Mechanochemical synthesis of NaMF3 (M = Fe, Mn, Ni) and their electrochemical properties as positive electrode materials for sodium batteries

✍ Scribed by Irina D. Gocheva; Manabu Nishijima; Takayuki Doi; Shigeto Okada; Jun-ichi Yamaki; Tetsuaki Nishida

• Book ID: 104025429
• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 1021 KB
• Volume: 187
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2008.10.110

✦ Synopsis

Mechanical treatment was used as a nonconventional solid-state process for large-scale preparation of fluoride materials as an alternative to the hazardous high-pressure fluorination route. Sodium fluoroperovskites of Fe, Mn, and Ni were achieved by mechanical grinding of NaF and binary metal fluorides for different periods of time under Ar. The obtained monophases were characterized by XRD measurements, AAS, ICP-OES, and IC. The electrochemical performance of the achieved materials was tested in a Na halfcell under different operating conditions. It was revealed that mechanochemically inserted sodium is electrochemically active for the NaFeF 3 positive electrode composition. In this pilot study, NaFeF 3 showed an initial discharge capacity of 130 mA h g -1 at 0.2 mA cm -2 .