Physical and Life Sciences, Lawrence Livermore National Laboratory, Livermore, California94550, United States.
ACS Appl Mater Interfaces. 2022 Dec 14;14(49):54981-54991. doi: 10.1021/acsami.2c18396. Epub 2022 Nov 30.
Large-scale production of vertically aligned single-walled carbon nanotubes (VA-SWCNTs) on metal foils promises to enable technological advancements in many fields, from functional composites to energy storage to thermal interfaces. In this work, we demonstrate growth of high-quality (G/D > 6, average diameters ∼ 2-3 nm, densities > 10 cm) VA-SWCNTs on Inconel metal for use as a lithium-ion battery (LIB) anode. Scale-up of SWCNT growth on Inconel 625 to 100 cm exhibits nearly invariant CNT structural properties, even when synthesis is performed near atmospheric pressure, and this robustness is attributed to a growth kinetic regime dominated by the carbon precursor diffusion in the bulk gas mixture. SWCNT forests produced on large-area metal substrates at close to atmospheric pressure possess a combination of structural features that are among the best demonstrated so far in the literature for growth on metal foils. Leveraging these achievements for energy applications, we demonstrate a VA-SWCNT LIB anode with capacity >1200 mAh/g at 1.0C and stable cycling beyond 300 cycles. This robust synthesis of high-quality VA-SWCNTs on metal foils presents a promising route toward mass production of high-performance CNT devices for a broad range of applications.
在金属箔上大规模生产垂直排列的单壁碳纳米管（VA-SWCNT）有望推动许多领域的技术进步，从功能复合材料到储能到热界面。在这项工作中，我们展示了在 Inconel 金属上生长高质量（G/D>6，平均直径约为 2-3nm，密度>10cm）VA-SWCNT 作为锂离子电池（LIB）阳极的应用。SWCNT 在 Inconel 625 上的放大生长到 100cm 时，即使在接近大气压的条件下进行合成，CNT 的结构特性也几乎保持不变，这种稳健性归因于生长动力学状态，由在体气体混合物中的碳前体扩散主导。在接近大气压的大面积金属衬底上生长的 SWCNT 森林具有一系列结构特征，这些特征是迄今为止在文献中报道的金属箔生长中表现最好的特征之一。为了将这些成果应用于能源领域，我们展示了一种 VA-SWCNT LIB 阳极，其在 1.0C 时的容量超过 1200mAh/g，并且在超过 300 个循环后仍具有稳定的循环性能。这种在金属箔上高质量 VA-SWCNT 的稳健合成为广泛应用的高性能 CNT 器件的大规模生产提供了一条有前途的途径。
