Towards high performance polyimide cathode materials for lithium–organic batteries by regulating active-site density,accessibility,and reactivity  

作　　者：Jun Wang Haichao Liu Chunya Du Bing Liu Haoran Guan Yu Liu Shaowei Guan Zhenhua Sun Hongyan Yao 

机构地区：[1]National&Local Joint Engineering Laboratory for Synthesis Technology of High Performance Polymer,Key Laboratory of High Performance Plastics,Ministry of Education,College of Chemistry,Jilin University,Changchun 130012,China [2]State Key Lab of Supramolecular Structure and Materials,Jilin University,Changchun 130012,China [3]Shenyang National Laboratory for Materials Science Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [4]College of Sciences,Shenyang University of Chemical Technology,Shenyang 110142,China

出　　处：《eScience》2024年第4期110-119,共10页电化学与能源科学（英文）

基　　金：The authors thank the financial support from the National Natural Science Foundation of China(No.51903100);the Science and Technology Development Plan of Jilin Province,P.R.China(No.20210402060GH and 20230201138GX).

摘　　要：Organic carbonyl electrode materials offer promising prospects for future energy storage systems due to their high theoretical capacity,resource sustainability,and structural diversity.Although much progress has been made in the research of high-performance carbonyl electrode materials,systematic and in-depth studies on the underlying factors affecting their electrochemical properties are rather limited.Herein,five polyimides containing different types of diamine linkers are designed and synthesized as cathode materials for Li-ion batteries.First,the incorporation of carbonyl groups increases the active-site density in both conjugated and non-conjugated systems.Second,increased molecular rigidity can improve the accessibility of the active sites.Third,the introduction of the conjugated structure between two carbonyl groups can increase the reactivity of the active sites.Consequently,the incorporation of carbonyl structures and conjugated structures increases the capacity of polyimides.PTN,PAN,PMN,PSN,and PBN exhibit 212,198,199,151,and 115mAh g^(−1)at 50mAg^(−1),respectively.In addition,the introduction of a carbonyl structure and a conjugated structure is also beneficial for improving cycling stability and rate performance.This work can deepen the understanding of the structure–function relationship for the rational design of polyimide electrode materials and can be extended to the molecular design of other organic cathode materials.

关 键 词：Organic cathode materials Polymer electrode Lithium-ion batteries CARBONYL Polyimides 

分 类 号：O62[理学—有机化学]