无机固态电解质界面改性技术研究进展

Progress in interfacial modification of inorganic solid electrolytes

全固态锂离子电池,因其能量密度和安全性的优势而受到广泛关注,固态电解质作为全固态电池的核心部件对其工作性能具有至关重要的影响。当前研究较为成熟的固态电解质体系包括氧化物、硫化物和聚合物三种,其中氧化物固体电解质的能量密度、稳定性和循环寿命等性能较好,是较为理想的固态电解质材料,但其与电极间存在的严重的界面接触问题束缚了固态电池的大规模应用。目前针对改善不同类型固态电解质界面问题的研究较多,综述了近几年报道的无机固态电解质与电极间的界面问题的前沿研究,系统归纳了几类主要的界面改性方法,着重对复合正极、界面处理工艺优化、引入界面层以及复合电解质等研究方法进行了介绍与应用前景展望。

All-solid-state lithium-ion battery has attracted wide attention due to its advantages of energy density and safety.As the core component of all-solid-state battery,solid-state electrolyte has a crucial impact on its performance.At present,the main solid electrolyte systems include oxides,sulfides and polymers,among which oxide solid electrolytes are relatively ideal solid electrolyte material with good performance such as energy density,stability and cycle life.However,serious interfaces contact between electrolyte and electrodes restrict the large-scale application of solid battery.Many researches focus on improving the contact of interfaces with different types of solid electrolytes.In this paper,the cutting-edge researches on the interfaces between inorganic solid electrolytes and electrodes reported in recent years are reviewed,and several main interfacial modification methods are systematically summarized.The research methods of composite positive electrode,interface processing technology optimization,interface layer introduction and composite electrolyte are introduced and their application prospects are discussed.