三维石墨烯载无机纳米颗粒的制备及其储锂性能研究

项目名称： 三维石墨烯载无机纳米颗粒的制备及其储锂性能研究

项目编号： No.21471005

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 黄家锐

作者单位： 安徽师范大学

项目金额： 80万元

中文摘要： 锂离子电池由于其能量密度高、寿命长、安全性好和绿色环保等优点在便携式电子设备、动力电池等方面均有重要应用。为了满足高能量电源的需求，探索高容量、长寿命的新型锂离子电池负极材料是提高锂离子电池性能的一个重要方面。本项目提出利用氧化石墨烯之间的化学键合作用交联组装制备具有孔道结构和较大内部空间的三维结构石墨烯（3D石墨烯），结合浸渍法构筑出无机纳米颗粒/3D石墨烯复合材料；此外，拟利用带正电荷的无机纳米颗粒与带负电荷的氧化石墨烯直接复合组装构筑无机纳米颗粒/3D石墨烯复合材料。该新颖结构有望显著减缓负极活性材料在充放电过程中的体积效应，同时促进电子传递和锂离子快速脱嵌。研究多次充放电后负极材料微结构的变化，揭示无机纳米颗粒/3D石墨烯的微结构及其储锂性能之间的内在关联，发展出充放电容量大、循环寿命长和功率密度大的锂离子电池负极材料。

中文关键词： 自组装；石墨烯；无机功能材料；锂离子电池；构效关系

英文摘要： Lithium ion batteries (LIBs) are promising power sources for a wide range of applications, such as portable electronic devices and power battery because of their high energy density, long cycle life and green environmental protection etc. In order to meet the requirements of high energy power, exploring a high capacity, long life novel type of lithium ion battery anode material is an important aspect to improve the performance of lithium ion batteries. This project proposes the preparation of three-dimensional graphene (3D graphene) with channel structure and large inner space by self-assembly method using the chemical bonds cooperation between the graphene oxides, combining with the impregnation method to build inorganic nanoparticles/3D graphene composites. Furthermore, the construction of inorganic nanoparticles/3D graphene composites are achieved using direct recombination between inorganic nanoparticles with positive charge and graphene oxide with negative charge. The special novel structure of inorganic nanoparticles/3D graphene is expected to obviously accommodate the inorganic nanoparticles volume change during the charging (lithiation)-discharging (delithiation) processes but also provides effective pathways for electron transport and fast lithiation-delithiation. We will study the microstructure change of anode materials after the charging and discharging processes, revealing the structure-activity relationship of lithium storage properties to the microstructure of inorganic nanoparticle/3D graphene, developing several kinds of high charge and discharge capacity, long cycle life and high energy density of lithium ion battery anode materials.

英文关键词： Self-assembly;Graphene;Inorganic functional material;Lithium ion batteries;Structure-activity relationship