Microstructural and electrochemical properties of LiTiyCo1-yO2 film cathodes prepared by RF sputtering
Microstructural and electrochemical properties of LiTiyCo1-yO2 film cathodes prepared by RF sputtering
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DOI：
10.1007/s10008-015-2963-z
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发表时间：
2015-07
影响因子：
2.5
通讯作者：
K. Sivajee Ganesh;B. Purusottam Reddy;P. Jeevan Kumar;K. Jayanthbabu;P. Rosaiah;O. Hussain
中科院分区：
文献类型：
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作者：
K. Sivajee Ganesh;B. Purusottam Reddy;P. Jeevan Kumar;K. Jayanthbabu;P. Rosaiah;O. Hussain
采用射频磁控溅射技术在金属化Si衬底上制备了LiTiyCo 1-yO 2（y= 0，0.02，0.05，0.1）薄膜。在250 °C的衬底温度下沉积膜，随后在受控氧环境中在600 °C下退火3小时。薄膜具有（003）、（101）和（104）择优取向，为单相六方结构，空间群为Rm。在489和598 cm-1处观察到的两个明确的拉曼峰对应于Egand A1 g模式，证实了六方层状结构。用原子力显微镜观察了晶粒尺寸和晶粒分布。Pt//LiTiyCo 1-yO 2薄膜阴极在水溶液中的循环伏安研究显示，在预期的电位下，Pt//LiTiyCo 1-yO 2薄膜阴极具有完美的氧化还原峰。与纯Pt//LiCoO 2相比，Pt//LiTi0.02Co0.98O2薄膜阴极表现出更好的放电容量（约65 μA h cm−2μm− 1）和良好的循环稳定性。电化学阻抗分析表明，Ti掺杂LiCoO 2薄膜阴极具有较低的电荷转移电阻，放电容量较好。
LiTiyCo1-yO2(y= 0, 0.02, 0.05, 0.1) thin films were deposited on metalized Si substrates using RF magnetron sputtering technique. The films were deposited at a substrate temperature of 250 °C with subsequent annealing at 600 °C for 3 h in controlled oxygen environment. The films exhibited predominant (003), (101), and (104) orientations representing single-phase hexagonal structure withRmspace group. Two well-defined Raman peaks observed at 489 and 598 cm−1corresponding to Egand A1gmodes confirm the hexagonal layered structure. The grain size and grain distribution were observed using atomic force microscopy. The cyclic voltammetry studies on Pt//LiTiyCo1-yO2film cathodes in aqueous region exhibited perfect redox peaks at expected potentials. The Pt//LiTi0.02Co0.98O2film cathode exhibited better discharge capacity of about 65 μA h cm−2μm−1with good cycling stability compared to pure Pt//LiCoO2. The electrochemical impedance analysis revealed a lower charge transfer resistance in Ti doped LiCoO2film cathode, resulting better discharge capacity.