| 锂离子电池用非晶硅薄膜负极材料的研究 | |
| Amorphous Silicon Film Anode for Lithium-ion Battery | |
| 摘要: 采用磁控溅射法在铜箔集流体上沉积得到了厚度约2 μm的非晶硅薄膜。X-射线衍射(XRD)、高分辨率透射电镜(HRTEM)和选区电子衍射(SAED)分析表明，该薄膜为非晶态。扫描电镜(SEM)结果表明，该硅电极在电化学吸、放锂循环后体积膨胀率为300%，但电池依然保持良好的循环寿命。在1.5～0.005 V (vs Li+/Li)和0.1 mA·cm-2条件下，该薄膜电极循环100 次后容量仍能保持在0.47 mAh·cm-2以上，为初始容量的84%。每周容量衰减率仅为初周的0.16%。HRTEM和SAED结果表明，该薄膜在电化学吸、放锂循环后仍为非晶态，这可能是其具有良好电化学循环寿命的主要原因。 | |
| 关键词: 锂离子电池 负极材料 非晶硅薄膜 磁控溅射 循环寿命 | |
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| Abstract: Amorphous silicon film with a thickness of up to 2 μm was deposited on copper substrate by magnetron sputtering. The X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) results indicate that the sputtered film has an amorphous structure. Although its volume expansion after prolonged electrochemical lithiation and delithiation cycles was up to 300% as observed from the scanning electron microscopy (SEM) image, this anode is still with a good cyclic life. In the potential range 1.5～0.005 V (vs Li+/Li) at the current density of 0.1 mA·cm-2, this film anode retains a capacity over 0.47 mAh·cm-2 after 100 cycles, which is 84% of its initial capacity. The capacity fade ratio was only 0.16% per cycle. The HRTEM and SAED results show that the film still retains the amorphous structure after cycling, which is believed to be beneficial for the electrochemical cycle life. | |
| Keywords: Li-ion battery anode material amorphous silicon film magnetron sputtering cycle life | |
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| 伏萍萍,宋英杰,张宏芳,杨化滨,周作祥,吴孟涛,黄来和,许刚.锂离子电池用非晶硅薄膜负极材料的研究[J].无机化学学报,2006,22(10):1823-1827. | |
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