Eliminating Lightning-Rod Effect of Lithium Anodes via Sine-Wave Analogous MXene Layers,Advanced Energy Materials

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Eliminating Lightning-Rod Effect of Lithium Anodes via Sine-Wave Analogous MXene Layers
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-08-07 , DOI: 10.1002/aenm.202201181
Jianan Gu ₁ , Hao Chen ₁ , Yu Shi ₁ , Zhenjiang Cao ₁ , Zhiguo Du ₁ , Bin Li ₁ , Shubin Yang ₁

Affiliation

Lithium metal anodes are regarded as the most promising candidate for rechargeable lithium-based batteries, but uncontrollable Li dendrites hinder further applications. Here, sine-wave analogous MXene (Ti₃C₂T_x) (SWA-MXene) layers are produced by spreading aqueous MXene dispersion onto the sectional surface of a metallic coil and subsequently drying at room temperature. COMSOL Multiphysics simulations demonstrate that the low curvature in SWA-MXene layers homogenizes the distributions of lithium ions and electric field, efficiently eliminating the lightning-rod effect on the surface of aligned electrodes in the process of Li deposition. As a result, the flexible SWA-MXene layers show a low overpotential for lithium nucleation (≈13.5 mV at 0.05 mA cm⁻²) and deep plating–stripping capacities up to 40 mAh cm⁻², as well as a long cycle life up to 1250 h. Full cells consisting of a SWA-MXene–Li anode and a LiFePO₄ cathode also exhibit a durable cycle life up to 420 cycles at 1088 mA g⁻¹.

中文翻译：

通过正弦波模拟 MXene 层消除锂阳极的避雷针效应

锂金属负极被认为是可充电锂基电池最有希望的候选者，但不可控制的锂枝晶阻碍了进一步的应用。在这里，正弦波模拟 MXene (Ti ₃ C ₂ T _x ) (SWA-MXene) 层是通过将 MXene 水分散体涂抹在金属线圈的截面表面上并随后在室温下干燥来产生的。COMSOL Multiphysics 仿真表明，SWA-MXene 层的低曲率使锂离子和电场的分布均匀化，有效消除了锂沉积过程中对齐电极表面的避雷针效应。因此，柔性 SWA-MXene 层显示出较低的锂成核过电位（在 0.05 mA cm 时约为 13.5 mV^-2 ) 和高达 40 mAh cm ^-2的深度电镀剥离能力，以及高达 1250 小时的长循环寿命。由 SWA-MXene-Li 阳极和 LiFePO _{4阴极组成的完整电池在 1088 mA g}^-1下也表现出高达 420 次循环的持久循环寿命。

更新日期：2022-08-07

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