Rational Construction of Advanced Potassium Ion Diffusion and Storage Matrix

Jianjiang He, Tiantian Lu, Kun Wang, Xin Wang, Xiaodong Li, Xiangyan Shen, Juan Gao, Wenyan Si, Ze Yang, Changshui Huang*

*此作品的通讯作者

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48 引用 (Scopus)

摘要

Developing new electrode materials with a regular channel for stable storage and diffusion of potassium (K) ions is crucial to alleviating the ubiquitous problems in K-ion batteries (KIBs) such as slow diffusion rate, huge volume expansion, and unstable interface by the large K ion radius. Herein, electrode material with a facile diffusion pathway, vast space for volume expansion, and good interfacial compatibility are found to be necessary. Fluoride graphdiyne (F-GDY) is illustrated for its expanded conductive skeleton, uniform structural pores, and well-distributed F atoms. First-principles computations and electrochemical characterizations reveal the high reversible capacity and cyclic stability for the instanced F-GDY electrode through the ultralow diffusion barrier, abundant exposed active sites, and stable KF-enriched solid electrolyte interphase film. The F-GDY anode exhibits a capacity of 320 mAh g−1 at 50 mA g−1, and 120 mAh g−1 at 1000 mA g−1 for 1800 cycles. These electrochemical performances of F-GDY anode are superior than those of many other carbon materials reported to date, providing us with a new insight into the design of an electrode for KIBs.

源语言英语
文章编号2005933
期刊Advanced Functional Materials
31
5
DOI
出版状态已出版 - 27 1月 2021
已对外发布

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He, J., Lu, T., Wang, K., Wang, X., Li, X., Shen, X., Gao, J., Si, W., Yang, Z., & Huang, C. (2021). Rational Construction of Advanced Potassium Ion Diffusion and Storage Matrix. Advanced Functional Materials, 31(5), 文章 2005933. https://doi.org/10.1002/adfm.202005933