| 石墨相氮化碳表面包覆改善锂离子电池正极材料LiCoO2电化学性能的研究 |
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| 引用本文： | 毛立浩,薛亚楠,周云龙,左元慧,康诗飞,崔立峰.石墨相氮化碳表面包覆改善锂离子电池正极材料LiCoO2电化学性能的研究[J].上海理工大学学报,2018,39(2):28-34. |
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| 作者姓名： | 毛立浩 薛亚楠 周云龙 左元慧 康诗飞 崔立峰 |
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| 作者单位： | 上海理工大学 材料科学与工程学院, 上海 200093,上海理工大学 材料科学与工程学院, 上海 200093,上海理工大学 环境与建筑学院, 上海 200093,上海理工大学 环境与建筑学院, 上海 200093,上海理工大学 环境与建筑学院, 上海 200093,上海理工大学 环境与建筑学院, 上海 200093 |
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| 基金项目： | 国家自然科学基金项目（51671136） |
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| 摘 要： | 通过简单的固相法和液相法，分别制备出石墨相氮化碳（g-C3N4）表面改性的商品化LiCoO2复合材料，采用扫描电子显微镜观察改性后的材料，发现g-C3N4都均匀地包裹在LiCoO2表面。两种g-C3N4-LiCoO2复合材料被用作锂离子电池的正极材料，电化学测试结果显示，固相法制得的g-C3N4-LiCoO2复合材料在0.2 C的倍率下充放电测试，首次比容量达167 mA·h·g-1，循环80次后，比容量仍达132 mA·h·g-1，高于未经g-C3N4包裹的纯LiCoO2（98 mA·h·g-1）；液相法制得的Y-C3N4-LiCoO2复合材料循环稳定性明显优于同类材料，循环80次后容量保持率均在95%以上。试验证实，g-C3N4表面改性的策略具有一定的实用价值，改性后，材料优异的电化学性能归因于g-C3N4的包裹处理，这不仅增强了固体电解质界面（SEI）的稳定性，也抑制了锂离子嵌入/脱出电极材料时引起LiCoO2体积的变化。
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| 关 键 词： | LiCoO2 石墨相氮化碳 自组装包裹 锂离子电池 正极材料 |
| 收稿时间： | 2017/10/21 0:00:00 |
Critical Influence of Graphitic Carbon Nitride Coating on the Electrochemical Performance Improvement of LiCoO2 Composite Cathode Material for Lithium Ion Battery |
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| MAO Lihao,XUE Yanan,ZHOU Yunlong,ZUO Yuanhui,KANG Shifei and CUI Lifeng.Critical Influence of Graphitic Carbon Nitride Coating on the Electrochemical Performance Improvement of LiCoO2 Composite Cathode Material for Lithium Ion Battery[J].Journal of University of Shanghai For Science and Technology,2018,39(2):28-34. |
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| Authors: | MAO Lihao XUE Yanan ZHOU Yunlong ZUO Yuanhui KANG Shifei and CUI Lifeng |
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| Institution: | School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China,School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China,School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China,School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China,School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China and School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China |
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| Abstract: | Graphitic carbon nitride(g-C3N4) coated LiCoO2 composite was prepared by simple solid phase method and liquid phase method.Scanning electron microscopy reveals that both composites were uniformly coated by g-C3N4.The g-C3N4-LiCoO2 composite was used as high capacity cathode material for lithium ion battery.G-C3N4-LiCoO2 cathode material synthesized by solid phase method displayed remarkable higher initial discharge capacity(167 mA·h·g-1) and reversible capacity(132 mA·h·g-1) compared to pure LiCoO2(98 mA·h·g-1) at 0.2 C rate after 80 cycles.Y-C3N4-LiCoO2 cathode material synthesized by liquid phase method shows excellent cycling stability capacity retention of 95% at 0.2 C rate after 80 cycles.And the feasibility of the g-C3N4 surface coating strategy was verified by above tentative experiments.The significantly improved electrochemical properties of g-C3N4-LiCoO2 composite can be attributed to g-C3N4 coating treatment,which not only enhanced the stability of the solid-electrolyte-interface(SEI) film but also acted as a buffer layer for the large volume change of LiCoO2 particles during lithium intercalation and deintercalation. |
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| Keywords: | LiCoO2 graphitic carbon nitride coating lithium ion battery cathode material |
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