近年来，以YBCO为代表的第二代高温超导带材的研究取得了突破性进展，千米级带材已经研制成功，基于YBCO涂层导体的超导电力装置也已经展开设计和实验研究。然而，YBCO超导带材在平行场和垂直场下的超导性能差别很大，存在强烈的各向异性。并且YBCO涂层导体随外加磁场强度增大超导性能急剧下降，大大阻碍了其规模化应用。因此，提高YBCO涂层导体各向同性超导性能的研究不仅具有重大应用需求，同时对理解其磁通钉扎机理也具有重要理论意义。为此，本课题拟在前期工作的基础上，采用化学溶液法制备YBCO涂层导体,研究引入不同类型纳米缺陷对YBCO涂层导体超导性能的影响。通过系统分析临界电流密度（JC）与外加磁场角度、临界磁场强度和温度的依赖关系，理解各种缺陷在YBCO薄膜内部的磁通钉扎机制，建立数学模型。并在此基础上，优化工艺参数制备出临界电流高于1000A/cm、JC在垂直场和平行场相近的YBCO涂层导体。

Tremendous progress has been made in the scale-up of YBa2Cu3O7-x(YBCO) second-generation (2G) high temperature superconductors (HTS) in recent years. More than one kilometers of 2G HTS tape have now been successfully manufactured.And some of 2G HTS electrical power equipments have been designed and investigated.However, on the one hand, the superconducting properties of YBCO tapes in parallel field and vertical field is different. The anisotropy of YBCO coated conductors is very strong. On the other hand,the superconducting properties of YBCO coated conductors reduce drastically with the applied magnetic field increases. This limits the utility of high-temperature superconductors in electric power applications. Therefore, the enhancement of isotropic flux pinning of YBCO coated conductors is very important for commercialization application and comprehending the flux pinning mechanism of YBCO coated conductors.In this project, YBCO coated conductors will be prepared by chemical solution deposition. And the angular of magnetic field, magnetic field and temperature dependence of critical current density of YBCO films with different defects will be investigated. We will understand the flux pinning mechanism of YBCO films with various defects and establish mathematical model. And on this basis,we will combine different defects to enhance the isotropic critical current density of YBCO coated conductors. And the YBCO conducted conductors exceeding 1000 A cm−1 width at 77 K will be prepared.