当前位置:首页 >> 能源/化工 >>

网状碳纳米管纤维并应用在锂空电池上2


Copyright WILEY-VCH Verlag GmbH & Co. KGaA, 69469 Weinheim, Germany, 2012.

Supporting Information
for Adv. Mater., DOI: 10.1002/adma.201204018

Enhanced Power an

d Rechargeability of a Li?O2 Battery Based on a Hierarchical-Fibril CNT Electrode Hee-Dae Lim, Kyu-Young Park, Hyelynn Song, Eui Yun Jang, Hyeokjo Gwon, Jinsoo Kim, Yong Hyup Kim, Márcio D. Lima, Raquel Ovalle Robles, Xavier Lepró, Ray H. Baughman, and Kisuk Kang*

Submitted to Supporting Information

Figure S1. SEM images of highly aligned CNT fibrils at various magnifications. The twodimensional CNT sheets were cross-stacked with a 90° shift (inset of Figure S1d: TEM image of one string of a multi-wall CNT).

1

Submitted to

Figure S2. AFM images of a CNT fibril. One sheet of the CNT fibril was composed of hundreds of CNT bundles, and each bundle was made up of many CNT strings. One bundle of CNT is ~5 μm in thickness and 150 nm in height.

2

Submitted to

Figure S3. HR-TEM images of CNT strand. The MWNTs is 10-15 nm thick and composed of about 8-9 walls.

3

Submitted to

Figure S4. (a) The SEM image of single CNT sheet. (b) The thickness of the non-woven CNT powder electrode.

Figure S4a shows the SEM image of the single CNT sheet which is about 1.4 ?m thick. The thickness of the air electrode that is comprised of 10 sheets of CNT fibrils is approximately 14 ?m. The air electrode with non-woven CNT also has a similar thickness about 15 ?m (Figure RS4b). We also measured the loading densities of two electrodes and found they are 0.016 mg cm-2 for the aligned CNT electrode and 0.0166 mg cm-2 for the non-woven CNT electrode, respectively. This indicates that the porosities of the two electrodes are comparable and the primary difference of two electrodes comes from the distribution of pores and their individual sizes. This measurement strongly supports that the enhanced electrochemical performances were mainly originated from the unique electrode structure. Because the woven CNT electrode has uniform pores within the aligned structure, it is much beneficial to the facile accessibilities of oxygen and Li ions compared to the random pores of non-woven CNT electrode even in the same volume.

4

Submitted to

Figure S5. Cycle stability and Coulombic efficiency of Li?O2 cells at ultra-high current densities of 4,000 mA g?1 and 5,000 mA g?1.

5

Submitted to

Figure S6. Electron diffraction patterns of (a) an as-prepared electrode and (b) the electrode after the first discharge. The formation of Li2O2 was detected after the discharge.

6

Submitted to

Figure S7. EDS mapping of the CNT string after the first discharge: (a) original TEM image, (b) carbon elemental map, and (c) oxygen elemental map. EDS mapping was used to demonstrate the uniform coating of the discharge products on the CNT surface. The oxygen elemental mapping was thicker than that of the carbon, which indicates the uniform formation of an oxide on the entire CNT surface.

7

Submitted to

Figure S8. SEM images of the air electrode based on a woven CNT after 100 cycles at various magnifications. Many small beads were produced after 100 cycles. Nevertheless, it is worthwhile to note that the overall structure was maintained after many cycles.

8

Submitted to

Figure S9. (a) The HR-TEM image of the bead-like discharge products and (b) the electron diffraction patterns at the white rectangular region. It demonstrates that the particles were composed of Li2O2.

9

Submitted to

Figure S10. The TEM image of the bead-like discharge products. (a) The EDS and (b) the EELS spectra.

The figure above demonstrates that the bead particles were composed of oxygen element, while the F and P were from residual electrolyte and Ni was from Ni grid for TEM observation (Figure S10a). Because Li is not detected by EDS, we additionally investigated the existence of lithium through EELS spectra (electron energy loss spectroscopy, Figure S10b). The peak near ~56 eV confirms the existence of lithium in the bead particle. [1,2] These elemental analyses reveal again that the beads are Li2O2.

10

Submitted to [1] K. Rana, G. Kucukayan-Dogu, H. S. Sen, C. Boothroyd, O. Gulseren, E. Bengu, J. Phys. Chem. C 2012, 116, 11364. [2] X. H. Liu, J. W. Wang, Y. Liu, H. Zheng, A. Kushima, S. Huang, T. Zhu, S. X. Mao, J. Li, S. Zhang, W. Lu, J. M. Tour, J. Y. Huang, Carbon 2012, 50, 3836.

11


相关文章:
可充式锂空气电池
锂空气 电池是一个全新的概念,最近 1-2 年研究者...Zhang 等[9]利用单臂碳纳米管碳纤维制备的复合纸...应用在有机-水混合体系锂空气电池中,实 验证明,...
碳纳米管电池研究进展
2碳纳米管碳纳米管是由类似石墨结构的六边形网格卷绕而成的、中空的“微管”...碳 纳米管应用非常广泛: 可用于离子电池负极材料, 构建电双层电容器电极...
铅酸电池的碳材料
阻抗值, 说明 碳纤维的添加能一定程度上降低电池的...纳米可能起阻化剂作用。 2.1 碳黑 由于炭黑...2.1 网状玻璃态(RVC) RVC 是一种由玻璃态...
碳纳米管锂离子蓄电池
高比能量高安全性 碳纳米管锂离子蓄电池 技术路线规划书 一、项目介绍本项目技术路线规划书规划开发一种新型离子蓄电池,这种新型的离子蓄电池使 用碳纳米管...
更多相关标签:
碳纳米管 锂电池 | 碳纤维锂电池箱体 | 玻璃纤维 锂硫电池 | 碳纳米管纤维 | 碳纳米管石墨烯碳纤维 | 碳纤维和碳纳米管 | 碳纳米管碳纤维水泥 | 碳纳米管纤维 操作 |