3-氨基三乙氧基硅烷偶联剂 修饰Si基高性能锂离子电池负极材料

李肖; 宋燕; 田晓冬; 王凯; 郭全贵; 刘朗

3-氨基三乙氧基硅烷偶联剂修饰Si基高性能锂离子电池负极材料

李肖^1,2,
宋燕^2,,
田晓冬^1,2,
王凯^1,2,
郭全贵²,
刘朗²

1.
中国科学院大学, 北京 100049;
2.
中国科学院山西煤炭化学研究所, 中国科学院炭材料重点实验室, 山西太原 030001

基金项目: 山西省自然科学基金(2012011219-3);中国科学院山西煤炭化学研究所杰出青年人才项目.

详细信息

作者简介:
李肖,硕士研究生.E-mail:lx502118635@163.com

通讯作者:
宋燕,研究员.E-mail:yansong1026@126.com

中图分类号: TQ127.1⁺1
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- 被引次数: 0
出版历程
- 收稿日期: 2015-10-20
- 录用日期: 2016-01-05
- 修回日期: 2015-12-08
- 刊出日期: 2015-12-28

Surface-modified Si nanoparticles produced from 3- aminotriethoxysilane as an anode material for a high performance lithium-ion battery

1.
University of Chinese Academy of Sciences, Beijing 100049, China;
2.
Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

Funds: Natural Science Foundation of Shanxi Province (2012011219-3); Outstanding Young Talent Fund of Institute of Coal chemistry, Chinese Academy of Sciences.

摘要

摘要: 为了提高硅碳复合材料中硅的使用效率,使用3-氨基三乙氧基硅烷偶联剂(3-APTS)对硅纳米颗粒进行表面修饰,制备了3-APTS-Si@C/G复合材料。采用SEM、TEM、FT-IR、TGA、Raman等对材料微观形貌、结构及组分进行表征。结果表明,3-APTS对硅纳米颗粒有良好的分散作用,没有发现明显的硅颗粒团聚现象。3-APTS-Si@C/G复合材料呈现yolk-shell结构,其作为锂离子电池负极材料表现出优异的电化学性能。在100 mA·g^-1的电流密度下,首次可逆容量为1 699 mAh·g^-1,50次循环后可逆容量为913 mAh·g^-1,35次循环后容量保持率为99.6%,明显高于Si@C/G复合材料(首次可逆比容量为652.9 mAh·g^-1,50次循环之后可逆比容量为541 mAh·g^-1)。当电流密度达到1 500 mA·g^-1时,其可逆容量可达到480 mAh·g^-1。
- 锂离子电池 /
- 硅纳米颗粒 /
- 3-APTS-Si@C/G复合材料 /
- 循环稳定性
Abstract: 3-aminotriethoxysilane (3-APTS) was used to modify Si nanoparticles to improve the utilization rate of Si as an anode in a lithium ion battery. The structure, morphology and Si content were characterized by SEM, TEM, TGA, XRD, FT-IR, Raman spectroscopy. It is found that the 3-APTS-modified Si has a yolk-shell structure. 3-APTS plays an important role in the dispersion of Si nanoparticles and no obvious Si agglomeration is observed after the modification. The modified Si has an excellent electrochemical performance. The reversible capacity is 913 mAh·g^-1 after 50 cycles at a current density of 100 mAh·g^-1, the first coulombic efficiency is 62.9% and the retention capacity is 99.6% after 35 cycles. These values are better than for the unmodified Si whose initial reversible capacity is 652.9 mAh·g^-1 and 541 mAh·g^-1 after 50 cycles. Moreover, the reversible capacity of the modified Si has a capacity of 480 mAh·g^-1 at a high current density of 1 500 mAh·g^-1, indicating an excellent rate capability.
- Lithium-ion batteries /
- Si nanoparticle /
- 3-APTS-Si@C/G composite /
- Cycle performance

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