阳极
石墨
电解质
法拉第效率
钾离子电池
钾
材料科学
化学工程
扩散
电极
无机化学
化学
冶金
磷酸钒锂电池
工程类
物理化学
物理
热力学
作者
Yongling An,Huifang Fei,Guifang Zeng,Lijie Ci,Baojuan Xi,Shenglin Xiong,Jinkui Feng
标识
DOI:10.1016/j.jpowsour.2017.12.033
摘要
Design and synthesis of capable anode materials that can store the large size K+ is the key of development for potassium–ion batteries. The low–cost and commercial expanded graphite with large particles is a graphite–derived material with good conductivity and enlarged interlayer spaces to boost the potassium ion diffusion coefficient during charge/discharge process. Thus, we achieve excellent anode performance for potassium–ion batteries based on an expanded graphite. It can deliver a capacity of 263 mAh g−1 at the rate of 10 mA g−1 and the reversible capacity remains almost unchanged after 500 cycles at a high rate of 200 mA g−1 with a coulombic efficiency of around 100%. The potassium storage mechanism is investigated by the ex situ XRD technique. This excellent potassium storage performance will make the expanded graphite promising anode candidate for potassium ion batteries.
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