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129th General Meeting of Korean Chemical Society & Exposition Isoindigo-based organic small-molecule cathodes for long cycle life and high-rate secondary batteries

Submission Date :
2 / 28 / 2022 , 15 : 33 : 25
Abstract Number :
129022827777
Presenting Type:
Oral Presentation
Presenting Area :
Electrochemistry - Oral Presentation of Young Scholars in Electrochemistry
Authors :
Jong-Jin Park, Ji Eon Kwon*
Functional Composite Materials Research Center, Korea Institute of Science and Technology, Korea
Assigned Code :
ELEC.O-12 Assigend Code Guideline
Presenting Time :
THU, 10 : 50
Redox-active organic molecules (ROMs) are promising electrode materials for next-generation rechargeable batteries owing to their beneficial advantages of environmental friendliness, natural abundance, low cost, and possible high theoretical capacity. However, they suffer from a serious dissolution problem in organic electrolytes and low electrical conductivity, limiting their practical application. In particular, despite many advantages such as easy synthesis, potential low cost, and convenient processing, small-molecule electrode materials have typically showed far inferior stability and rate performance than polymeric materials. Herein, two isoindigo-based small molecules, isoindigo (Me-IIG) and thienoisoindigo (Me-TIIG), were synthesized and evaluated as a cathode material in lithium-organic batteries. In a Li coin cell, Me-IIG and Me-TIIG electrode exhibited specific capacity of 156 and 168 mAh g-1 at 1C, corresponding to 84% and 95% of capacity utilization, respectively. The Me-TIIG with better molecular planarity than the Me-IIG showed much lower solubility in organic electrolytes with the aid of strong intra- and intermolecular interactions. As a result, the Me-TIIG electrode presented remarkably improved cycling stability, retaining 80% (135 mAh g-1) of the initial capacity after 500 cycles at 1C rate. Moreover, Me-TIIG exhibited lower reorganization energy than Me-IIG, which can facilitate a kinetically faster electrochemical pathway, leading to superior rate capability. It should be noted that the Me-TIIG electrode showed excellent rate performance achieving 40% capacity retention (70 mAh g-1) at a high rate of 50C.