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Effect of Pt and Au current collector in LiMn2O4 thin film for micro-batteries

机译:PT和Au集电器在微电池中为LIMN2O4薄膜的影响

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摘要

The crystal orientation and morphology of sputtered LiMn2O4 thin films is strongly affected by the current collector. By substituting Pt with Au, it is possible to observe in the x-ray diffraction pattern of LiMn2O4 a change in the preferential orientation of the grains from (111) to (400). In addition, LiMn2O4 thin films deposited on Au show a higher porosity than films deposited on Pt. These structural differences cause an improvement in the electrochemical performances of the thin films deposited on Au, with up to 50% more specific charge. Aqueous cells using thin film based on LiMn2O4 sputtered on Au or Pt as the cathode electrode present a similar retention of specific charge, delivering 85% and 100%, respectively, of the initial values after 100 cycles. The critical role of the nature of the substrate used in the morphology and electrochemical behaviour observed could permit the exploration of similar effects for other lithium intercalation electrodes.
机译:溅射的Limn2O4薄膜的晶体取向和形态受电流收集器的强烈影响。 通过用Au代替Pt,可以观察LiMn2O4的X射线衍射图案,从(111)到(400)的谷物的优先取向的变化。 此外,沉积在Au上的Limn2O4薄膜显示比沉积在Pt上的薄膜的孔隙率较高。 这些结构差异导致沉积在Au上的薄膜的电化学性能的改善,高达50%的比重。 使用基于LiMn2O4的薄膜在Au或pt上溅射的薄膜作为阴极电极的薄膜存在于100次循环后的初始值的相似保留,递送85%和100%。 在观察到的形态学和电化学行为中使用的基材的性质的关键作用可以允许探索与其他锂插层电极的类似效果。

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