Bi2S3 nanorods encapsulated in iodine-doped graphene frameworks with enhanced potassium storage properties

• Published in: Chinese chemical letters Vol. 33; no. 6; pp. 3212 - 3216
• Main Authors: Wei, Yi, Hou, Wenhui, Zhang, Peng, Soomro, Razium A., Xu, Bin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2022; Beijing Advanced Innovation Center for Soft Matter Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China; State Key Laboratory of Organic-Inorganic Composites,Beijing Key Laboratory of Electrochemical Process and Technology for Materials,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China%State Key Laboratory of Organic-Inorganic Composites,Beijing Key Laboratory of Electrochemical Process and Technology for Materials,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China
• Subjects: Anode materials; Bi2S3; Iodine-doped graphene; Nanorods; Potassium-ion battery; Iodine-doped graphene; Potassium-ion battery; Bi2S3; Nanorods; Anode materials
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2021.10.035

Bismuth sulfide (Bi2S3) is a promising anode material for high-performance potassium ion batteries due to its high theoretical capacity. However, the poor conductivity and substantial volume expansion hinder its practical application. We proposed an iodine-doped graphene encapsulated Bi2S3 nanorods composite (Bi2S3/IG) as an efficient anode for PIBs. The uniform-sized Bi2S3 nanorods evenly in-situ encapsulated in iodine-doped graphene framework, facilitating the electron transportation and structural stability. The potassium storage performance was evaluated in three electrolytes, with the best option of 5 mol/L KFSI in DME. The reversible capacity of representative Bi2S3/IG reached 453.5 mAh/g at 50 mA/g. Meanwhile, it could deliver an initial reversible capacity of 413.6 mAh/g at 100 mA/g, which maintained 256.9 mAh/g after 200 cycles. The proposed strategy contributes to improving potassium storage performance of metal sulfide anodes. Bi2S3 nanorods were in-situ encapsulated in iodine-doped graphene to construct a robust anode material for potassium ion batteries with competitive capacity, rate capability and cycling stability. [Display omitted]