| Surface modification of LiCo0. 05Mn1.95O4 cathode by coating with SiO2-TiO2 composite |
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| 作者姓名： | 禹筱元 胡国荣 彭忠东 肖劲 陈召勇 刘业翔 |
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| 作者单位： | School of Metallurgical Science and Engineering，Central South Univ ersity，School of Metallurgical Science and Engineering，Central South Univ ersity，School of Metallurgical Science and Engineering，Central South Univ ersity，School of Metallurgical Science and Engineering，Central South Univ ersity，School of Metallurgical Science and Engineering，Central South Univ ersity，School of Metallurgical Science and Engineering，Central South Univ ersity Changsha 410083，China，School of Chemistry and Chemical Engineering，Central South University，Changsha 410083，China，Changsha 410083，China，Changsha 410083，China，Changsha 410083，China，Changsha 410083，China，Changsha 410083，China |
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| 摘 要： | 1 INTRODUCTIONSincethefirstcommercializationbySonyCorpo rationintheearly 1990s ,thelithium ionbattery(LIB)hasbecomeamajorproducttodominatethemarketforsmallrechargeablebatteries .Further more ,Li ionbatteriesareexpectedtobeusedasalarge scaleenergystoragedeviceforelectricvehices(EV ) 1] .ThoughvarioustypesofcathodematerialssuchasLiCoO2 ,LiNiO2 ,LiMn2 O4 ,andsubstitutedtran sitionmetaloxidesarecurrentlyusedincommercial izedLi ionbatteries2 ,3] ,LiCoO2 inthesecathodematerialsismost…
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| 关 键 词： | SiO2-TiO2 复合涂层 表面改性 LiCo0.05Mn1.95O4 锂离子电池 电极材料 |
Surface modification of LiCo0.05Mn1.95O4 cathode by coating with SiO2-TiO2 composite |
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| YU Xiao-yuan.Surface modification of LiCo0. 05Mn1.95O4 cathode by coating with SiO2-TiO2 composite[J].Transactions of Nonferrous Metals Society of China,2004,14(4):723-727. |
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| Authors: | YU Xiao-yuan |
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| Affiliation: | YU Xiao-yuan~ |
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| Abstract: | The cycling characteristics and low specific capacity of LiMn2 O4 have always been the greatest obstacle to its commercialization. For the improvement of cycle performance, the surface of LiCo0.05 Mn1.95 O4 was coated with very fine SiO2-TiO2 composite prepared by sol-gel method. The structure and morphology of the coating materials were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). The electrochemical performances of uncoated and SiO2-TiO2 coated LiCo0.05 Mn1.95O4 spinel at 25 ℃ and 55 ℃ were studied with a voltage range of 3.0 - 4.35V and a current density of 0.1 mA/cm2. There is a slight decrease in the initial discharge capacity bility of LiCo0.05 Mn1.95 O4 coated by SiO2-TiO2 is improved. It is proposed that surface treatment is an effective method to improve the cycle performance of LiCo0. 05 Mn1.95O4. The surface modification is successful in minimizing the harmful side reactions within the batteries by placing a protective barrier layer between the oxidizing cathode material and the liquid electrolyte. |
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| Keywords: | lithium-ion batteries surface modification SiO2-TiO2 coating LiCo0 05Mn1 95O4cathode |
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