Abstract
It is reported for the first time that iodine-doped reduced graphene oxide (I-rGO) has been designed as an anode material for sodium ion batteries (SIBs).
Highlights
IntroductionSodium ion batteries (SIBs) have been regarded as an ideal alternative for energy storage devices because of the low cost and abundance of Na resources.[1,2] many challenges must be addressed prior to their large-scale application.[3,4,5,6] To nd an ideal material to allow rapid Na+ insertion/extraction is of importance because Na ions have a larger radius than Li ions.[2,3,7] Carbon materials have been extensively investigated for SIB anodes.[8,9,10,11,12] the typical graphite material in lithium ion batteries (LIBs) shows poor performance since only a few sodium ions are inserted into the graphite layers.[13]
It has been demonstrated that reduced graphene oxide can serve as an anode for SIBs.[24,25,26,27] rGO nanosheets exhibited electrochemical performance with a reversible capacity of 141 mA h gÀ1 for SIBs.[28]
iodine-doped reduced graphene oxide (I-rGO) was prepared by annealing graphene oxide (GO) and iodine in argon
Summary
Sodium ion batteries (SIBs) have been regarded as an ideal alternative for energy storage devices because of the low cost and abundance of Na resources.[1,2] many challenges must be addressed prior to their large-scale application.[3,4,5,6] To nd an ideal material to allow rapid Na+ insertion/extraction is of importance because Na ions have a larger radius than Li ions.[2,3,7] Carbon materials have been extensively investigated for SIB anodes.[8,9,10,11,12] the typical graphite material in lithium ion batteries (LIBs) shows poor performance since only a few sodium ions are inserted into the graphite layers.[13]. Bene ting from the introduction of iodine atoms, I-rGO exhibits good cycling stability, high reversible capacity as well as improved coulombic efficiency. Such excellent electrochemical performance is superior to the reduce oxide graphene, proving that the I-doped graphene is an ideal anode material for sodium ion batteries
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