Fast Intercalation in Locally Ordered Carbon Nanocrystallites for Superior Potassium Ions Storage. (27th November 2021)

• Record Type: Journal Article
• Authors: Han, Xu; Chen, Tianming; Zhang, Panpan; Qi, Ying; Yang, Pan; Zhao, Yanhua; Shao, Meng; Wu, Jiansheng; Weng, Jiena; Li, Sheng; Huo, Fengwei
• Is Part Of: Advanced functional materials. Volume 32:Number 10(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-27
• Subjects: hard carbon -- microstructures -- nanocrystallites -- potassium‐ion batteries -- storage mechanism; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202109672
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Hard carbons (HCs) have great potential as anode material for high‐performance potassium ion batteries (PIBs). However, due to the complexity of HCs, the relationship between their structures and potassium (K) storage behaviors is still not quite clear. Here, three types of HCs with different structures are designed for further understanding the electrochemical storage processes. Among them, the carbon spheres (CS) exhibit impressive rate performance (161.6 mAh g −1 at 2 A g −1 ) and cycle stability (140.2 mAh g −1 at 2 A g −1 after 500 cycles). The superior performance of CS can be mainly ascribed to the intercalation into its locally‐ordered carbon nanocrystallites, and the charge/discharge processes are further characterized with significant pseudocapacitive dominating. Suitable nanocrystalline size and the ratio of defects with proper morphology are the key factors to improve K storage efficiency. This work will contribute to understanding the role of these factors in the K storage performance of carbon materials. Abstract : Three types of hard carbons are prepared with different structures. The solid carbon spheres can deliver superior performance compared to the hollow spheres and the bulk carbon. This can be ascribed to the fast intercalation into its locally ordered nanocrystallites. Reasonable nanocrystalline size and the ratio of the defects are the key factors to the K storage performance.