随着新能源技术的发展，锂离子电池的能量密度，循环稳定性及安全性受到空前关注。NCA正极材料具有高比容量的特点，但是热稳定性差，与液态电解液配合易发生副反应，造成热失控。开发新型固体电解质是解决NCA正极锂离子电池安全性的本质。Li2S-GeS2-P2S5具有较高的Li+电导率。为解决硫化物电解质与氧化物正极界面阻抗大，本研究拟采用磁控溅射、真空蒸镀及喷涂等手段对电解质基片进行表面修饰，探索界面离子传输机理和界面阻抗变化机制。引入电子绝缘氧化物，不仅可以降低界面阻抗，而且还可提高固-固相之间的连接，缓冲固体颗粒体积变化。构筑NCA/MO（M=Ce，Si…）@Li2S-GeS2-P2S5/Li全固体电池，系统研究界面阻抗变化、结构变化、形貌变化、元素组成变化与电化学性能之间的关系。为全固体锂离子电池的发展提供实验和理论基础。

With the development of new energy technologies, lithium ion batteries get wider and wider application in the world due to its energy density, cycle stability and safety. NCA cathode material has a high specific capacity, but the thermal stability is poor. NCA is easy to react with the liquid electrolyte with side effects, resulting in thermal runaway. Development of new solid electrolyte is the essence of the safety of NCA positive lithium ion battery. Li2S-GeS2-P2S5 has a high Li+ conductivity. The interfacial potential difference between the sulfide electrolyte and the oxide cathode is large, resulting in large interface resistance. In order to solve the problem, in this study, the surface modification of the electrolyte substrate is proposed by means of magnetron sputtering, vacuum deposition and spraying. Explore the mechanism of interface ion transport and interface impedance change. Introduction of electronic insulating oxide, not only can reduce the interface impedance, but also can improve the so link between solid-solid phases, buffer the solid particle volume changes. The NCA/MO (M = Ce, Si ...)@Li2S-GeS2-P2S5/Li solid-state battery was used to study the relationship between the change of the interface impedance, structure, morphology, element composition and the electrochemical performance. Our efforts will provide experimental and theoretical basis for the development of solid lithium ion batteries.