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首页> 外文期刊>RSC Advances >Electrochemical and structural characterization of lithiation in spray deposited ordered mesoporous titania as an anode for Li ion batteries
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Electrochemical and structural characterization of lithiation in spray deposited ordered mesoporous titania as an anode for Li ion batteries

机译：喷雾沉积有序介孔二氧化钛中锂化的电化学和结构表征作为Li离子电池的阳极

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Ordered mesoporous titania, prepared via low-temperature spray deposition, was examined as an anode material for lithium ion batteries. The material exhibits an exceptionally high electrochemical capacity of 680 mA h g ~(?1) during the first discharge, which rapidly decreases over the following cycles. The capacity stabilizes at around 170 mA h g ~(?1) after 50 cycles and the material delivers 83 mA h g ~(?1) at high charge/discharge rates (10C). A combination of electrochemical and structural characterization techniques were used to study the charge/discharge behavior of the material and the origin of the irreversible capacity. To determine the effect of cycling on the structure of the material, X-ray absorption spectroscopy (XAS) and energy filtered TEM were carried out on pristine and cycled samples in intercalated and deintercalated states. Titanium K-edge XAS measurements showed that intercalated lithium affects the NEXAFS region. By comparing peak intensity ratios, we propose a method to quantify the amount of lithium inserted into the titania structure and to differentiate between lithium bound in close proximity to titanium, and lithium bound further away from titanium. Additionally, we suggest that the irreversible loss in capacity is due to the formation of phases that are stable, and thereby electrochemically inactive, over the electrochemical cycling conditions applied.
机译：通过低温喷涂沉积制备的订购介孔二氧化亚亚菊酯作为锂离子电池的阳极材料。在第一次放电期间，该材料在第一次放电期间具有680mA H G〜（α1）的极高电化学能力，这在以下循环中迅速降低。在50次循环后，该容量在约170mA H g〜（α1）下稳定，并且该材料以高充电/放电速率（10c）以83m​​A H g〜（α1）提供83mA H g〜（α1）。电化学和结构表征技术的组合用于研究材料的充电/放电行为和不可逆容量的起源。为了确定循环对材料结构的影响，在嵌入和脱硝的状态下对丙氨酸和循环样品进行X射线吸收光谱（XAs）和能量过滤TEM。钛K-Edge XAS测量显示插层锂会影响NexaFS区域。通过比较峰强度比，我们提出了一种方法以量化插入二氧化钛结构的锂量，并在钛接近近距离的锂与钛的锂结合。此外，我们表明容量的不可逆损失是由于形成稳定的相的相，从而在施加的电化学循环条件下进行电化学无效。

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