| 丁翔,黄丽华,纪敏,崔立峰.氮化碳自组装包裹对SnO2TiO2复合锂离子电池负极材料电化学性能的影响[J].有色金属材料与工程,2016,37(2):1-7. |
| 氮化碳自组装包裹对SnO2TiO2复合锂离子电池负极材料电化学性能的影响 |
| Critical Influence of Carbon Nitride Self-assembly Coating on the Electrochemical Performance of SnO2-TiO2 Nanocomposite Anode Material for Lithium Ion Battery |
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| DOI：10.13258/j.cnki.nmme.2016.02.001 |
| 中文关键词: SnO2 TiO2 石墨相氮化碳 自组装包裹 锂离子电池 负极材料 |
| 英文关键词:SnO2 TiO2 graphitic carbon nitride self-assembly coating lithium ion battery anode material |
| 基金项目:国家自然科学基金海外港澳学者合作研究基金项目(51528202) |
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| 中文摘要: |
| 通过简单的石墨相氮化碳(g-C3N4)纳米片自组装沉积法,制备了g-C3N4包裹的SnO2-TiO2纳米复合材料.扫描电子显微镜观察显示,g-C3N4均匀地包裹在SnO2-TiO2纳米颗粒上.SnO2-TiO2-C3N4纳米复合材料被用作锂离子电池的负极材料,在0.2C的倍率下循环20次后,比容量达到380.2 mA·h·g-1,明显高于未经g-C3N4包裹的纯的SnO2(51.6 mA·h·g-1)和SnO2-TiO2纳米复合材料.在0.1~0.5C的倍率充放电测试中,SnO2-TiO2-C3N4纳米复合材料的比容量仅从490 mA·h·g-1衰减到330 mA·h·g-1,高倍率下抗衰减性能优于同类材料.材料优异的电化学性能归功于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-脱出时SnO2和TiO2纳米颗粒的体积变化. |
| 英文摘要: |
| Graphitic carbon nitride(g-C3N4) coated SnO2-TiO2 nanocomposite was prepared by simple self-assembly deposition of g-C3N4 nanosheets on synthesized SnO2-TiO2 nanocomposite.Scanning electron microscopy reveals that g-C3N4 was uniformly coated on SnO2-TiO2 nanoparticles.The SnO2-TiO2-C3N4 nanocomposite was used as high capacity anode material for lithium ion battery and displayed remarkable higher capacity(380.2 mA·h·g-1) compared to both pure SnO2(51.6 mA·h·g-1) and SnO2-TiO2 nanocomposite(114.1 mA·h·g-1) at 0.2C rate after 20 cycles.Rate test of SnO2-TiO2-C3N4 nanocomposite implied a slight fading of specific discharge capacities from 490 mA·h·g-1 to 330 mA·h·g-1 at current rate range of 0.1-0.5C.The significantly improved electrochemical properties of SnO2-TiO2-C3N4 nanocomposites can be attributed to g-C3N4 coating treatment,which not only enhanced the stability of the solid-electrolyte-interface(SEI) film but also act as a buffer layer for the large volume change of SnO2-TiO2 nanoparticles during lithium intercalation. |
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