锂离子电池负极材料多孔硅/硅铁合金的制备及性能

于志辉; 刘丹丹; 寇艳娜

doi:10.11936/bjutxb2016010005

锂离子电池负极材料多孔硅/硅铁合金的制备及性能

doi: 10.11936/bjutxb2016010005

北京工业大学区域大气复合污染防治北京市重点实验室, 北京 100124

基金项目: 国家“863”计划资助项目(2012AA052201)；北京市教育委员会科研计划面上资助项目(KM201210005008)；北京市教育委员会科技发展计划重点资助项目(KZ201310005001)

详细信息

作者简介:
作者简介: 于志辉(1961—), 女, 教授, 主要从事电化学方面的研究, E-mail:yuzhihui@bjut.edu.cn

中图分类号: O646
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出版历程
- 收稿日期: 2016-01-05
- 网络出版日期: 2022-09-13
- 刊出日期: 2017-02-01

Preparation and Pproperties of Si/Si-Fe Alloy Porous Composite as Anode Material in Lithium-ion Battery

Key Laboratory of Beijing on Regional Air Pollution Control, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

摘要

摘要: 为改善锂离子电池硅负极材料的电化学性能,利用镁热还原法制备了不同铁掺杂量的多孔硅/硅铁合金复合材料,并对其结构以及在锂离子电池中的充放电性能进行了研究. 材料均呈现多孔结构,硅铁合金均匀分布在孔道内部. 多孔硅/硅铁合金复合材料具有较好的循环稳定性,在0.1C倍率下循环100圈后可逆容量为1133.5mA·h/g,容量保持率为66%;在1C倍率下可逆容量仍可以达到776.9mA·h/g.
- 锂离子电池 /
- 多孔结构 /
- 硅铁合金 /
- 循环稳定性
Abstract: In order to modify the electrochemical properties of Si anode for lithium ion batteries, a series of porous Si/Si-Fe alloy composites with different amounts of Fe doping were prepared by magnesium reduction process. The morphology and microstructure of the as-prepared composites were investigated. The electrochemical performance of the composites as anode materials for lithium-ion batteries were evaluated by galvanostatical charge-discharge testing.The composites show a porous structure with the uniform distribution of Si-Fe alloy inside the pores and possess remarkable cycle stability with a capacity of 1133.5mA·h/g at 0.1C after 100 cycles, a capacity retention ratio of 66% and a reversible capacity of 776.9mA·h/g at 1C.
- lithium-ion battery /
- porous structure /
- Si-Fe alloy /
- cycle stability
The authors have declared that no competing interests exist.

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图 1 硅铁合金复合材料的X射线衍射图谱(右图为25°~60°区间的放大图)

Figure 1. XRD patterns for the samples p-Fe_xSi (the right pattern is the magnification of 25° to 60°)

下载: 全尺寸图片幻灯片

图 2 样品p-Si、p-Fe_0.04Si、p-Fe_0.05Si、p-Fe_0.1Si的SEM图

Figure 2. SEM for p-Si, p-Fe_0.04Si,p-Fe_0.05Si,p-Fe_0.1Si

下载: 全尺寸图片幻灯片

图 3 样品p-Si、p-Fe_0.05Si的TEM图及p-Fe_0.05Si的eds图谱

Figure 3. TEM for p-Si, p-Fe_0.05Si and energy spectrum analysis diagram for sample p-Fe_0.05Si

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图 4 不同铁掺杂量的多孔硅基材料的充放电曲线

Figure 4. Discharge/charge curves of the p-Fe_xSi

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图 5 p-Fe_0.05Si的循环伏安曲线

Figure 5. Cyclic voltammetry of the p-Fe_0.05Si

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图 6 不同铁掺杂量的多孔硅基材料的循环性能

Figure 6. Cyclic performances of the p-Fe_xSi at current density 420mA/g

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图 7 p-Si、p-Fe_0.05Si材料的倍率性能

Figure 7. Rate performance of p-Si、p-Fe_0.05Si

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表 1 硅铁合金复合材料在0.1C倍率420mA/g电流密度下的循环性能

Table 1. Form about cyclic performances of the p-Fe_xSi alloy composite electrodes at current density 420mA/g (0.1C)

样品	首次放电容量/(mA·h·g^-1)	首次充电容量/(mA·h·g^-1)	首次库伦效率/%	循环100圈后可逆容量/(mA·h·g^-1)	循环100圈后的容量保持率/%
A	2998.33	1503.3	50.1	845.5	56.2
B	2487.52	1555.7	62.5	961.8	61.8
C	2641.33	1716.7	65.0	1133.5	66.0
D	1883.54	1003.7	53.2	533.2	53.1
E	1649.98	889.2	53.9	471.5	53.0
注:样品A是P-Si,样品B是p-Fe_0.04Si,样品C是p-Fe_0.05Si,样品D是p-Fe_0.067Si,样品E是p-Fe_0.1Si.

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