金属锂被誉为锂基电池负极材料中的“圣杯”，但充放电过程中产生的锂枝晶制约了其发展。为此，本项目提出构筑磁性三维复合集流体的学术思路，拟利用微磁场和三维集流体的协同作用解决锂枝晶问题，即通过集流体内金属永磁纳米颗粒产生的磁流体力学效应、磁化力作用等调控金属锂的剥离/沉积行为、细化组织、减缓或消除锂枝晶生长；利用三维结构集流体增大比表面积，减小局部电流密度抑制锂枝晶生长并提供膨胀空间等，以获得优异的综合性能。项目研究内容包括：磁性三维金属锂负极集流体的物相与显微结构的调控规律；研究新体系内电荷和锂离子的扩散和传输规律,结合微磁学相关理论计算，阐明物相和结构特征、电化学与磁学性能等三者之间的关联特性，揭示微磁场对金属锂剥离/沉积过程的作用机制，建立微磁场与三维结构集流体的协同作用理论模型。本项目研究思路新颖，将丰富金属锂负极材料的理论研究，同时对新型锂基电池材料的开发与应用具有显著的实际意义。

Lithium metal is regarded as the "holy grail" anode material for lithium based batteries, but the problem of lithium dendrite produced during charge and discharge process restricts its further development. This project proposed a novel method of synergetic effects between micro-magnetic field and three-dimensional structure by building a magnetic three-dimensional composite current collector to solving this problem. The stripping/plating behavior of lithium metal will be controlled by magnetohydrodynamic (MHD) effect and magnetizing force produced by the metal permanent magnetic nanoparticles in the current collector, which lead to the formation of fine grains and elimination of lithium dendrites. Furthermore, the three-dimensional structure with large specific surface area will reduce the local current density to inhibit the growth of lithium dendrite, and provide expansion space. The research contents of the project include: the regulation laws of phase and microstructure of the magnetic three-dimensional lithium metal current collector; the diffusion and transmission laws of charge and lithium ion in this new system; the correlation characteristics between phase and structure, electrochemistry and magnetic properties; the relevant calculations about micro-magnetism; the mechanism of micro-magnetic field affecting the lithium metal stripping/plating process; the theoretical model of synergetic effects between micro-magnetic field and three-dimensional current collector. The research idea in the project is novel and feasible, which will enrich the theoretical research of lithium metal anode materials, and it is significant for the development and application of new lithium based battery materials.