles calculations that in a V$_2$C monolayer we must consider the high correlation between the electrons belonging to vanadium to obtain correct results of these quantities. We include this correlation employing the Hubbard coupling parameter obtained by a linear response method. We found that the system is antiferromagnetic and that the quantities studied depend on the magnetic phase considered. Indirectly, experimental results could validate the theoretical value of the theoretical Hubbard parameter.

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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