“类石墨烯”结构的含锂多元氧化物纳米晶的制备及其电化学性能研究

项目名称： “类石墨烯”结构的含锂多元氧化物纳米晶的制备及其电化学性能研究

项目编号： No.51472271

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 刘军

作者单位： 中南大学

项目金额： 83万元

中文摘要： 二维类石墨烯纳米片结构的无机晶体材料，因其短的锂离子扩散路径、二维的载流子通道和良好的耐体积膨胀能力，成为了储锂材料研究的新热点。一些单分散的类石墨烯二元无机材料，比如MnO2，TiO2，CoO超薄纳米片，通过剥离成功制备，并表现出良好的储锂性能。但是，实践中广泛应用的电极活性材料，含锂多元氧化物（比如，LiCoO2，Li4Ti5O12，LiV3O8，LiMn2O4等）的二维类石墨烯纳米片结构的制备仍然是目前面临的难题。本课题以类石墨烯结构的二元氧化物纳米片为前驱体，先通过静电自组装和石墨烯层层复合，再加入锂离子，通过低温热处理合成类石墨烯结构的含锂多元氧化物纳米片/石墨烯三明治结构复合材料。这种将商品化的含锂多元氧化物与石墨烯层层复合的设计，提高了氧化物的导电性，抑制了体积膨胀，也提供了二维的载流子通道，对实现高性能的锂离子电池具有重要意义。

中文关键词： 锂离子电池；纳米复合材料；电化学性能；纳米晶；新能源材料

英文摘要： Two-dimensional graphene-like inorganic materials, because of the short lithium ion diffusion path, the two-dimensional carrier path and good resistance to volume expansion capacity compared with bulk materials, become a new hot research spot of the lithium storages. Some graphene-like dual inorganic materials, such as, MnO2,TiO2 and CoO ultrathin nanosheets, have been synthesized by peeling method, and exhibit good lithium storage performances. However, it is still the bottleneck that the preparation of graphene-like structure of lithium-containing multinary oxides (such as, LiCoO2, Li4Ti5O12, LiV3O8, LiNi0.5Mn1.5O4, etc.) widely used in practice. The project uses graphene-like dual inorganic oxide nanosheets as precursors, layer-by-layer assembles these oxide nanosheets and graphene nanosheets by electrostatic self-assembly method, then, adds the lithioum ions, and anneals them by low temperatures to synthsize sandwich structure of graphene-like lithium-containing multinary oxide nanosheets/graphene nanosheets. The way that layer-by-layer synthesis of lithium-containing multinary oxide nanosheets and graphene nanosheets, will improve the conductivity of the oxides, suppress the volume expasion while lithium inset, but also provide a two-dimensional carrier path, which will be important for achieving lithium ion batteries with high performances.

英文关键词： lithium ion batteries;nano-composites;electrochemical properties;nanocrystals;new energy materials