EQCM studies of composition and electrochemical performance of film prepared by electrochemical reduction of sodium ferrate

作者：Zhao Li^*; Chen Bai Shuang; Zhang Jia Lin; Wang Dian Long

来源：Journal of Solid State Electrochemistry, 2012, 16(6): 2079-2084.

DOI：10.1007/s10008-011-1618-y

• Electrochemical quartz crystal microbalance
• Ferrate
• Film electrode
• Lithium ion battery

A solid film was prepared by electrodepositing on a gold-film-coated quartz crystal electrode in Na2FeO4 solution, and characterized in 1 M LiClO4/propylene carbonate (PC) + 1, 2-dimethoxyethane (DME; 1:1 by volume) electrolyte using electrochemical quartz crystal microbalance (EQCM). The EQCM experimental and X-ray photoelectron spectroscopy results indicate that the composition of the electrodeposited solid film prepared in the potential range of 0.18 to -0.57 V vs. Ag/AgCl is FeOOH; and almost 1 mol lithium ions can be intercalated into and then extracted from 1 mol FeOOH film during discharge/charge process in 1 M LiClO4/PC + DME electrolyte. The discharge/charge experiment indicates that the specific capacity of FeOOH film stabilizes at a value close to its theoretical specific capacity after 20 cycles, and FeOOH film maintains a specific capacity of about 300 mAh g(-1) at the end of 170 cycles. It is therefore concluded that the FeOOH film has a good electrochemical cycle ability in 1 M LiClO4/PC + DME electrolyte.

• 出版日期2012-6
• 单位哈尔滨工业大学