| 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].有色金属材料与工程,2018,39(2):28-34. |
| 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 |
| 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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| DOI：10.13258/j.cnki.nmme.2018.02.006 |
| 中文关键词: LiCoO2 石墨相氮化碳 自组装包裹 锂离子电池 正极材料 |
| 英文关键词:LiCoO2 graphitic carbon nitride coating lithium ion battery cathode material |
| 基金项目:国家自然科学基金项目（51671136） |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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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