Oxygen functionalization boosted sodium adsorption-intercalation in coal based needle coke

• Published in: Electrochimica acta Vol. 329; p. 135127
• Main Authors: Zhao, Dan, Zhao, Hanqing, Ye, Jianqi, Song, Wei, Miao, Siyu, Shen, Hanting, Zhao, Yu, Kang, Mengmeng, Li, Zhong
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.01.2020; Elsevier BV
• Subjects: Adsorption; Adsorption-intercalation; Anode; Coke; Functional groups; Intercalation; Interlayers; Mass spectrometry; Needle coke; Oxygen functional groups; Reaction kinetics; Sodium ion battery; Sodium-ion batteries; Toxicity; X ray absorption; Sodium ion battery; Oxygen functional groups; Anode; Needle coke; Adsorption-intercalation
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2019.135127

In this work, oxygen functional groups (OFGs) was introduced into needle coke to increase sodium storage sites (CO) and tailor the interlayer distances from 3.44 to 3.84 Å for Na+ adsorption and intercalation. The OFGs are determined precisely using X-ray absorption near-edge structure spectroscopy and thermogravimetric-mass spectrometry. Benefiting from the coordination of fast surface redox reaction kinetics and boosted Na+ intercalation process, the resulting material under optimal oxidization realizes a superior reversible capacity of 385 mA h g−1 at 0.05 A g−1, showing great potentials in the large-scale application for sodium ion batteries anodes. [Display omitted] •Needle coke (NC) is oxygen-functionalized through a facile strategy.•Oxygen-functionalized NC constitutes “adsorption-intercalation” Na+ storage system.•Oxygen-functionalization endows NC fast adsorption and intercalation kinetics.•The oxygen-functionalized NC realizes a high electrochemical performance.