Functionality of oxide coating for LiLi0.05Ni0.4Co0.15Mn0.4O-2 as positive electrode materials for lithium-ion secondary batteries

Myung  ST; Izumi  K; Komaba  SYashiro  HBang  HJSun  YKKumagai  N

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Functionality of oxide coating for LiLi0.05Ni0.4Co0.15Mn0.4O-2 as positive electrode materials for lithium-ion secondary batteries

机译：LiLi0.05Ni0.4Co0.15Mn0.4O-2作为锂离子二次电池正极材料的氧化物涂层功能

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Surface-modified LiLi0.05Ni0.4Co0.15Mn0.4O-2 oxides were studied. The oxide particles were coated by heteroelements such as Al2O3, Nb2O5, Ta2O5, ZrO2 and ZnO. Metal oxide-coated LiLi0.05Ni0.4Co0.15Mn0.4O-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 LiLi0.05Ni0.4Co0.15Mn0.4O-2 were investigated using coin type Li-ion cells employing graphite as an anode at 60 degrees C. Metal oxide-coated LiLi0.05Ni0.4Co0.15Mn0.4O-2 obviously showed higher capacity with good cyclability. Also, area-specific impedance was significantly lower for the metal oxide-coated LiLi0.05Ni0.4Co0.15Mn0.4O-2 during cycling, compared with that for bare LiLi0.05Ni0.4Co0.15Mn0.4O-2. Among them, Al2O3 coated Li Li0.05Ni0.4Co0.15Mn0.4O-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.

机译：研究了表面改性的Li[Li0.05Ni0.4Co0.15Mn0.4]O-2氧化物.氧化物颗粒被Al2O3、Nb2O5、Ta2O5、ZrO2和ZnO等异质元素包覆。金属氧化物包覆的Li[Li0.05Ni0.4Co0.15Mn0.4]O-2在X射线衍射图谱上没有显著差异。通过透射电子显微镜观察到，形成的涂层厚度约为 10 nm。以石墨为阳极的纽扣型锂离子电池为研究对象，在60°C下研究了杂元包覆Li[Li0.05Ni0.4Co0.15Mn0.4]O-2的电化学性能，金属氧化物包覆Li[Li0.05Ni0.4Co0.15Mn0.4]O-2表现出较高的容量和良好的循环性能。此外，与裸Li[Li0.05Ni0.4Co0.15Mn0.4]O-2相比，金属氧化物涂层Li[Li0.05Ni0.4Co0.15Mn0.4]O-2在循环过程中的面积比阻抗显著降低。其中，Al2O3包覆Li[Li0.05Ni0.4Co0.15Mn0.4]O-2的电化学性能最好。金属氧化物涂层在循环过程中转变为金属氟化物层，飞行时间-二次离子质谱证明了这一点。新形成的金属氟化物层将极大地有效防止循环过程中的高频侵蚀。讨论了金属氧化物涂层有效性的可能原因。

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《The journal of physical chemistry, C. Nanomaterials and interfaces》 |2007年第10期|4061-4067|共7页
作者
Myung ST; Izumi K; Komaba SYashiro HBang HJSun YKKumagai N;
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作者单位

Iwate Univ, Dept Frontier Mat & Funct Engn, Grad Sch Engn, Morioka, Iwate 0208551, Japan;

Tokyo Univ Sci, Dept Appl Chem, Shinjuku Ku, Tokyo 1628601, Japan;

Iwate Univ, Dept Chem Engn, Morioka, Iwate 0208551, JapanHanyang Univ, Dept Chem Engn, Seoul 133791, South KoreaLaboratoire de Recherche sur les Polymeres, UMR C7581 CNRS, 2-8 rue H Dunant, 94320 Thiais France;

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原文格式 PDF
正文语种英语
中图分类特种结构材料;表面现象的物理化学;
关键词
SURFACE MODIFICATION; ELECTROCHEMICAL PERFORMANCE; CATHODE MATERIALS; LICOO2; LI; GRAPHITE; NI; CO;

机译：表面改性;电化学性能;阴极材料;柠檬酸2;李;石墨;NI;一氧化碳;

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Functionality of oxide coating for LiLi0.05Ni0.4Co0.15Mn0.4O-2 as positive electrode materials for lithium-ion secondary batteries

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