Steering Yolk–Shell Nanostructures of 1D Unit‐Based Covalent Organic Frameworks as Binder Modulators
Abstract
Abstract Induced by their weak chain interactions, 1D unit‐based covalent organic frameworks (1D COFs) are favorable in molecular assembly, yet their exploration in morphology engineering and related energy storage applications are still rare. Here, a series of 1D COFs based nano‐structures (i.e. yolk–shell spheres (YS‐COF), hollow spheres (HS‐COF) and solid spheres (SS‐COF)) is prepared via a solvent‐induced strategy that can be applied as binder modulators for Li‐S batteries. Specifically, they can impart enhanced mechanical properties, more adaptability to volume change, and better ability in adsorbing/catalyzing lithium polysulfide intermediates (LiPSs) to traditional PVDF binder. Remarkably, the thus‐assembled YS‐COF‐based cell displays an initial specific capacity of up to 1011 mAh g −1 at 0.5 C, which is much higher than that of HS‐COF, SS‐COF, and PVDF‐based Li‐S batteries. Even at 4 C, it still maintains a discharge specific capacity of 962 mAh g −1 and can cycle for >600 cycles. DFT calculations and finite element simulation reveal the important roles of nanomorphology and functional groups of YS‐COF in promoting electrochemical redox kinetics to boost battery performances. This strategy might provide in‐depth insights in the morphology engineering and performance optimization of 1D COFs for Li‐S batteries.
Article Details
Authors (10)
Yiwen Yang
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering
Fengxue Duan
Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) State Key Laboratory of High Pressure and Superhard Materials College of Physics Jilin University Changchun 130012 China
Xiaoman Yao
Guangdong Provincial Key Laboratory of Carbon Dioxide Resource Utilization School of Chemistry South China Normal University Guangzhou 510006 P. R. China
Zhe Xuan
Guangdong Provincial Key Laboratory of Carbon Dioxide Resource Utilization School of Chemistry South China Normal University Guangzhou 510006 P. R. China
Xuanxu Chen
Guangdong Provincial Key Laboratory of Carbon Dioxide Resource Utilization School of Chemistry South China Normal University Guangzhou 510006 P. R. China
Mingjin Shi
Guangdong Provincial Key Laboratory of Carbon Dioxide Resource Utilization, School of Chemistry South China Normal University Guangzhou 510006 P.R. China
Zhengyang Chen
Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, College of Materials and Metallurgy Guizhou University Guiyang Guizhou 550025 China
Taoping Huang
Guangdong Provincial Key Laboratory of Carbon Dioxide Resource Utilization School of Chemistry South China Normal University Guangzhou 510006 P. R. China
Yifa Chen
Ya‐Qian Lan
Guangdong Provincial Key Laboratory of Carbon Dioxide Resource Utilization School of Chemistry South China Normal University Guangzhou P. R. China