Organic electrode materials are celebrated for their sustainability and adaptability, making them promising candidates for next-generation energy storage systems. However, challenges such as limited active-site density and inefficient utilization have impeded their practical application. Addressing these hurdles requires a deeper understanding of how molecular structure impacts electrochemical performance—an area where significant progress is now being made.
Published (DOI: 10.1016/j.esci.2023.100224) on August, 2024, in eScience, this innovative research was led by scientists from Jilin University and the Chinese Academy of Sciences. Through the design and evaluation of five distinct polyimide structures, the team demonstrated how incorporating carbonyl and conjugated structures can transform lithium-ion battery performance, providing a roadmap for future advancements.
The researchers synthesized and tested five polyimides—PTN, PAN, PMN, PSN, and PBN—each engineered with distinct molecular modifications to improve performance. Introducing carbonyl groups significantly increased active-site density, creating more redox-active sites and boosting theoretical capacity. Enhanced molecular rigidity proved critical for better accessibility, preventing excessive stacking and optimizing electrochemical interactions. Among the designs, PTN emerged as a standout, demonstrating the highest capacity (212 mAh g⁻¹ at 50 mA g⁻¹), exceptional stability, and superior rate performance. Furthermore, conjugated structures between carbonyl groups enhanced the reactivity of active sites, enabling efficient charge transfer and stabilizing radical intermediates. All polyimides displayed impressive cycling stability, with capacity retention rates exceeding 97% across extended use, showcasing the robustness of this molecular engineering approach. These findings illuminate new pathways for designing high-performance organic electrode materials.
Professor Hongyan Yao, the study's lead researcher, stated, “This research highlights how strategic molecular design can fundamentally enhance electrochemical properties. By focusing on structure-function relationships, we have opened the door to more sustainable and efficient energy storage solutions that meet the demands of modern applications.”
This breakthrough has profound implications for the future of lithium-ion battery technology. The advanced polyimide cathodes are well-suited for applications in portable electronics, electric vehicles, and large-scale energy grids. By addressing key limitations of organic cathodes, this study contributes to the global transition toward cleaner and more efficient energy systems, setting the stage for innovations that support a greener and more sustainable future.
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References
DOI
10.1016/j.esci.2023.100224
Original Source URL
https://doi.org/10.1016/j.esci.2023.100224
Funding information
The authors thank the financial support from the National Natural Science Foundation of China (No. 51903100) and the Science and Technology Development Plan of Jilin Province, P. R. China (No. 20210402060GH and 20230201138GX).
About eScience
eScience – a Diamond Open Access journal (free for both readers and authors before 2026) cooperated with KeAi and published online at ScienceDirect. eScience is founded by Nankai University and aims to publish high-quality academic papers on the latest and finest scientific and technological research in interdisciplinary fields related to energy, electrochemistry, electronics, and environment. eScience has been indexed by SCIE, CAS, DOAJ and Scopus. The First Impact Factor (2023) is 42.9. The founding Editor-in-Chief is Professor Jun Chen from Nankai University. He is an academician of the Chinese Academy of Sciences, a fellow of The World Academy of Sciences. eScience has published 21 issues, which can be viewed at https://www.sciencedirect.com/journal/escience.