阳极
材料科学
杂原子
介孔材料
碳纤维
热解
电化学
化学工程
电极
钾
兴奋剂
扩散
多孔性
纳米技术
催化作用
复合材料
复合数
化学
光电子学
有机化学
冶金
戒指(化学)
物理化学
工程类
物理
热力学
作者
Jiefeng Zheng,Yuanji Wu,Tong Yong,Xi Liu,Yufeng Sun,Hongyan Li,Li Niu
标识
DOI:10.1007/s40820-021-00706-3
摘要
In view of rich potassium resources and their working potential, potassium-ion batteries (PIBs) are deemed as next generation rechargeable batteries. Owing to carbon materials with the preponderance of durability and economic price, they are widely employed in PIBs anode materials. Currently, porosity design and heteroatom doping as efficacious improvement strategies have been applied to the structural design of carbon materials to improve their electrochemical performances. Herein, nitrogen-doped mesoporous carbon spheres (MCS) are synthesized by a facile hard template method. The MCS demonstrate larger interlayer spacing in a short range, high specific surface area, abundant mesoporous structures and active sites, enhancing K-ion migration and diffusion. Furthermore, we screen out the pyrolysis temperature of 900 °C and the pore diameter of 7 nm as optimized conditions for MCS to improve performances. In detail, the optimized MCS-7-900 electrode achieves high rate capacity (107.9 mAh g-1 at 5000 mA g-1) and stably brings about 3600 cycles at 1000 mA g-1. According to electrochemical kinetic analysis, the capacitive-controlled effects play dominant roles in total storage mechanism. Additionally, the full-cell equipped MCS-7-900 as anode is successfully constructed to evaluate the practicality of MCS.
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