التفاصيل البيبلوغرافية
| العنوان: |
Sn 量子点/石墨烯复合材料的合成及 储锂性能. (Chinese) |
| Alternate Title: |
Synthesis and lithium storage properties of Sn quantum dots/graphene composite. (English) |
| المؤلفون: |
沈丁, 储诚议, 王来贵, 董伟, 刘耀汉, 李明月, 杨绍斌 |
| المصدر: |
Acta Materiae Compositae Sinica; Mar2021, Vol. 38 Issue 3, p863-870, 8p |
| مصطلحات موضوعية: |
COMPOSITE materials, GRAPHENE oxide, CHEMICAL reduction, CHEMICAL stability |
| Abstract (English): |
The Sn-based materials have been a focus as promising high-capacity electrode materials of lithium-ion battery. However, its poor cycling performance has severely restricted the large-scale practical applications. The Sn quantum dot/graphene (SnQds/rGO) composite electrode material was synthesized by chemical reduction method, using graphene oxide as the carrier. The Sn quantum dots with <10 nm were uniformly loaded on the surface of graphene. The experimental results show that the SnQds/rGO composite with Sn mass fraction of 90wt% has good comprehensive electrochemical performance. The first discharge capacity and Coulomb efficiency of the SnQds/rGO composite are 939 mAh/g and 66.6%, respectively. It's discapacity can reach 621 mAh/g after 200 cycles and the capacity retention rate is 66.1%. The structure stability of SnQds/rGO composite is improve, meanwhile its impedance reduce, owing to the commposite of small size Sn quantum dots and graphenethe. As a result, the cycle performance and rate performance of the SnQds/rGO composite have been significantly improved. However, the initial Coulomb efficiency of SnQds/rGO composite decreases. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
Sn 基材料是目前高容量锂离子电池电极材料研究的热点，但循环性能较差阻碍了其大规模应用。以 氧化石墨烯为载体，通过化学还原法在载体表面成功均匀负载<10 nm 的 Sn 量子点，合成 Sn 量子点/石墨烯 (SnQds/rGO) 复合电极材料。结果表明，Sn 质量分数为 90wt% 的 SnQds/rGO 复合材料具有良好的综合电化 学性能，首次放电容量和库伦效率分别为 939 mAh/g 和 66.6%，经过 200 次循环后容量可达 621 mAh/g，容 量保持率为 66.1%。小尺寸的 Sn 量子点与石墨烯复合能够增强电极材料的结构稳定性和降低阻抗，改善电极 材料的循环性能和倍率性能，但会导致首次库伦效率有所降低. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
