| Synthesis and Electrochemical Characterization of Gradient Composite LiNi1-yCoyO2 Used as Cathode Materials in Lithium-ion Battery |
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| 作者姓名： | 赵煜娟 夏定国 刘庆国 |
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| 作者单位： | [1]CollegeofEnvironmentalandEnergyEngineering,BeijingUniversityofTechnology,Beijing100022,China [2]LaboratoryofSolidStatelonics,UniversityofScienceandTechnologyBeijing,Beijing100083,China |
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| 摘 要： | Gradient composites, LiNi1-yCoyO2, are synthesized from coated spherical Ni(OH)2 precursor. These composites could be applied as new cathode materials in lithium-ion batteries because they have low cobalt content (y≤0.2)and exhibit excellent properties during high-rate charge/discharge cycles. The initial discharge capacity of coated composite of LiNio.95Co0.05O2 is 186 mAh/g, and the decreasing rate of the capacity is 3.2% in 50 cycles at 1C rate. It has been verified by TEM and EDX experiments that a core-shell structure of the composite particles develops because of the cobalt enrichment near the surfaces, and the formation of the cobalt enrichment layer is sensitive to sintering temperature. High cobalt surface concentration may reduce the undesired reactions and stabilize the structure of the particles.
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| 关 键 词： | 合成 电化学特性 锂离子电池 阳极材料 锂镍钴复合氧化物 钴浓度 |
Synthesis and Electrochemical Characterization of Gradient Composite LiNi_(1-y)Co_yO_2 Used as Cathode Materials in Lithium-ion Battery |
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| ZHAO,Yu-Juan XIA,Ding-Guoa LIU,Qing-Guo College of Environmental and Energy Engineering,Beijing University of Technology,Beijing ,China bLaboratory of Solid State Ionics,University of Science and Technology Beijing,Beijing ,China.Synthesis and Electrochemical Characterization of Gradient Composite LiNi1-yCoyO2 Used as Cathode Materials in Lithium-ion Battery[J].Chinese Journal of Chemistry,2004,22(10):1148-1152. |
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| Authors: | ZHAO Yu-Juan XIA Ding-Guoa LIU Qing-Guo College of Environmental and Energy Engineering Beijing University of Technology Beijing China bLaboratory of Solid State Ionics University of Science and Technology Beijing Beijing China |
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| Institution: | ZHAO,Yu-Juan XIA,Ding-Guoa LIU,Qing-Guo College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100022,China bLaboratory of Solid State Ionics,University of Science and Technology Beijing,Beijing 100083,China |
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| Abstract: | Gradient composites, LiNi1?yCoyO2, are synthesized from coated spherical Ni(OH)2 precursor. These composites could be applied as new cathode materials in lithium‐ion batteries because they have low cobalt content (y≤0.2) and exhibit excellent properties during high‐rate charge/discharge cycles. The initial discharge capacity of coated composite of LiNi0.95O2 is 186 mAh/g, and the decreasing rate of the capacity is 3.2% in 50 cycles at 1 C rate. It has been verified by TEM and EDX experiments that a core‐shell structure of the composite particles develops because of the cobalt enrichment near the surfaces, and the formation of the cobalt enrichment layer is sensitive to sintering tempera‐. High cobalt surface concentration may reduce the undesired reactions and stabilize the structure of the particles. |
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| Keywords: | lithium-ion battery cathode material gradient material lithium nickel oxide cobalt concentration |
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