全固态薄膜锂电池的原位构筑及其固-固 界面特性研究

       近年来，为了满足物联网（IoT）、微芯片、植入式医疗设备等在低能 领域的供电需求，对开发出可集成的微型储能器件提出了新的要求。相较 于传统液态电解液基锂电池，全固态薄膜锂电池的全部结构为固态薄膜， 可设计成不同形状和大小，是电子产品小型化、集成化、智能化的理想微 储能器件。现阶段薄膜锂电池发展仍处于初步阶段，要实现产业化应用， 还有诸多关键技术难题和科学问题亟需解决。

       全固态薄膜锂电池面临的固体电解质中间相的成核、锂电极枝晶化、 电化学降解等关键问题都与固-固界面的不稳定性有直接关联，亟需人们从 微观角度深入认识各表界面的特性。此外，目前薄膜全电池在制备过程中 需要反复开腔，不可避免地存在碳氢化合物、反应层杂质的引入以及表面 结构变性等问题，需要开发原位一体化薄膜沉积技术。

       本论文以 Li-La-Zr-Ta-O（LLZT O）基固体电解质为研究对象，采用 薄膜技术结合真空互联技术，原位构建不同构型的全固态薄膜锂电池。采 取正交实验法，结合 XRD、SEM、EDS、AFM 与 XPS 等手段确定各膜层 的最佳工艺参数。在此基础上，利用大科学装置中子反射技术，辅以 X 射 线反射对薄膜全电池固-固界面特性进行深入研究。本课题创新设计制备出 适于中子反射表征的薄膜型锂离子电池，并建立界面无损表征和解析的新 方法，为实现更加精准、有效的界面修饰提供理论基础和实验依据。

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