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
罗河伟 1白浩楠 1马贺1
作者信息
- 1. 郑州轻工业大学新能源学院 郑州 450002
- 折叠
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.
Abstract
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 1H 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Key words
Lithium ion battery/Naphthalene diimide/Organic small molecule/Cathode material引用本文复制引用
基金项目
国家自然科学基金项目(22075255)
河南省科技攻关项目(242102240007)
出版年
2024
NETL
NSTL
万方数据