arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2112.12366cond-mat.mtrl-sci
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Li2MTiO4和Na2MTiO4(M = V,Cr,Mn,Fe,Co,Ni)阴极性质的第一性原理研究

First-Principles Study on Cathode Properties of Li2MTiO4 and Na2MTiO4 (M = V, Cr, Mn, Fe, Co, Ni)

Kunihiko Yamauchi, Hiroyoshi Momida, Tamio Oguchi

摘要:

采用密度泛函理论计算方法研究了Na_2MTiO_4(M:过渡金属元素)的阴极性质。层状结构和无序结构之间的稳定性进行了重点比较与Li 2 MTiO 4原型的情况下。结果表明,在Na_2MTiO_4中,层状结构比无序结构更稳定,而在Li_2MTiO_4中,层状结构和无序结构的稳定性相近。在层状结构的Na 2 MTiO 4中,在充/放电反应期间在中间化合物处的形成能力显著低,导致不稳定的电压-容量曲线。机器学习分析表明,这些结构之间的总能量差异可以通过离子半径的简单函数来描述。

英文摘要:

The cathode properties of Na2MTiO4 (M: transition-metal element) are investigated by means of density-functional-theory calculations. The stability between the layered structure and the disordered structure are focused in comparison with the Li2MTiO4 prototypical case. It is found that the layered structure is more stable than the disordered structure in Na2MTiO4 while those structure shows the similar stability in Li2MTiO4. In layered-structure Na2MTiO4, the formation enthalpies at the intermediate compounds during charge/discharge reactions are significantly low, leading to the unstable voltage-capacity profiles. A machine-learning analysis reveals that the total-energy difference between these structures can be described by a simple function of ionic radii.

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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