摘要
为研究聚吡咯(PPy)含量对Fe_2O_3/PPy负极材料电化学性能的影响,以FeCl_2·4H_2O为Fe源,采用水热法合成Fe_2O_3纳米片,用原位聚合法合成不同PPy含量的Fe_2O_3/PPy复合材料,并通过X-射线衍射和扫描电子显微镜对合成的材料进行表征;将材料组装成扣式电池,采用恒流充放电、循环伏安法和交流阻抗测试进行电化学性能表征.结果表明:PPy的加入改善了Fe_2O_3的循环稳定性,其中PPy质量分数为5.0%的Fe_2O_3/5.0%PPy负极材料的循环性能最好,在200 mA/g的电流密度下,首次放电比容量为1 342.3 mA·h/g,首次库仑效率达到75.1%;经过100次循环,其放电比容量保持为487.4 mA·h/g,高于Fe_2O_3/2.5%PPy、Fe_2O_3/7.5%PPy和Fe_2O_3的放电比容量.
In order to study the effect of polypyrrole (PPy) content on the electrochemical properties of Fe2O3 /PPy anode electrode, Fe2O3 nanosheets were synthesized by hydrothermal method using FeCl2·4H2O as Fe source, and then Fe2O3 /PPy composites with different PPy content were synthesized by in situ polymerization. The synthesized materials were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM). The electrochemical characteristics of assembled coin-type cells were evaluated by galvanostatic charge-discharge, cyclic voltammetry and electrochemical impedance spectra. The results show that PPy improves the cycle stability of Fe2O3 and Fe2O3 /5.0% PPy has the best cyclic performance,which exhibites an initial discharge capacity of 1 342.3 mA·h/g at a current density of 200 mA/g and the first Coulomb efficiency is 75.1%. In the following cycles the specific capacity of Fe2O3 /PPy is 487.4 mA·h/g after 100 cycles, which is higher than that of Fe2O3 /2.5% PPy、Fe2O3 /7.5% PPy and pure Fe2O3.
作者
何声太
吴垚震
高海
HE Sheng-tai;WU Yao-zhen;GAO Hai(Tianjin Key Laboratory of Advanced Fibers and Energy Storage,Tianjin Polytechnic University,Tianjin 300387,China)
出处
《天津工业大学学报》
CAS
北大核心
2018年第6期55-59,共5页
Journal of Tiangong University
基金
国家重大科学研究计划资助项目(2012CB933301)
