Surface reaction of β-FeOOH film negative electrode for lithium-ion cells

✍ Scribed by T. Tabuchi; Y. Katayama; T. Nukuda; Z. Ogumi

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 540 KB
• Volume: 191
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2009.02.021

✦ Synopsis

Electrochemical performance of ␤-FeOOH thin film has been investigated for a low-cost and environmentally friendly negative electrode with a large capacity. The electrode was found out to give an initial large discharge capacity of 864 mAh g -1 and good cycleability with a constant value around 700 mAh g -1 at subsequent cycles. In the first charge process, one electron change reaction proceeded from the initial rest potential of 3.04-1.65 V vs. Li/Li + , resulting in the formation of divalent product FeOOHLi. Further charging caused the surface film formation like solid electrolyte interface (SEI) between 1.65 V and 1.18 V vs. Li/Li + together with the reduction of Fe compound from divalent to partially zero-valent, followed by its film growth from 1.18 V to 0.07 V vs. Li/Li + .