锂-空气电池阴极双功能催化剂的制备及其电化学性能研究

项目名称： 锂-空气电池阴极双功能催化剂的制备及其电化学性能研究

项目编号： No.21206101

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 化学工程及工业化学

项目作者： 杨瑞枝

作者单位： 苏州大学

项目金额： 25万元

中文摘要： 寻求对氧气电化学还原反应（ORR）和氧气析出反应（OER）兼具高催化活性的双功能催化剂，是解决二次锂－空气电池充放电极化大、循环性差等问题的重要途径。本项目提出制备分级多孔CoxM3-xO4 /C(M=Fe, Mn)纳米复合双功能催化剂作为二次锂－空气电池阴极的催化剂。通过调控材料的组成、物相和形貌等调控其对ORR和OER的催化活性；通过分级多孔结构的构筑，优化电极结构，从而获得在锂－空气电池中具有应用前景的新型双功能催化材料。以原位X-射线衍射（XRD）和原位X-射线吸收谱（XAS）研究催化剂的微观结构在锂－空气电池充放电过程中的变化；以原位拉曼光谱分析充放电过程中ORR和OER的中间产物，阐明CoxM3-xO4 /C(M=Fe, Mn)对ORR和OER的催化机理，为设计、制备用于锂－空气电池的高催化活性双功能催化剂提供实验和理论基础。

中文关键词： 锂-空气电池；CoxM3-xO4/C（M=Fe;Mn）复合材料；双功能催化剂；氧气还原反应；氧气析出反应

英文摘要： The high polarization during the charge/discharge process and the bad cycling performance are the critical challenges that limit the practical use of the secondary lithium-air batteries. It is vital to develop bi-functional catalysts with high catalytic activity for both the oxygen reduction reaction(ORR) and the oxygen evolution reaction(OER) in lithium-air batteries.Hierarchically porous CoxM3-Xo4/C(M=Fe,Mn)bi-functional composite catalysts for the cathode of lithium-air batteries are proposed in this project.The catalytic activity of the catalysts for the ORR and the OER will be improved by controlling the composition、phase and the morphology of the catalysts.The structure of the electrode will be modified by construction of the hierarchically pores. A promising novel bi-functional catalysts are expected for the lithium-air batteries based on the improvement of the catalytic activity of the catalysts and the construction of the electrode.The structure change of the catalysts during the charge/discharge will be studied by in-situ X-ray diffraction and in-situ X-ray absorption spectroscopy. The intermediates of the ORR and the OER during the charge/discharge will be studied by in-situ Raman.The mechanism of the ORR and the OER on these catalysts will be eluciated based on these studies. A solid experimental and

英文关键词： Li-air battery；CoxM3-xO4/C（M=Fe;Mn）composite；Bi-functional catalysts；Oxygen reduction reaction；Oxygen evolution reaction