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Highly Dispersed cobalt nanoparticles Embedded in nitrogen-Doped Graphitized Carbon for Fast and Durable Potassium Storage

引用

nano-Micro Letters 2021年第2期13卷 1-12页

作者： Xiaodong Shi Zhenming Xu Cheng Han Runze Shi Xianwen Wu Bingan Lu Jiang Zhou Shuquan Liang School of Materials Science and Engineering Central South UniversityChangsha 410083People’s Republic of China University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Harvard John.A.Paulson School of Engineering and Applied Sciences Harvard University29 Oxford StreetCambridgeMA 02138USA School of Chemistry and Chemical Engineering Jishou UniversityJishou 416000People’s Republic of China School of Physics and Electronics State Key Laboratory of Advanced Design and Manufacturing for Vehicle BodyHunan UniversityChangsha 410082People’s Republic of China Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province Central South UniversityChangsha 410083People’s Republic of China

Potassium-ion batteries(KIBs)have great potential for applications in large-scale energy storage ***,the larger radius of K+leads to sluggish kinetics and inferior cycling performance,severely restricting its practical ***,we propose a rational strategy involving a Prussian blue analogue-derived graphitized carbon anode with fast and durable potassium storage capability,which is constructed by encapsulating cobalt nanoparticles in nitrogen-doped graphitized carbon(co-nC).Both experimental and theoretical results show that n-doping effectively promotes the uniform dispersion of cobalt nanoparticles in the carbon matrix through co-n ***,the cobalt nanoparticles and strong co-n bonds synergistically form a threedimensional conductive network,increase the number of adsorption sites,and reduce the diffusion energy barrier,thereby facilitating the adsorption and the diffusion *** multiple effects lead to enhanced reversible capacities of 305 and 208.6 mAh g^−1 after 100 and 300 cycles at 0.05 and 0.1 A g^−1,respectively,demonstrating the applicability of the co-nC anode for KIBs.

关键词： cobalt nanoparticles nitrogen-doped graphitized carbon co-n bonds Cycling stability Potassium-ion batteries

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