纳米棒
石墨烯
阳极
铋
材料科学
碘
化学工程
钾
电解质
硫化物
兴奋剂
纳米技术
化学
光电子学
电极
冶金
物理化学
工程类
作者
Yi Wei,Wenhui Hou,Peng Zhang,Razium Ali Soomro,Bin Xu
标识
DOI:10.1016/j.cclet.2021.10.035
摘要
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.
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