Dense integration of graphene paper positive electrode materials for aluminum-ion battery

• Published in: Ionics 2020, Vol.26 (1), p.245-254
• Main Authors: Qiao, Jia, Zhou, Haitao, Liu, Zhongsheng, Wen, Hejing, Du, Juan, Wei, Guokang, He, Changlei, Yang, Jianhong
• Format: Article
• Language: English
• Subjects: Aluminum-ion batteries; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Diffusion rate; Electrochemistry; Electrode materials; Electrodes; Energy Storage; Flux density; Graphene; Ion diffusion; Ions; Lithium; Optical and Electronic Materials; Original Paper; Renewable and Green Energy; Ultrahigh temperature
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-019-03170-7

Although Al-ion battery is attracting researchers’ attention worldwide, its volumetric energy density was not so promising due to low density of graphite-based positive electrodes in the current published literatures. Thus, defect-free yet densely packed graphene electrodes with high electronic conductivity and fast ionic diffusion are crucial to the realization of compacted Al-ion batteries with high volumetric energy density. In the present work, a self-supported and defect-free graphene-positive electrode (R H G-P-2850) was successfully produced by a hydriodic acid reduction of the graphene oxide (GO) method, followed by an ultrahigh temperature (2850 °C) annealing treatment. The density of the R H G-P-2850 (0.32 g cm −3 ) is currently the highest positive electrode material in the preparation of graphene-positive electrodes from GO. R H G-P-2850 positive electrode enables to deliver considerably high specific capacity 27.1 mAh cm −3 (85 mAh g −1 ) at the current density 2 A g −1 . More importantly, a remarkably stable performance was achieved with 20% fading over 8000 cycles. The results enlighten and promote the design and preparation of densely packed graphene-positive electrode to develop high-performance Al/graphene battery.