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摘要
粘结剂作为电极材料中不可或缺的部分,具有固定活性物质、增强电极稳定性等作用。将4,4′-氧双邻苯二甲酸酐(ODPA)与2,2′-双[4-(4-氨基苯氧基苯基)]丙烷二胺(BAPP)通过缩聚反应得到聚酰胺酸粘结剂PAA-1,加入3,5-二氨基苯甲酸(DABA)进行共聚得到粘结剂PAA-2,将2种粘结剂分别与硅碳纳米材料、导电剂混合涂覆制作成锂离子电池负极片。通过傅里叶变换红外光谱仪、热重分析仪对粘接剂的结构和热稳定性进行分析,通过扫描电子显微镜观察含不同粘接剂的硅碳电极的形貌并测试了电极的电化学性能。结果表明:与商业粘结剂聚偏氟乙烯(PVDF)相比,PAA-1和PAA-2粘结剂与硅碳负极形成良好的交联网络结构,具备更好的粘结性能;在0.5C下充放电循环75圈后,PAA-1@Si/C和PAA-2@Si/C电极比容量分别为423.1mAh/g和437.7mAh/g,容量保持率分别为96.6%和99.8%,在5C下可逆比容量为284mAh/g,循环后形成了稳定均匀的固态电解质膜,为进一步开发硅碳负极用新型粘结剂提供了参考。
Abstract
As an indispensable part of electrode materials,binders have the functions of fixing active substance and enhancing electrode stability.In this study,polyamide acid binders PAA-1 were synthesized via polycondensation of 4,4′-oxydiphthalic anhydride (ODPA) with 2,2-bis[4-(4-aminophenoxy)phenyl]propane diamine (BAPP),followed by copolymerization with 3,5-diaminobenzoic acid (DABA) to obtain PAA-2.These two types of binders were then respectively mixed with silicon-carbon nanomaterials and conductive agents to fabricate lithium-ion battery anode sheets.The structural characteristics and thermal stability of the binders were analyzed by Fourier transform infrared spectroscopy and thermogravimetric analysis.The morphology of silicon-carbon electrodes containing different binders was observed through scanning electron microscopy,and their electrochemical performance was systematically evaluated.The results indicated that compared with commercial polyvinylidene fluoride (PVDF) binder,both PAA-1 and PAA-2 formed superior cross-linked network structures with silicon-carbon anodes,exhibiting enhanced binding capabilities.After 75 charge-discharge cycles at 0.5C,PAA-1@Si/C and PAA-2@Si/C demonstrated specific capacities of 423.1mAh/g and 437.7mAh/g,respectively,with capacity retention rates of 96.6% and 99.8%.At 5C,they maintained a reversible specific capacity of 284mAh/g.Post-cycling analysis revealed the formation of stable and homogeneous solid electrolyte interphase (SEI) films,providing valuable insights for the further development of novel binders for silicon-carbon anodes.
关键词
聚酰胺酸
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锂离子电池
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硅碳负极
/
粘结剂
Key words
polyamide acid
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lithium-ion batteries
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silicon carbon anode
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binder
锂离子电池硅碳负极用聚酰胺酸粘结剂的制备及其性能研究[J].
化工新型材料, 2025, 53(10): 201-206 DOI:10.19817/j.cnki.issn1006-3536.2025.10.009
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基金资助
国家自然科学基金(52003032);重庆市教育委员会科学技术研究计划青年项目(KJQN202401113);重庆理工大学研究生创新项目(gzlcx20233009)
