阳极
石墨烯
材料科学
电化学
碳纤维
无定形碳
制作
钾
无定形固体
纳米技术
化学工程
化学
电极
复合材料
复合数
有机化学
冶金
医学
替代医学
物理化学
病理
工程类
作者
Qing Sun,Deping Li,Jun Cheng,Linna Dai,Jianguang Guo,Liang Zhen,Lijie Ci
出处
期刊:Carbon
[Elsevier]
日期:2019-12-01
卷期号:155: 601-610
被引量:113
标识
DOI:10.1016/j.carbon.2019.08.059
摘要
Graphitic material has captured tremendous attentions as anode material for potassium ion batteries (PIBs). Nevertheless, the large radius of potassium-ions results in sluggish potassiation kinetics and huge volume expansion, leading to unsatisfying performance. Herein, a fabrication facile, cost-effective and high carbon yield nitrogen/oxygen co-doped amorphous carbon (NOC) with pitch and urea as precursors is reported. Pre-oxidation process is employed, maintaining the amorphous structure of pitch derived carbon against its soft carbon nature. The NOC electrode delivers reversible capacities of 347 (300th cycle) and 167 mAh g−1 (1000th cycle) at 100 and 2000 mA g−1, respectively. Rearrangement of graphene layers in short range benefits the structure stability against volume change. Kinetics analyses prove that surface-induced capacitive process dominates in K-ion storage mechanism, which contributes to the remarkable electrochemical performance. Pouch full cells were assembled, delivering a capacity of 316 mAh g−1 at 100 mA g−1. In view of the cost-effectiveness and electrochemical performance, this work offers a strategy for the fabrication of low-cost and high-performance PIB anode materials.
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