自支撑聚吡咙基碳纤维负极材料的制备及其电化学性能  

Preparation and electrochemical properties of self-supporting polypyrrilone-based carbon fiber anode materials

作　　者：徐振凯 马鸣 蔺多佳 刘航 张剑峰 夏鑫[1] XU Zhenkai;MA Ming;LIN Duojia;LIU Hang;ZHANG Jianfeng;XIA Xin(College of Textile and Clothing,Xinjiang University,Urumqi,Xinjiang 830017,China)

机构地区：[1]新疆大学纺织与服装学院,新疆乌鲁木齐830017

出　　处：《纺织学报》2024年第6期23-31,共9页Journal of Textile Research

基　　金：国家自然科学基金项目(52263024);新疆特种纺织材料的开发与应用研究天山创新团队项目(2017D14002);天山青年计划项目(2020Q003);新疆维吾尔自治区研究生教育教学改革项目(XJ2022GY07)。

摘　　要：为探究聚吡咙基碳纤维作为自支撑负极材料的电化学性能,将聚羧酸铵盐(PCAAS)和不同质量分数的聚氧乙烯(PEO)混合溶液通过静电纺丝技术制备成前驱体纳米纤维,在500℃下亚胺化、环化形成聚吡咙(BBB)纤维,800℃下炭化形成聚吡咙基碳纤维(BCF),将BCF作为负极材料装配成锂离子电池,探究不同质量分数PEO对BCF形貌结构和电化学性能的影响。结果表明:当PEO质量分数为6%时,前驱体纳米纤维表面光滑且直径均匀,炭化后的BCF直径减小了24.2%;聚吡咙作为芳杂环聚合物有密集的碳链,经炭化后含碳量高达97.5%;且咪唑和+吡咯的残留N导致较多无序碳的产生,N上的孤对电子作为载体促进电子迁移,并为Li提供了更多活性位点;在恒流充放电循环中,50 mA/g的电流密度下循环100圈后仍具有422.3 mA·h/g的放电比容量。Objective As a flexible anode material,carbon nanofibers membrane is used in lithium-ion batteries,which has the advantages of high electron transfer rate and large electrolyte contact area.The search for novel carbon fibers precursors to prepare carbon fibers electrodes with good performance for flexible high-performance lithium-ion batteries calls for further research.Being an aromatic heterocyclic polymer,polypyrrilone(BBB)has a high carbon residue rate after carbonization,and is a preferred material as a precursor to new carbon fibers.Method In order to investigate the electrochemical performance of polypyrrilone carbon fibers as self-supported anode materials,a mixture of polycarboxylic acid ammonium salt(PCAAS)and different mass fractions of poly(ethylene oxide)(PEO)was prepared into precursor nanofibers by electrostatic spinning technique.The precursor nanofibers were imidated and cyclized to form polypyrrilone fibers at 500℃,and then charred at 800℃to form polypyrrilone carbon fibers(BCF),and BCF was assembled into lithium-ion batteries as an anode material,to investigate the morphology and electrochemical performance of BCF with different mass fractions of PEO,which were denoted as BCF-3,BCF-6,and BCF-9,respectively,based on the mass fraction of PEOs.BCF was used as an anode material for lithium-ion batteries,and the morphology and electrochemical properties of BCF were investigated under different mass fractions of PEO.Results The surface of the precursor fibers is smooth,and the fiber diameter increases significantly when PEO concentration increased.It was found that the diameters of BCF-3,BCF-6 and BCF-9 are 31.2%,24.2%and 3.2%lower than their precursors,respectively,and the decrease in fiber diameter was due to the pyrolysis of PEO as a sacrificial template.In addition,the fiber agglomeration of BCF-6 precursors decreased after carbonization.The FT-IR spectra and the XPS spectra showed that the residue of pyrrole N and imidazole N was present in all three samples,while the residual N in BCF-6 was

关 键 词：静电纺丝 聚吡咙 碳纳米纤维 柔性自支撑 电化学性能 负极材料 

分 类 号：TQ152[化学工程—电化学工业] O632.6[理学—高分子化学]