Redox of anionic and cationic radical intermediates in a bipolar polyimide COF for high-performance dual-ion organic batteries
Bipolar organic materials for dual-ion batteries have attracted immense attention due to the low cost, high theoretical capacity, and potential sustainability. However, the bipolar organic batteries are plagued by low reversible capacity and poor stability. Herein, a novel bipolar polyimide COF with n-type imide units and p-type quaternary nitrogen centers exhibits unique topology structure and is used for dual-ion organic batteries. Detailed analyses reveal that the redox of anionic imide radicals and cationic nitrogen-center radicals was triggered to store the Li ions and PF anions, respectively, during the charge/discharge processes. Electrolyte engineering demonstrates that the electrolyte additives vinylene carbonate (VC) and fluoroethylene carbonate (FEC) would inactivate the imide units and result in low capacities and poor reversibility of the COF electrodes. With the unique structure and optimized electrolyte, the bipolar COF exhibits high capacity of 165 mAh/g at 30 mA/g and high capacity retention of 91 % after 4000 cycles at 1 A/g, surpassing most of the bipolar electrodes. This work not only expands the palette to design bipolar materials for rechargeable batteries but also emphasizes the importance of the matching strategy of electrolytes and organic electrodes.
National Outstanding Youth Science Fund Project of National Natural Science Foundation of China;
|WOS Research Area|
Engineering, Environmental ; Engineering, Chemical
|WOS Accession No|
|ESI Research Field|
Cited Times [WOS]:0
|Document Type||Journal Article|
|Department||Department of Materials Science and Engineering|
1.Department of Materials Science and Engineering,Guangdong-Hong Kong-Macao,Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices,Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
2.Department of Mechanical Engineering,City University of Hong Kong,Kowloon,999077,Hong Kong
|First Author Affilication||Department of Materials Science and Engineering|
|First Author's First Affilication||Department of Materials Science and Engineering|
Gu，Shuai,Chen，Jingjing,Hao，Rui,et al. Redox of anionic and cationic radical intermediates in a bipolar polyimide COF for high-performance dual-ion organic batteries[J]. CHEMICAL ENGINEERING JOURNAL,2023,454.
Gu，Shuai.,Chen，Jingjing.,Hao，Rui.,Chen，Xi.,Wang，Zhiqiang.,...&Lu，Zhouguang.(2023).Redox of anionic and cationic radical intermediates in a bipolar polyimide COF for high-performance dual-ion organic batteries.CHEMICAL ENGINEERING JOURNAL,454.
Gu，Shuai,et al."Redox of anionic and cationic radical intermediates in a bipolar polyimide COF for high-performance dual-ion organic batteries".CHEMICAL ENGINEERING JOURNAL 454(2023).
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