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Achieving High Specific Capacity of Lithium-ion Battery Cathode by Modification with “N-O·” Radicals Oxygen-containing Functional Groups

Abstract

Enhancing the cathode capacity of lithium ion batteries (LIBs) has been one strategy to improve the energy density of batteries for electric vehicle applications, because of the limitation of inorganic cathode capacity. Here, we developed a new strategy to construct high capacity cathodes by using NMP pyrolysis to grow oxygen-containing functional groups on the Super P carbon black (SP) surface coated on commercial LiFePO4 (cLFP). Structural characterization using electron spin resonance (ESR) and X-ray photoelectron spectroscopy (XPS) showed that “N-O·” and “C=O” groups were present on the SP surface of cLFP@SP. The redox reaction occurred on these oxygen-containing functional groups and provided the excess capacity, allowing the composite cLFP@SP to achieve a capacity of 190 mAh g-1, which is higher than the theoretical maximum capacity of 170 mAh g-1. This work provides a new approach for enhancing cathode capacity by incorporating suitable “N-O·” radical and oxygen-containing functional groups on the surface of cathode.

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Publication details

The article was received on 01 Oct 2017, accepted on 13 Nov 2017 and first published on 14 Nov 2017


Article type: Communication
DOI: 10.1039/C7TA08688A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Achieving High Specific Capacity of Lithium-ion Battery Cathode by Modification with “N-O·” Radicals Oxygen-containing Functional Groups

    C. Lu, D. W. Rooney, X. Jiang, S. Wang, Z. Wang, J. Wang and K. Sun, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08688A

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