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Laser annealing of textured thin film cathode material for lithium ion batteries

机译:锂离子电池纹理薄膜阴极材料的激光退火

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The material development for advanced lithium ion batteries plays an important role in future mobile applications and energy storage systems. It is assumed that electrode materials made of nano-composited materials will improve battery lifetime and will lead to an enhancement of lithium diffusion and thus improve battery capacity and cyclability. Lithium cobalt oxide (LiCoO_2) is commonly used as a cathode material. Thin films of this electrode material were synthesized by non-reactive r.f. magnetron sputtering of LiCoO_2 targets on silicon or stainless steel substrates. For the formation of the high temperature phase of LiCoO_2 (HT-LiCoO_2), which exhibits good electrochemical performance with a specific capacity of 140 mAh/g and high capacity retention, a subsequent annealing treatment is necessary.rnFor this purpose laser annealing of thin film LiCoO_2 was investigated in detail and compared to conventional furnace annealing. A high power diode laser system operating at a wavelength of 940 nm with an integrated pyrometer for temperature control was used. Different temperatures (between 200℃ and 700℃) for the laser structured and unstructured thin films were applied.rnThe effects of laser treatment on the LiCoO_2 thin films studied with Raman spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction to determine their stoichiometry and crystallinity. The development of HT-LiCoO_2 and also the formation of a CO_3O_4 phase were discussed. The electrochemical properties of the manufactured films were investigated via electrochemical cycling against a lithium anode.
机译:先进锂离子电池的材料开发在未来的移动应用和能量存储系统中起着重要作用。假设由纳米复合材料制成的电极材料将改善电池寿命,并导致锂扩散增强,从而改善电池容量和循环性。钴酸锂(LiCoO_2)通常用作正极材料。该电极材料的薄膜是通过非反应性射频合成的。 LiCoO_2靶的磁控溅射在硅或不锈钢基板上。为了形成表现出良好的电化学性能,比容量为140 mAh / g和高容量保持率的LiCoO_2(HT-LiCoO_2)高温相,必须进行后续退火处理。rn为此目的,对薄膜进行激光退火对LiCoO_2进行了详细研究,并将其与常规炉退火进行了比较。使用在940 nm波长下工作的高功率二极管激光系统,并带有集成的高温计以进行温度控制。应用了激光结构化和非结构化薄膜的不同温度(200℃至700℃)。rn激光处理对拉曼光谱,X射线光电子能谱和X射线衍射研究LiCoO_2薄膜的化学计量的影响和结晶度。讨论了HT-LiCoO_2的发展以及CO_3O_4相的形成。通过针对锂阳极的电化学循环研究了所制造的膜的电化学性质。

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