首页|Indolocarbazole-Based Small Molecule Cathode-Active Material Exhibiting Double Redox for High-Voltage Li-Organic Batteries

Indolocarbazole-Based Small Molecule Cathode-Active Material Exhibiting Double Redox for High-Voltage Li-Organic Batteries

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Most organic electrode materials(OEMs)for rechargeable batteries employ n-type redox centers,whose redox potentials are intrinsically limited＜3.0 V versus Li+/Li.However,p-type materials possessing high redox potentials experience low specific capacities because they are capable of only a single redox reaction within the stable electrochemical window of typical electrolytes.Herein,we report 5,11-diethyl-5,11-dihydroindolo[3,2-b]carbazole(DEICZ)as a novel p-type OEM,exhibiting stable plateaus at high discharge potentials of 3.44 and 4.09 V versus Li+/Li.Notably,the second redox potential of DEICZ is within the stable electrochemical window.The mechanism of the double redox reaction is investigated using both theoretical calculations and experimental measurements,including density functional theory calculations,ex situ electron spin resonance,and X-ray photoelectron spectroscopy.Finally,hybridization with single-walled carbon nanotubes(SWCNT)improves the cycle stability and rate performance of DEICZ owing to the π-π interactions between the SWCNT and co-planar molecular structure of DEICZ,preventing the dissolution of active materials into the electrolyte.The DEICZ/SWCNT composite electrode maintains 70.4％of its initial specific capacity at 1-C rate and also exhibits high-rate capability,even performing well at 100-C rate.Furthermore,we demonstrate its potential for flexible batteries after applying 1000 bending stresses to the composite electrode.

composite electrodesflexible batteriesindolocarbazolesorganic rechargeable batteriesp-type

Hyunji Park、Hyojin Kye、Jong-Sung Lee、Young-Chang Joo、Dong Joo Min、Bong-Gi Kim、Soo Young Park、Ji Eon Kwon

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Laboratory for Supramolecular Optoelectronic Materials(LSOM),Department of Materials Science and Engineering,Research Institute of Advanced Materials(RIAM),Seoul National University,1 Gwanak-ro,Gwanak-gu,Seoul 08826,Korea

Functional Composite Materials Research Center,Jeonbuk Institute of Advanced Composite Materials,Korea Institute of Science and Technology(KIST),92 Chudong-ro,Bongdong-eup,Wanju-gun,Jeonbuk 55324,Korea

Department of Organic and Nano System Engineering,Konkuk University,120 Neungdong-ro,Gwangjin-gu,Seoul 05029,Korea

Department of Materials Science and Engineering,Seoul National University,1 Gwanak-ro,Gwanak-gu,Seoul 08826,Korea

Department of JBNU-KIST Industry Academia Convergence Research,Jeonbuk National University,567 Baekje-daero,Deokjin-gu,Jeonju,Jeonbuk 54896,Korea

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National Research Foundation(NRF)of Korea grant funded by the Korean government(MSIT)Korea Institute of Science and Technology(KIST,Korea)Institutional ProgramKorea Institute of Science and Technology(KIST,Korea)Institutional ProgramBasic Science Research Program through the NRF funded by the Ministry of Science

2023R1A2C20026052Z069032E32634NRF-2021R1A2C4002030

2024

10.1002/eem2.12694

能源与环境材料(英文)

能源与环境材料(英文)

ISSN：
年,卷(期)：2024.7(5)