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提出利用氦渗透法优化LiFePO_4材料的结晶生长过程,达到提高材料电化学性能的目的。采用磁控溅射法制备含氦LiFePO_4薄膜电极,利用扫描电镜观察样品的微观形貌,发现样品表面与截面皆呈现多孔结构。用X射线衍射仪分析含氦LiFePO_4薄膜电极的晶体结构。结果表明,氦渗入薄膜后显著增强了材料在29.81°的衍射峰强度,而此处正对应了锂离子在LiFePO_4材料中的扩散路径([010]方向)。这表明含氦LiFePO_4薄膜中存在有利于材料脱锂/嵌锂的结晶择优生长取向,会导致薄膜电极电化学性能的提高。
It is proposed that the crystal growth process of LiFePO 4 should be optimized by helium infiltration method so as to improve the electrochemical performance of the material. The LiFePO 4 thin film electrode was prepared by magnetron sputtering. The microstructure of LiFePO 4 thin film was observed by scanning electron microscopy. The surface and cross section of the sample were both porous. Analysis of Crystal Structure of LiFePO_4 Thin Films Electrode Containing Li by X - ray Diffraction. The results show that the diffraction peak intensity of the material at 29.81 ° is significantly enhanced by the infiltration of helium into the thin film, which corresponds to the diffusion path (direction of [010]) of lithium ions in the LiFePO 4 material. This indicates that there is a preferential crystal growth orientation in the Li-containing LiFePO_4 thin film that is conducive to the material delithiation / intercalation lithium, which leads to the improvement of the electrochemical performance of the thin film electrode.