Functionality of oxide coating for Li[Li0.05Ni0.4Co0.15Mn0.4]O2 as positive electrode materials for lithium-ion secondary batteries

被引：187
作者：
Myung, Seung-Taek
Izumi, Kentarou
Komaba, Shinichi
Yashiro, Hitoshi
Bang, Hyun Joo
Sun, Yang-Kook
Kumagai, Naoaki
机构：
[1] Iwate Univ, Dept Frontier Mat & Funct Engn, Grad Sch Engn, Morioka, Iwate 0208551, Japan
[2] Tokyo Univ Sci, Dept Appl Chem, Shinjuku Ku, Tokyo 1628601, Japan
[3] Iwate Univ, Dept Chem Engn, Morioka, Iwate 0208551, Japan
[4] Hanyang Univ, Dept Chem Engn, Seoul 133791, South Korea
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2007年 / 111卷 / 10期
关键词：
D O I：
10.1021/jp0674367
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-modified Li[Li0.05Ni0.4Co0.15Mn0.4]O-2 oxides were studied. The oxide particles were coated by heteroelements such as Al2O3, Nb2O5, Ta2O5, ZrO2 and ZnO. Metal oxide-coated Li[Li0.05Ni0.4Co0.15Mn0.4]O-2 did not show significant difference in X-ray diffraction patterns. Thickness of the formed coating layer was around 10 nm, as observed by transmission electron microscopy. Electrochemical properties of heteroelementcoated Li[Li0.05Ni0.4Co0.15Mn0.4]O-2 were investigated using coin type Li-ion cells employing graphite as an anode at 60 degrees C. Metal oxide-coated Li[Li0.05Ni0.4Co0.15Mn0.4]O-2 obviously showed higher capacity with good cyclability. Also, area-specific impedance was significantly lower for the metal oxide-coated Li[Li0.05Ni0.4Co0.15Mn0.4]O-2 during cycling, compared with that for bare Li[Li0.05Ni0.4Co0.15Mn0.4]O-2. Among them, Al2O3 coated Li [Li0.05Ni0.4Co0.15Mn0.4]O-2 had the best electrochemical performances. The metal oxide coating layer transformed to metal fluoride layer during cycling, as proved by time-of-flight-secondary ion mass spectroscopy. The newly formed metal fluoride layer would be greatly effective against HF attack during cycling. Possible reasons for the effectiveness of the metal oxide coating are discussed.
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页码：4061 / 4067
页数：7
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