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Center-iodized graphene material as an advanced anode to significantly boost the performance of lithium-ion batteries

Abstract

Iodine edge-doped graphene can improve the capacity and stability of lithium-ion batteries (LIBs).1 Our theoretical calculations indicate that center-iodization can further significantly enhance the anode catalytic process. To experimentally prove the theoretical prediction, iodine-doped graphene materials were prepared by one-pot hydrothermal and ball-milling approaches to realize different doping-sites. Results show that the center-iodinated graphene (CIG) anode exhibits remarkably high reversible capacity (1121 mAh g-1 after 180 cycles at 0.5 A g-1), long-cyclic life (0.01% decay per cycle over 300 cycles at 1 A g-1) and high-rate capacity (374 mAh g-1 after 800 cycles at 8 A g-1), which greatly improves the performance of the edge-iodinated graphene anode and is in good agreement with the theoretical analysis. More importantly, the CIG anode also delivers a high-rate capacity and excellent cycling stability (279 mAh g-1 after 500 cycles at 10 A g-1) in full-cells. Both theoretical analysis and experimental investigation reveal the enhancement mechanism, in which the center-iodization increases the surface charge for fast electron transfer rate, improves the conductivity for charge transport and rationalizes the pore structure for enhanced mass transport and ion insertion/desertion, thus resulting in high rate capacity and long cycle life. This work not only discloses the critical role of catalytic sites including both amount and site position, but also offers great potentials for high-power rechargeable LIBs applications.

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Publication details

The article was received on 04 Jan 2018, accepted on 11 Apr 2018 and first published on 13 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR00061A
Citation: Nanoscale, 2018, Accepted Manuscript
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    Center-iodized graphene material as an advanced anode to significantly boost the performance of lithium-ion batteries

    J. Chen, M. Xu, J. Wu and C. M. Li, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR00061A

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