Bamboo-structured N-doped CNTs/FeF3·0.33H2O derived from melamine as a high-performance cathode for Li-ion batteries

• Published in: New journal of chemistry 2021-10, Vol.45 (38), p.18019-18024
• Main Authors: Ding, Jing, Zhou, Xiangyang, Luo, Chucheng, Yang, Juan, Tang, Jingjing
• Format: Article
• Language: English
• Subjects: Annealing; Bamboo; Cathodes; Electrical resistivity; Electrochemical analysis; Electrode materials; Electron conductivity; Electron transport; Fluorination; Lithium-ion batteries; Melamine; Metal fluorides; Morphology; Pyrolysis; Rechargeable batteries
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d1nj02855c

FeF3·0.33H2O with a special one-dimension tunnel structure has been considered as a potential cathode material. However, the low electron conductivity of FeF3·0.33H2O prevents its practical application. FeF3·0.33H2O coupled with a carbon material is an effective method to solve the low electric conductivity of FeF3·0.33H2O. Hence, we apply a facile approach using the catalyzed pyrolysis of melamine and a fluorination–annealing process to synthesize the N-doped CNTs/FeF3·0.33H2O composite with a bamboo-like morphology. The as-prepared composite displays a good cycling performance with a reversible discharge capacity of 160.7 mA h g−1 at 40 mA g−1 after 100 cycles and a good rate performance, as well as a good electrochemical performance even at a relatively high mass loading. The good electrochemical properties can be mainly ascribed to the fact that N-doped CNTs play the role of a cross-linked conductive network to provide an electron-transport expressway in the active material. This simple catalyzed pyrolysis and fluorination–annealing approach provides a promising avenue for the application of iron fluoride as a cathode material.