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Polynitroxide-grafted-graphene: a superior cathode for lithium ion batteries with enhanced charge hopping transportation

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Abstract

The emergence of organic nitrogen-oxide (NO) radical polymers has brought hope in the pursuit of high performance lithium-ion batteries (LIBs). However, the unstable conductivity has always caused the NO polymer electrodes to have inferior electrochemical performance. Herein, we constructed a new and remarkably conductive polynitroxide-grafted-graphene (NO-g-rGO) cathode that is similar to organic polymer cathodes with a high concentration of nitroxide radicals. Elevated levels of NO on the surface of reduced graphene oxide (rGO) were achieved via esterification between 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (HTEMPO) and a high concentration of carboxylated rGO. The fold on the surface of rGO shortens the distance of electron transport between radical monomers, thereby enhancing the conductivity of NO-g-rGO, which showed a high specific capacity of 256 mA h gāˆ’1 after 200 cycles. The dramatic performance of NO-g-rGO was achieved through promoting the conductivity of NO. As a novel concept, this work provides a fresh perspective on the application of organic radical cathodes in high energy density LIBs.

Graphical abstract: Polynitroxide-grafted-graphene: a superior cathode for lithium ion batteries with enhanced charge hopping transportation

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Publication details

The article was received on 07 Jan 2019, accepted on 07 Feb 2019 and first published on 09 Feb 2019


Article type: Communication
DOI: 10.1039/C9TA00218A
Citation: J. Mater. Chem. A, 2019, Advance Article

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    Polynitroxide-grafted-graphene: a superior cathode for lithium ion batteries with enhanced charge hopping transportation

    C. Lu, G. Pan, Q. Huang, H. Wu, W. Sun, Z. Wang and K. Sun, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA00218A

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