新型多孔碳-二硫化硒纳米复合材料的可控制备与储锂机制

项目名称： 新型多孔碳-二硫化硒纳米复合材料的可控制备与储锂机制

项目编号： No.51502226

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 周亮

作者单位： 武汉理工大学

项目金额： 20万元

中文摘要： 高性能、低成本锂硫化硒电池的开发是新能源技术和纳米技术的交叉和前沿。针对现有锂硫化硒电池导电性低、活性物质易溶出以及嵌锂过程中的体积膨胀等问题，本项目拟设计新型多孔碳材料负载活性客体二硫化硒，提高二硫化硒的导电性，抑制活性组分溶出，缓解材料的体积膨胀，从而提高锂硫化硒电池的电化学性能。通过溶胶-凝胶法和喷雾干燥法制备新型的、具有超大孔容的、微观结构和表面功能化可控的多孔碳材料，并以此为载体填充不同含量的电化学活性客体二硫化硒；系统研究多孔碳材料的结构、孔径大小、表面功能化、二硫化硒负载量等结构参数对锂硫化硒电池电化学性能的影响，探索材料结构与物性之间的内在联系，为新型锂硫化硒电池的研发奠定科学基础。

中文关键词： 纳米复合材料；多孔碳；空心结构；储锂；锂硫化硒电池

英文摘要： The development of high-performance, low-cost lithium-selenium sulfide (Li-SexSy) batteries is an emerging research frontier in energy storage and nanotechnology. Current Li-SexSy batteries suffer from rapid capacity decay which is caused by multiple mechanisms, e.g. low conductivity, polyselenides/polysulfides dissolution, and large volume expansion during lithiation. This project aims to tackle the key challenges of Li-SexSy batteries. Novel porous carbon materials will be designed for SeS2 hosting to enhance its conductivity, suppress its dissolution in the electrolyte, and accommodate its volume expansion. Specifically, the sol-gel method and spray drying method will be utilised to prepare novel porous carbon materials with ultra-high pore volume, tailored structure and surface chemistry. Different amounts of SeS2 will be loaded into the porous carbon matrix. The effects of structure, pore size, surface chemistry, and SeS2 loading amount on the electrochemical performances will be systematically studied. The fundamental understanding on structure-electrochemical performance correlation generated from this study will advance the development of Li-SexSy batteries.

英文关键词： Nanocomposites;Porous Carbon;Hollow Structure;Lithium Storage;Lithium-Selenium Sulfide Battery