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arXiv 2409.09690cond-mat.mtrl-sci
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反钙钛矿c-Na3HS固态电解质的第一性原理洞察

First Principles Insight into Antiperovskite c-Na3HS Solid State Electrolyte

Sananya Chakraborty, Nidhi Verma, Ashok Kumar

AI总结:

本研究采用基于DFT的第一性原理和AIMD模拟,探究反钙钛矿c-Na3HS作为钠离子电池固态电解质的潜力,证实其多方面稳定性,并发现空位与卤素掺杂可大幅提升离子电导率,证明其应用可行性。

摘要:

我们探究了新型反钙钛矿c-Na3HS作为钠离子电池固态电解质的潜力。为研究c-Na3HS的动力学稳定性、相稳定性、热稳定性、力学稳定性以及离子、电子和扩散特性,我们采用了基于密度泛函理论(DFT)的第一性原理方法和从头算分子动力学(AIMD)模拟。c-Na3HS不存在虚频声子模,表明其具有动力学稳定性。关键发现包括较低的凸包以上能量、4.35 eV的宽带隙,以及力学稳定性分析显示c-Na3HS具有中等硬度且略脆的特性。计算得出c-Na3HS中Na的活化能约为300 meV,引入Na空位后降至约100 meV。通过在c-Na3HS结构中进行空位和卤素掺杂,离子电导率可提升约3个数量级。因此,所得结果表明c-Na3HS是钠离子电池固态电解质的可行备选材料。

英文摘要:

We explore the potential of novel antiperovskite c-Na3HS to be a solid-state electrolyte for sodium-ion batteries. To investigate the dynamical stability, phase stability, thermal stability, mechanical stability and ionic, electronic and diffusive properties of c-Na3HS, the first-principles methods based on density functional theory (DFT) and ab-initio molecular dynamics (AIMD) simulations have been employed. c-Na3HS has no imaginary phonon modes indicating its dynamical stability. Key findings include small energy-above-hull, the wide band gap of 4.35 eV and mechanical stability analysis that indicates the moderately hard and a little brittle nature of c-Na3HS. The activation energy of Na in c-Na3HS is calculated to be ~300 meV that reduces to ~ 100 meV on introducing Na-vacancy. The ionic conductivity can be enhanced up to ~3 order of magnitude by vacancy and halogen doping in c-Na3HS structure. Thus, the obtained results indicate that c-Na3HS can be viable option to be utilized as solid-state electrolyte in sodium-ion batteries.

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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