| 硅化镁还原CO2一步原位合成Si/C复合负极 |
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| 引用本文： | 石永刚,张志勇,陈彬,宋文龙,梁初,黄辉. 硅化镁还原CO2一步原位合成Si/C复合负极[J]. 复合材料学报, 2021, 38(10): 3522-3528. DOI: 10.13801/j.cnki.fhclxb.20210215.001 |
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| 作者姓名： | 石永刚 张志勇 陈彬 宋文龙 梁初 黄辉 |
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| 作者单位： | 1.浙江工业大学 材料科学与工程学院，杭州 310014 |
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| 基金项目： | 国家自然科学基金(51677170)；浙江省自然科学基金(LY18B030008) |
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| 摘 要： | 硅碳(Si/C)负极被认为是高能量密度锂离子电池的首选负极材料，本文提出了一种利用Mg2Si一步还原CO2原位制备硅碳复合材料的新方法，研究了Ar∶CO2混合气体积比和反应温度等关键工艺对Si/C负极材料微结构和电化学性能的影响。研究发现，该方法原位合成的Si/C颗粒尺寸为几百纳米，晶态硅和无定形碳相互交织、分布均匀。当反应温度为700℃、Ar∶CO2=7∶1时合成的Si/C复合材料作为锂离子电池负极材料时，在0.2 A/g的电流密度下，500个循环后仍有1134 mA·h/g可逆容量。本文利用温室气体CO2来制备储能用Si/C复合负极材料，既能实现变废为宝，同时该方法合成工艺简便，容易工业化实施，具有商业化开发的潜力。
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| 关 键 词： | 硅碳负极 CO2 Mg2Si 锂离子电池 原位合成 电化学性能 |
| 收稿时间： | 2020-11-24 |
In-situ synthesis of Si/C composites anode by one-step reduction of CO2 with magnesium silicide |
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| Affiliation: | 1.College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China2.Zhejiang Tianneng Shuaidefu Energy Technology CO. LTD., Changxing 313100, China |
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| Abstract: | Silicon/carbon (Si/C) anode is considered as a promising anode material for high-density lithium ion batteries. In the present work, a novel strategy to in-situ synthesize Si/C composites by one-step reduction of CO2 with Mg2Si was proposed. The effects of volume ratio of Ar∶CO2 mix gas and the reaction temperature on the microstructure and electrochemical properties of the synthesized Si/C were investigated. It is found that crystalline Si and amorphous C are interwoved each other in the Si/C particles with the size of about several nanometers. As anode materials for lithium ion batteries, the Si/C composites synthesized at 700℃ under the Ar∶CO2 gas ratio of 7∶1 exhibit a high capacity of 1134 mA·h/g over 500 cycles at a current density of 0.2 A/g. This study provides an avenue to synthesize Si/C energy storage materials from greenhouse CO2 gas with the merits of facile operation procedure, easy large-scale production and potential commercial applications. |
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