Mesoporous Iron Trifluoride Microspheres as Cathode Materials for Li-ion Batteries. (1st January 2015)

• Record Type: Journal Article
• Authors: Long, Zhen; Hu, Wenyuan; Liu, Lihu; Qiu, Guohong; Qiao, Wencan; Guan, Xiangfeng; Qiu, Xiaoqing
• Is Part Of: Electrochimica acta. Volume 151(2015)
• Page Start: 355
• Page End: 362
• Publication Date: 2015-01-01
• Subjects: Iron trifluoride -- Cathode materials -- Lithium ion batteries -- Electrochemical properties; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2014.11.029
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: Mesoporous FeF3 (H2 O)0.33 microspheres have been first synthesized by a facile solution method. The properties comparison of FeF3 (H2 O)0.33 with different morphologies and β-FeF3 · 3H2 O has been investigated. The mesoporous FeF3 (H2 O)0.33 microspheres still deliver a discharge capacity as large as 175.1 mA h g −1 at a high current density of 475 mA g −1 . The mesoporous FeF3 (H2 O)0.33 microspheres exhibit excellent cycle stability. Abstract: Mesoporous FeF3 (H2 O)0.33 microspheres, hexagonal columns, and β-FeF3 · 3H2 O square microrods have been prepared via facile solution methods using polyethylene glycol, oleic acid, and dodecyl trimethyl ammonium chloride as a surfactant, respectively. The as-prepared mesoporous FeF3 (H2 O)0.33 microspheres exhibits an enhanced lithium storage capacity and excellent cycling stability (159.2 mA h g −1 at 142 mA g −1 after 100 cycles). Even at a high current density of 474 mA g −1, mesoporous FeF3 (H2 O)0.33 microspheres still deliver a discharge capacity as large as 95.9 mA h g −1 after 100 cycles. This remarkable electrochemical performance can be attributed to the high specific surface area and mesoporous micro-spherical structure, which effectively increase the contact area between the active materials and the electrolyte, reducing the Li-ion diffusion pathway and buffering the volume change during cycling.