Boosting the potassium storage performance of carbon anode via integration of adsorption-intercalation hybrid mechanisms. (July 2020)

• Record Type: Journal Article
• Authors: Zeng, Sifan; Chen, Xingjia; Xu, Rui; Wu, Xiaojun; Feng, Yuezhan; Zhang, Haibin; Peng, Shuming; Yu, Yan
• Is Part Of: Nano energy. Volume 73(2020)
• Publication Date: 2020-07
• Subjects: Dual-doping -- Graphene foam -- Freestanding anode -- Potassium ion storage; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2020.104807
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Graphitic carbon has been drawn extensive attention as an anode for Potassium-ion battery (KIB) because it is favorable for K-intercalation. However, the application of graphitic carbon anode for KIB is prevented by the poor cyclability and poor rate capability, resulting from the huge volume expansion and structural collapse after repeat charge/discharge. Herein, by advantageous functional integration of adsorption-intercalation potassium storage mechanisms, we design flexible nitrogen (N) and oxygen (O) dual-doped carbon coated graphene foam films (denoted as NOC@GF) that realizes unprecedented electrochemical performance for KIBs. Such advanced architecture can release the respective advantages of graphitic carbon with high electrical conductivity stability and favorable of K-intercalation, and amorphous heteroatoms doping carbon layers with abundant active sites for potassium adsorption storage. It delivers high reversible capacity (319 mA h/g at 0.1 A/g with a capacity retention of 94.9% after 550 cycles), long cycling stability (281 mA h/g at 1 A/g with a capacity retention of 98.1% after 5500 cycles), and excellent rate capability (123 mA h/g at 5.0 A/g). And density functional theory (DFT) calculations prove that N and O doping sites are benefit to facilitating K ion adsorption and the graphitic carbon promotes K-ion intercalation storage. Graphical abstract: The flexible N and O dual-doped carbon coated graphene foam films show superior potassium ion storage performance owing to integration of adsorption-intercalation hybrid mechanisms. Image 1 Highlights: Constructing heteroatoms doping carbon coated graphene foam structure. Exploring the adsorption-intercalation hybrid mechanisms of NOC@GF. DFT calculations proved the advantages of this composite structure.