Sn量子点/石墨烯复合材料的合成及储锂性能

沈丁; 储诚议; 王来贵; 董伟; 刘耀汉; 李明月; 杨绍斌

doi:10.13801/j.cnki.fhclxb.20200826.003

Sn量子点/石墨烯复合材料的合成及储锂性能

doi: 10.13801/j.cnki.fhclxb.20200826.003

沈丁^{1, 2,},
储诚议^1,,
王来贵²,
董伟^1,,
刘耀汉¹,
李明月¹,
杨绍斌^1, ,

1.
辽宁工程技术大学　材料科学与工程学院，阜新 123000
2.
辽宁工程技术大学　力学与工程学院，阜新 123000

基金项目: 国家自然科学基金(51874167；21808095)；博士后面上基金(2018M641707)

详细信息

通讯作者:
杨绍斌，博士，教授，博士生导师，研究方向为新能源材料和矿物材料　E-mail：lgdysb@163.com

中图分类号: TM911; O646
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- 文章访问数: 915
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- 被引次数: 0
出版历程
- 收稿日期: 2020-07-09
- 录用日期: 2020-08-19
- 网络出版日期: 2020-08-26
- 刊出日期: 2021-03-15

Synthesis and lithium storage properties of Sn quantum dots/graphene composite

SHEN Ding^{1, 2
,},
CHU Chengyi^1
,,
WANG Laigui²,
DONG Wei^1
,,
LIU Yaohan¹,
LI Mingyue¹,
YANG Shaobin^{1
, ,}

1.
College of Materials Science and Engineering, Liaoning Technical University, Fuxin 123000, China
2.
School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China

摘要

摘要: 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。
- 锂离子电池 /
- Sn量子点 /
- 石墨烯 /
- 储锂性能 /
- 化学还原法
Abstract: 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.
- lithium ion battery /
- Sn quantum dot /
- graphene /
- lithium storage property /
- chemical reduction method

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图 1 纳米Sn金属和Sn量子点/石墨烯(SnQds/rGO)复合材料的XRD图谱

Figure 1. XRD spetra of nano Sn alloy and Sn quantum dot/graphene (SnQds/rGO) composites

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图 2 纳米Sn金属和SnQds/rGO复合材料的SEM图像: (a) 纳米金属Sn; (b) 95wt% Sn; (c) 90wt% Sn; (d) 85wt% Sn; (e) 80wt% Sn

Figure 2. SEM of nano Sn alloy and SnQds/rGO composite: (a) Nano Sn alloy; (b) 95wt% Sn; (c) 90wt% Sn; (d) 85wt% Sn; (e) 80wt% Sn

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图 3 Sn质量分数为90wt%的SnQds/rGO复合材料的微观结构: (a) TEM image; (b) HRTEM image; (c) 选区电子衍射图谱

Figure 3. Microstructure of SnQds/rGO composite with mass fraction of 90wt%: (a) TEM; (b) HRTEM; (c) Selected area electron diffraction pattern

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图 4 SnQds/rGO复合材料的合成示意图

Figure 4. Schematic of synthesis of SnQds/rGO composite

GO—Graphene oxide; PVP—Polyvinyl pyrrolidone

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图 5 纳米Sn金属和SnQds/rGO复合材料的充放电曲线: (a)纳米Sn金属; (b) 95wt% Sn; (c) 90wt% Sn; (d) 85wt% Sn; (e) 80wt% Sn

Figure 5. Charge and discharge curves of nano Sn alloy and SnQds/rGO composites: (a) Nano Sn alloy; (b) 95wt% Sn; (c) 90wt% Sn; (d) 85wt% Sn; (e) 80wt% Sn

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图 6 纳米Sn金属和SnQds/rGO复合材料的循环性能和倍率性能:(a)循环性能; (b)库伦效率; (c)倍率性能

Figure 6. Cycle performance and rate performance of nano Sn alloy and SnQds/rGO composites: (a) Cycle performance; (b) Coulomb efficiency; (c) Multiplier performance

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图 7 纳米Sn金属(a)和Sn质量分数为90wt%的SnQds/rGO复合材料(b)的循环伏安曲线

Figure 7. Cyclic voltammetry curves of nano Sn alloy (a) and SnQds/rGO composite with Sn mass fraction of 90wt% (b)

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图 8 纳米Sn金属和Sn质量分数为90wt%的SnQds/rGO复合材料的交流阻抗曲线

Figure 8. Alternating current impedance curves of nano Sn alloy and SnQds/rGO composite with Sn mass fraction of 90wt%

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