三维石墨烯稳定无机纳米量子点的导向组装及高效储锂性能研究

负极材料作为锂离子电池的重要组成部分，其性能的提升对整个锂离子电池性能的改进起着关键作用。然而目前商品化的石墨化碳，其理论比容量仅为372 mAh/g，远不能满足当前高能耗领域的应用需求，故设计和开发一种高比功率和高比能量的锂离子电池负极材料是当前所亟需。本项目拟提出以新型高导电的三维石墨烯来稳定高容量无机纳米量子点（直径<5 nm）的新策略，制备三维石墨烯-无机纳米量子点复合材料。利用新型三维石墨烯具有高比表面积和良好的纳米孔洞的优势，将高载量的无机纳米量子点均匀分散并导向组装嵌入到该载体的纳米孔洞内，融合无机纳米量子点具有超小尺寸、高比表面积及表面原子比的特点，设计制备一系列高比功率和高比能量的锂离子电池负极材料。研究三维石墨烯稳定无机纳米量子点的导向组装机理，探讨三维石墨烯和无机量子点的协同效应，揭示复合材料的结构、组成与电化学性能之间的联系，为高效锂离子电池的实际应用奠定理论基础。

Anode material is one of the key components for lithium ion batteries (LIBs). Its improvement plays a key major role in improving performance of LIBs. However, the theoretical specific capacity of commercial graphitized carbon materials is only 372 mAh/g, which is far beyond the requirements of high energy consuming fields. Therefore, it is essential to design and develop an anode material with high-power and high-energy density for LIBs. In this project, we will explore an efficient strategy to prepare a novel three-dimensional (3D) graphene-inorganic quantum dots (IQDs) nanocomposite by using 3D graphene with high conductivity to stabilize the high-capacity IQDs (Diameter <5 nm). By taking advantages of the 3D graphene with high specific surface area and favorable nano-pore structures, a substantial amount of IQDs can be effectively dispersed and embed in the nanopores of 3D graphene. Combining with such characteristics of IQDs as ultrasmall nano size, high specific surface area and high surface-to-atom ratio, a series of anode materials with high-power and high-energy density for LIBs will thus be designed and fabricated. Through investigating the mechanism for the directed assembly of IQDs stabilized by 3D graphene, discussing the synergistic effect between 3D graphene and IQDs, and revealing the relationships between structure, composition and their electrochemical performance, we will lay a theoretical foundation for the application of high-efficiency LIBs in practice.