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옥벼리,나원준,권태훈,권영완,조상호,홍순만,Albert S. Lee,이진홍,구종민 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
Non-aqueous lithium-ion redoxflow batteries (Li-RFBs) have recently garnered much interest because oftheir high operating voltage and energy density. Albeit these outstanding advantages, challenges, such aspoor cyclability and efficiency, still remain in employing the practical application. In an attempt toaddress these problems, a series of 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) and TEMPO derivativescatholytes were prepared and investigated as redox-active materials. Electrochemical evaluationexhibited that the introduction of polar and electron-withdrawing substituents to TEMPO was able toenhance the rate capability and cycling stability, when compared to those with the neat TEMPO. Extensive analysis of the electrochemical properties revealed that the electrophilic heteroatom stabilizedthe radical as well as alleviated the catholyte degradation. Overall, a careful selection of redox-activespecies demonstrates great promise in improving the current redoxflow battery technology.
Ok, Byeori,Na, Wonjun,Kwon, Tae-Hoon,Kwon, Young-Wan,Cho, Sangho,Hong, Soon Man,Lee, Albert S.,Lee, Jin Hong,Koo, Chong Min Elsevier 2019 Journal of industrial and engineering chemistry Vol.80 No.-
<P><B>Abstract</B></P> <P>Non-aqueous lithium-ion redox flow batteries (Li-RFBs) have recently garnered much interest because of their high operating voltage and energy density. Albeit these outstanding advantages, challenges, such as poor cyclability and efficiency, still remain in employing the practical application. In an attempt to address these problems, a series of 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) and TEMPO derivatives catholytes were prepared and investigated as redox-active materials. Electrochemical evaluation exhibited that the introduction of polar and electron-withdrawing substituents to TEMPO was able to enhance the rate capability and cycling stability, when compared to those with the neat TEMPO. Extensive analysis of the electrochemical properties revealed that the electrophilic heteroatom stabilized the radical as well as alleviated the catholyte degradation. Overall, a careful selection of redox-active species demonstrates great promise in improving the current redox flow battery technology.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>