| 锂离子电池Si@void@C复合材料的制备及其电化学性能 |
| Synthesis and Electrochemical Performance of Si@void@C Composite Anode Material for Lithium Ion Battery |
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| 摘要: 以纳米Si颗粒为核心，正硅酸四乙酯（TEOS）为SiO2源，采用Stober法在Si表面包覆一层SiO2，再以多巴胺为碳源，通过碳化处理将SiO2表面的聚多巴胺层转化成碳层。最后，用HF刻蚀SiO2并留下空隙，得到Si@void@C复合纳米颗粒。利用X射线衍射、扫描电镜、透射电镜和恒流充放电测试对材料的物相、微观形貌和电化学性能进行表征。结果表明，在0.1 A·g-1电流密度下，Si@void@C负极材料充放电循环100次后充电比容量仍然有1 319.5 mAh·g-1，容量保持率为78.4%，表现出优异的电化学性能。 |
| 关键词: 硅 碳包覆 Si@void@C负极材料 锂离子电池 |
| 基金项目: 国家自然科学基金（No.21263016，21363015，51662029）资助项目 |
| Abstract: The Si@void@C composites were prepared by a stober method with Si nanoparticles as the cores. This preparation process involved coating a SiO2 layer through hydrolyzing and self-assembly approach of TEOS, coating a carbon layer through in-situ polymerization and high temperature carbonization of dopamine, and etching SiO2 by HF. Crystalline structure, morphology and electrochemical performances of the composites were characterized by X-ray diffraction, scanning electron microscope, TEM and charge-discharge tests. The results indicate that the Si@void@C anode material retains a charge capacity of 1 319.5 mAh·g-1 at current density of 0.1 A·g-1 along with the capacity retention of 78.4% after 100 cycles, and shows an excellent electrochemical performance. |
| Keywords: silicon carbon coating Si@void@C anode material lithium ion battery |
| 投稿时间：2017-02-21 修订日期：2017-09-01 |
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| 蔡建信,李志鹏,李巍,赵鹏飞,杨震宇,吁霁.锂离子电池Si@void@C复合材料的制备及其电化学性能[J].无机化学学报,2017,33(10):1763-1768. |
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