Effect of chemical oxidation for nano-size γ-Fe2O3 as lithium battery cathode

被引:26
作者
Kanzaki, Sho [1 ]
Yamada, Atsuo [1 ]
Kanno, Ryoji [1 ]
机构
[1] Tokyo Inst Technol, Dept Elect Chem, Interdisciplinary Grad Sch Sci & Engn, Yokohama, Kanagawa 2268502, Japan
关键词
iron oxide; lithium battery electrode; spinel-rocksalt transformation; nano particle;
D O I
10.1016/j.jpowsour.2006.12.001
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Surface treatment of nano-crystalline gamma-Fe2O3 was examined to improve its electrochemical performances for lithium battery. Removal of residual phases on the surface by chemical oxidation with NO2BF4 was confirmed by TG measurement and FT-IR spectroscopy, and the process improved charge-discharge characteristics; higher capacity and better reversibility were obtained. The charge-discharge mechanism was studied by X-ray diffraction measurement and Mossbauer spectroscopy. The reversible charge-discharge reaction of the nano-size gamma-Fe2O3 was proceeded by a phase transition between the spinel and the disordered rock-salt type, which was previously claimed to be an irreversible process for the bulk materials. The nano-size effect of the phase transitions and the charge-discharge mechanism will be discussed. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:403 / 407
页数:5
相关论文
共 24 条
[1]   Preparation of LiFeO2 with alpha-NaFeO2-type structure using a mixed-alkaline hydrothermal method [J].
Ado, K ;
Tabuchi, M ;
Kobayashi, H ;
Kageyama, H ;
Nakamura, O ;
Inaba, Y ;
Kanno, R ;
Takagi, M ;
Takeda, Y .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1997, 144 (07) :L177-L180
[2]  
BONNET B, 1992, MAT SCI FORUM, V0091
[3]  
Graeve R., 1964, J CHEM EDUC, V41, P279
[4]   Synthesis of highly crystalline and monodisperse maghemite nanocrystallites without a size-selection process [J].
Hyeon, T ;
Lee, SS ;
Park, J ;
Chung, Y ;
Bin Na, H .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2001, 123 (51) :12798-12801
[5]   STUDY ON ELECTROCHEMICAL SODIUM DEINTERCALATION OF ALPHA-NAXFEO2 [J].
IMANISHI, N ;
NAKAHARA, K ;
TAKEDA, Y ;
YAMAMOTO, O ;
TAKANO, M .
DENKI KAGAKU, 1993, 61 (12) :1451-1452
[6]   LITHIUM INSERTION INTO FE3O4 [J].
ISLAM, MS ;
CATLOW, CRA .
JOURNAL OF SOLID STATE CHEMISTRY, 1988, 77 (01) :180-189
[7]   A Rietveld-analysis program RIETAN-98 and its applications to zeolites [J].
Izumi, F ;
Ikeda, T .
EUROPEAN POWDER DIFFRACTION, PTS 1 AND 2, 2000, 321-3 :198-203
[8]   Synthesis, structure, and electrochemical properties of a new lithium iron oxide, LiFeO2, with a corrugated layer structure [J].
Kanno, R ;
Shirane, T ;
Kawamoto, Y ;
Takeda, Y ;
Takano, M ;
Ohashi, M ;
Yamaguchi, Y .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (08) :2435-2442
[9]   Nano-sized-γ-Fe2O3 as lithium battery cathode [J].
Kanzaki, S ;
Inada, T ;
Matsumura, T ;
Sonoyama, N ;
Yamada, A ;
Takano, M ;
Kanno, R .
JOURNAL OF POWER SOURCES, 2005, 146 (1-2) :323-326
[10]   Synthesis of nanocrystalline Fe2O3 for lithium secondary battery cathode [J].
Komaba, S ;
Suzuki, K ;
Kumagai, N .
ELECTROCHEMISTRY, 2002, 70 (07) :506-510