自悬浮聚苯胺负载纳米四氧化三铁作为高性能锂离子电池负极材料的制备及性能研究

项目名称： 自悬浮聚苯胺负载纳米四氧化三铁作为高性能锂离子电池负极材料的制备及性能研究

项目编号： No.51503159

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： 黄静

作者单位： 武汉纺织大学

项目金额： 20万元

中文摘要： 通过改变有机长链离子液体的种类、链长及掺杂技术，研究自悬浮聚苯胺的化学组成、微观形态和流变特性，揭示自悬浮聚苯胺的流动机制，并探讨不同制备方法对自悬浮聚苯胺的热稳定性和导电性的影响。将自悬浮聚苯胺用作锂离子电池导电粘结剂，考察其剥离强度、溶胀性能和表面形貌等，同时采用化学共沉淀法使纳米四氧化三铁均匀沉积在自悬浮聚苯胺的表面，制备出具有超高重量能量比和优异循环性能的电极材料。通过恒流充放电、循环伏安、交流阻抗和导电率测试，研究自悬浮聚苯胺负载纳米四氧化三铁负极材料的电化学性能。洞悉聚苯胺/四氧化三铁纳米复合材料在不同充放电状态下的结构变化、自修复功能和储锂机制以及与电化学性能之间的关系，建立复合材料的容量和寿命的调控技术。本项目将为导电高分子和高比容量金属氧化物的结构设计、制备及应用提供科学理论和实用技术。

中文关键词： 自悬浮聚苯胺；导电聚合物；电化学性能；锂离子电池

英文摘要： By changing the dosage, chain length and doping method, the chemical composition, morphological microstructure and rheological property of self-suspended PANI will be investigated to shed lights on its flow mechanism, and to discuss the effect of different preparation methods on its thermostability and conductivity. The physical properties such as peel tests, swelling properties and surface morphologies are tested by using self-suspended PANI as conductivity binder in lithium ion battery. Then the anode composite material, in which nano-sized Fe3O4 are deposited uniformity onto the surface of self-suspended PANI, are prepared through chemical coprecipitation method, rendering a superior weight-to-energy ratio and excellent cycle performance. Galvanostatic method, AC impedance and conductivity testing are carried out to measure the electrochemical properties of self-suspended PANI loaded nano-sized Fe3O4 as lithium ion battery anode materials. The relationships between electrochemical properties and lithium storage mechanisms as well as the structure changes and self-repair capacity of PANI/Fe3O4 nanocomposite at various states of charging and discharging processes will be investigated to establish the control technology for the capacity and lifespan of the nanocomposite. This project will provide both theoretical and technical supports for the structure design, preparation and application toward conducting polymer and metal oxide with high specific capacity.

英文关键词： Self-suspended polyaniline;Conducting polymer;Electrochemical properties;Lithium ion battery