Iodine‐Doped Graphene with Opportune Interlayer Spacing as Superior Anode Materials for High‐Performance Lithium‐Ion Batteries

Abstract

In this article, the iodine doped graphene (I-RGO) materials with different interlayer spacings were prepared by a one-pot hydrothermal method, and the direct effect of the interlayer spacing on the electrochemical properties was studied as the anode materials of lithium ion batteries for the first time. The results show that the I-RGO 0.01 anode with the optimal interlayer spacing delivers a high specific capacity of 958.1 mAh g À1 after 390 cycles at the current density of 1 A g À1 . Furthermore, at the high current density of 2 and 4 A g À1 , the high-rate capacities of 525.8 and 343.1 mAh g À1 could still be achieved for the I-RGO 0.01 electrode after 1045 and 2000 cycles with the small capacity decay rates of 0.032 % and 0.024 % per cycle, respectively. The excellent electrochemical performance is mainly attributed to the expanded interlayer distance of graphene, which is capable of improving the electrode/electrolyte contact region and accelerating the difussion and surface absorption of lithium ion.[a] J.

Graphene Oxide Films Prepared Using Gelatin Nanofibers as Wearable Sensors for Monitoring Cardiovascular Health

“…The transmission electron microscopy (TEM) image of the CGF is shown in Figure b. An interlayer spacing of 0.37 nm was found which is consistent with that of GO film reported by others 19a,21. The CGF was also characterized by X‐ray diffraction (XRD) in the Supporting Information.…”

Extending the Service Life of High‐Ni Layered Oxides by Tuning the Electrode–Electrolyte Interphase

“…Note that the formation of fluorine‐enriched species could be related to the high reactivity of exterior AEI with LiPF 6 or its decomposition species (e.g., PF 5 and HF). And the Li‐enriched interior AEI arises from the kinetic barriers of Li‐ion diffusion within the AEI, which leads to Li deposition during long‐term cycling . On the other hand, for graphite cycled with 1.5% LiBOB (Figure b), the intermediate (oxygen‐rich organic species) and exterior (dissolved transition‐metal and fluorine‐enriched inorganic species) layers merge and constitute a comparatively thinner “two‐layer” AEI architecture with the interior (“dead” Li) layer, as opposed to the thick “three‐layer” AEI for the baseline sample (Figure a).…”

Novel iodine-doped reduced graphene oxide anode for sodium ion batteries

“…43 The improvement performance is also due to the corrosive characteristic of iodine that can help to react with and remove absorbed atoms from the graphene surface. 49 As far as we know, this work is the rst time to design I-doped graphene as anode material for SIBs. The design of I-rGO is more complicated because the iodine atomic radius is larger than that of carbon and other heteroatoms (e.g.…”

“…-OH), as reported in previous works. 48,49 The formation of I 3 À1 and I 5 À1 during the doping process can induce positive charge density on the surface of graphene, which will facilitate fast transport of Na ion, leading to better rate performance even at high current densities. These results show that iodine atoms are doped into rGO nanosheets.…”