萘二酰亚胺类锂离子电池有机正极材料的合成及储能机理研究  

Study on Synthesis and Storage Mechanism of Naphthalene Diamide-Based Organic Cathode Materials for Lithium-Ion Battery

作　　者：罗河伟 白浩楠 马贺 Luo Hewei;Bai Haonan;Ma He(College of New Energy,Zhengzhou University of Light Industry,Zhengzhou,450002)

机构地区：[1]郑州轻工业大学新能源学院,郑州450002

出　　处：《化学通报》2024年第7期838-844,769,共8页Chemistry

基　　金：国家自然科学基金项目(22075255);河南省科技攻关项目(242102240007)资助。

摘　　要：有机电极材料由于其高比容量、结构灵活和环境友好等优点逐渐成为研究的热点。通过在萘二酰亚胺(NDI)核位扩展吡嗪基团,合成了一种新型的多电子反应有机电极材料NDI-N,该分子具有良好的晶型以及电化学稳定性。电化学测试表明该分子的初始放电比容量达到155mAh/g,以0.2C的电流密度循环500圈之后仍有97%的容量保持率;非原位核磁氢谱测试和理论计算等研究发现,NDI-N和锂离子的反应首先发生在吡嗪结构单元的C=N双键上,其次发生在NDI结构的C=O双键上,这一机理的阐明为NDI核位扩展的多电子有机电极材料研究提供了一种可行方案。Organic electrode materials have become increasingly important due to their high specific capacity,flexible structure and environmental friendliness.In this paper,a new type of multi-electron reaction organic electrode material NDI-N was synthesized by extending the pyrazine group at the nuclear site of naphthalimide(NDI),which exhibits good crystal structure and electrochemical stability.Electrochemical tests showed that the initial discharge specific capacity of NDI-N reached 155 mAh·g^(-1),and there was still a capacity retention rate of 97%after 500 cycles at a current density of 0.2 C.Through ex-situ ^(1)H NMR tests and theoretical calculations,it was found that the reaction between NDI-N and lithium ions first occurs on the C=N double bond in pyrazine unit,followed by the C=O double bond in NDI structure.The elucidation of this mechanism provides a feasible solution for the study of core-expand NDI multi-electron organic electrode materials.

关 键 词：锂离子电池 萘二酰亚胺 有机小分子 正极材料 

分 类 号：TM912[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]