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首页> 外文期刊>Latvian Journal of Physics and Technical Sciences >Structure and Electrochemical Characteristics of LiFePO4 as Cathode Material for Lithium-Ion Batteries
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Structure and Electrochemical Characteristics of LiFePO4 as Cathode Material for Lithium-Ion Batteries

机译：锂离子电池正极材料LiFePO4的结构和电化学特性

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摘要

Structure and Electrochemical Characteristics of LiFePO4 as Cathode Material for Lithium-Ion BatteriesTo prepare cathode material for lithium batteries, LiFePO4 powder was sputtered using an RF magnetron. Thin LiFePO4 films were obtained on different ~1000 nm thick substrates. The compositional and morphological examination of these films by SEM has shown that on a silicon substrate the annealed nano-crystalline thin film of LiFePO4 material condenses in larger monocrystals (with thin film disappearance), while such a film on the stainless steel substrate coalesces in a uniform nano-structured layer after annealing. As shown by the energy-dispersive X-ray analysis, the annealed film consists of phosphorus, iron, and oxygen in the ratio corresponding to the stoichiometric LiFePO4. Cyclic voltammograms of the LiFePO4 thin layer were obtained with typical red-ox reaction peaks characterizing the electrochemical lithium insertion/extraction reactions in LiFePO4. The obtained thin films have a relatively high charge capacity of 127 mAh g-1.
机译：作为锂离子电池正极材料的LiFePO4的结构和电化学特性为了制备锂电池正极材料，使用RF磁控管溅射LiFePO4粉末。在不同的〜1000 nm厚基板上获得了LiFePO4薄膜。通过SEM对这些膜的组成和形态学检查表明，在硅衬底上，退火后的LiFePO4材料纳米晶体薄膜凝结成较大的单晶（薄膜消失），而在不锈钢衬底上的这种薄膜则聚结成单晶。退火后形成均匀的纳米结构层。如能量色散X射线分析所示，退火膜由磷，铁和氧组成，其比例对应于化学计量的LiFePO4。获得具有典型的氧化还原反应峰的LiFePO4薄层的循环伏安图，该峰表征了LiFePO4中的电化学锂插入/萃取反应。所获得的薄膜具有相对较高的充电容量，为127 mAh g-1。

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