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LiCo0.8M0.2O2 (M=Ni,Zr) films were fabricated by radio frequency sputtering deposition combined with conventional annealing methods. The structures of the films were characterized with X-ray diffraction (XRD), Raman spectroscopy and scanning electron microscopy (SEM) techniques. It was shown that the 700 ±C-annealed LiCo0.8M0.2O2 has an @-NaFeO2-like layered structure. All-solid-state thin-film batteries (TFBs) were fabricated with these films as the cathode and their electrochemical performances were evaluated. It was found that doping of electrochemically active Ni and inactive Zr has different effects on the structural and electrochemical properties of the LiCoO2 cathode films. Ni doping increases the discharge capacity of the film while Zr doping improves its cycling stability. 相似文献
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采用射频(RF)磁控溅射技术制备了用于全固态薄膜锂电池的非晶态和多晶LiCoO2阴极薄膜,利用XRD和SEM研究了沉积温度对LiCoO2薄膜结构和形貌的影响,并研究了高温退火后薄膜的电化学性能.研究结果表明,随著基片温度的不同,薄膜成分、表面形貌以及电化学行为有明显差异.室温沉积的薄膜很难消除薄膜中Li2CO3的影响,经过高温退火处理后也无法形成有效的多晶LiCoO2薄膜,而150℃沉积的薄膜经过高温退火后形成了有利于锂离子嵌入的多晶LiCoO2结构,薄膜显示出了较好的电化学性能. 相似文献
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在对经激光预冷却的原子进行俘获的光学偶极阱中,魔术波长光学偶极阱可以消除所关心的两原子态间跃迁的差分光频移,使得光子在原子态间的跃迁频率与自由空间相同,对于提高实验重复率、减弱原子的退相干具有重要意义,使其在冷原子物理、量子光学、精密测量等领域已成为越来越重要的技术手段.本文基于多能级模型理论计算了耦合铯原子D2线的6S1/2基态和6P3/2激发态对光阱激光波长(800—1000 nm)依赖的动态电极化率,得到了俘获基态和激发态的光阱激光的魔术波长.由于角动量大于0.5的原子态的极化率对极化角非常敏感,本文以线偏振光阱激光为例,讨论并分析了魔术波长与相应的魔术极化率对极化角的依赖关系,得到了魔术极化角为54.7°以及该角度下的魔术波长分别为886.4315 nm与934.0641 nm,进一步分析了这两种情况下魔术条件的鲁棒性与实验操作的可行性. 相似文献