| 三维碳微米网膜电极的锂电化学特征 |
| Electrochemical Properties of Three Dimensional Carbon Micro-Net Films with Lithium |
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| 摘要: 在无氧环境下热解具有一定图样的SU-8光刻胶，成功地制备高度有序的碳微米网薄膜(CMNFs)。TEM和SAED结构特性测试表明该CMNFs为晶态和无定形碳混合相。CMNFs薄膜首次放电容量可达到300 μAh·cm-2,在随后的循环中可逆容量保持在70 μAh·cm-2。通过比较CMNFs在充放电循环前后形貌的变化，可以发现CMNFs能够保持原有网状结构，但网格骨架发生膨胀。这种膨胀与CMNFs表面的固相电解质中间相(SEI)形成有关。CMNFs具有较好的循环稳定性显示了在将来三维锂电池中是一个非常有希望的负极材料。 |
| 关键词: CMNFs 高度有序 SU-8光刻胶 锂离子电池 |
| 基金项目: |
| Abstract: The highly ordered carbon micro-net films(CMNFs) have been successfully fabricated by pyrolyzing patterned SU-8 photoresist in inert atmosphere. Transmission electron microscopy and selected area electron diffraction measurements indicate that the CMNFs consist of the mixed phases of both crystalline and disordered carbon. The initial discharge capacity and and the reversible capacity of CMNFs are found to be 300 μAh·cm-2 and 70 μAh·cm-2, respectively. By comparing the morphology evolutions of the CMNFs before and after the electrochemical insertion and extraction of lithium, it can be seen that the originally net-like architecture of the CMNFs could be well kept but the gridding frameworks evidently expand after long-term electrochemical cycling. The large initial irreversibility and the heterogeneous widened sides of CMNFs could be associated with electrolyte reduction and the formation of a solid electrolyte interphase(SEI) on CMNFs surface after the first discharge process. The cycle stability of CMNFs makes it become a promising anode material in the future three dimentional rechargeable lithium batteries. |
| Keywords: CMNFs highly-ordered SU-8 photoresist Lithium ion batteries |
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| 刘方超,李驰麟,王保明,傅正文.三维碳微米网膜电极的锂电化学特征[J].无机化学学报,2009,25(7):1165-1169. |
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