SiC@CNFs锂离子电池负极材料的制备及其循环性能研究

王鑫; 汪丽莉; 刘烨

doi:10.12299/jsues.22-0038

SiC@CNFs锂离子电池负极材料的制备及其循环性能研究

doi: 10.12299/jsues.22-0038

上海工程技术大学数理与统计学院, 上海 201620

详细信息

作者简介:
王鑫：王　鑫（1997−），女，在读硕士，研究方向为锂离子电池负极材料. E-mail：1379670382@qq.com

通讯作者:
汪丽莉（1981−），女，讲师，博士，研究方向为能源材料. E-mail：llwang@sues.edu.cn

中图分类号: TQ152; TM242
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出版历程
- 收稿日期: 2022-02-27
- 刊出日期: 2023-06-20

Study on preparation and cycling performance of anode materials for SiC@CNFs lithium-ion battery

School of Mathematics, Physics and Statistics, Shanghai University of Engineering Science, Shanghai 201620, China

摘要

摘要: 通过静电纺丝技术结合碳化工艺制备一种SiC增强碳纳米纤维（SiC@CNFs）复合结构. TGA、XRD、XPS及SEM的样品测试结果显示，SiC颗粒含量（质量分数，全文同）为62%，且均匀分布于CNFs的表面. 该结构制备的锂离子电池负极材料既保留了CNFs的高导电性，又获得了SiC增强的结构韧性. 电化学性能测试结果表明，将其作为锂离子电池负极材料，循环500次后，容量保留率高达134.01%，远高于CNFs. 同时，该结构的电化学阻抗值变化较小，导电性能保持较好. 通过静电纺丝技术制备的SiC@CNFs结构作为锂离子电池负极材料，制作成本低，结构可控且性能稳定，是目前对电池负极材料的有益补充.
- 锂离子电池 /
- 负极材料 /
- 碳纳米纤维 /
- 碳化硅 /
- 静电纺丝
Abstract: A SiC-enhanced carbon nanofiber composite (SiC@CNFs) structure was prepared by electrospinning technology combined with carbonization process. The results of TGA, XRD, XPS and SEM show that the mass fraction of SiC particles is 62%, and it is evenly distributed on the surface of CNFs. The lithium-ion battery anode material prepared by this structure not only retains the high electrical conductivity of CNFs, but also obtains the enhanced structural toughness of SiC. The electrochemical performance test results show that the capacity retention rate of the lithium-ion battery anode material is as high as 134.01% after 500 cycles, much higher than that of CNFs. Moreover, the electrochemical impedance value of the structure changes less and the conductivity of SiC@CNFs remains good. SiC@CNFs structures prepared by electrospinning technology serve as lithium-ion battery anode, with low production cost, controllable structure and stable performance, which is a beneficial supplement to the current battery cathode materials.
- lithium-ion battery /
- anode material /
- carbon nanofibers /
- silicon carbide /
- electrospinning

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图 1 SiC@CNFs制备工艺流程图

Figure 1. Preparation process flow chart of SiC@CNFs

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图 2 样品的XRD及XPS图

Figure 2. XRD and XPS diagrams of samples

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图 3 样品的热重分析图

Figure 3. TGA diagrams of samples

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图 4 样品的SEM图

Figure 4. SEM diagrams of samples

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图 5 样品的CV及初始充放电容量测试图

Figure 5. CV and the initial charge and discharge capacity diagrams of samples

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图 6 样品的循环性能测试图

Figure 6. Circular performance diagrams of samples

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图 7 样品的电化学阻抗谱图

Figure 7. EIS of samples

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表 1 SiC、SiC@CNFs和CNFs样品循环性能对比

Table 1. Comparison of cycle performance of SiC, SiC@CNFs and CNFs samples

样品	碳含量/%	初始放电比容量/ (mAh•g⁻¹)	循环5次后放电比容量/ (mAh•g⁻¹)	循环500次后放电比容量/ (mAh•g⁻¹)	容量保留率/%
CNFs	100	534.42	215.21	62.73	29.15
SiC@CNFs	38	417.08	137.42	184.15	134.01
SiC	0	64.02	28.71	72.41	396.49

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表 2 样品在初始状态和500次循环后的状态下的电阻值

Table 2. Resistance values for samples at the initial and 500-cycled states

样品	初始状态		循环500次后
样品	R₁/Ω	R_ct /Ω	R₁/Ω	R_ct /Ω
CNFs	4.14	18.65	24.51	56.88
SiC@CNFs	3.11	11.39	7.89	20.49
SiC	4.42	82.81	4.36	20.89

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