结晶度
钾
阳极
化学工程
电解质
多孔性
材料科学
石墨
法拉第效率
碳纤维
离子
化学
复合材料
有机化学
复合数
冶金
电极
物理化学
工程类
作者
Seung Ho Choi,Jesse Baucom,Xinru Li,Li Shen,Kati Raju,In-Sub Han,Yun Ju Choi,You Na Ko,Hae Jin Kim,Yunfeng Lu
标识
DOI:10.1016/j.jcis.2020.05.051
摘要
Porous carbon materials are promising candidates for anode materials in rechargeable potassium-ion batteries. However, their high surface area and low crystallinity usually cause side reactions with electrolytes and slanted charge/discharge profiles. Herein, we report the synthesis of porous carbon microspheres with highly graphitized structure and enhanced potassium-ion storage properties. The prepared carbon microspheres exhibit a low working potential of ~0.2 V, high Coulombic efficiency, and a stable reversible capacity of 292.0 mAh/g after 100 cycles, which is significantly higher than that of commercial graphite (137.5 mAh/g after 100 cycles). These desirable performances are attributed to the high crystallinity of carbon and its porous structure, which provide active sites for potassium-ion storage and alleviate the stress caused by the large volume change during the insertion and extraction of potassium ions.
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