Graphitic multi‐walled carbon nanotubes (MWCNTs) can function as high‐performance cathode materials for rechargeable Al‐ion batteries with well‐defined discharging plateaus and reasonable charge/discharge C‐rates. However, the main intercalation/deintercalation or adsorption/desorption path of AlCl₄⁻ anions into or onto G‐MWCNTs has not been elucidated. Herein, we used battery cells comprised of G‐MWCNTs with different aspect ratios, Al metal, and AlCl₃/1‐ethyl‐3‐methylimidazolium chloride ionic liquid as the cathode, anode, and electrolyte, respectively. The electrochemical performance of the Al||G‐MWCNT cell increased as the aspect ratio of the G‐MWCNT cathode increased (i. e., longer and thinner). The degree of defects of the G‐MWCNTs was similar (0.15–0.22); hence, the results confirm that the main and alternate paths for the AlCl₄⁻ intercalation/de‐intercalation or adsorption/desorption into/from or onto/from the G‐MWCNT are the basal and edge planes, respectively. The step‐like structures of defects on the basal plane provide the main reaction site for AlCl₄⁻ anions.

中文翻译：

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不同长径比石墨多壁碳纳米管作为铝离子电池正极材料的电化学性能。

石墨多壁碳纳米管（MWCNT）可以作为可充电铝离子电池的高性能正极材料，具有明确的放电平台和合理的充电/放电倍率。_{然而，AlCl 4} ^-阴离子进入G-MWCNTs或G-MWCNTs上的主要嵌入/脱嵌或吸附/解吸路径尚未阐明。_{在此，我们使用由不同长径比的G-MWCNT、Al金属和AlCl 3} /1-乙基-3-甲基咪唑氯化物离子液体组成的电池，分别作为正极、负极和电解质。Al||G-MWCNT 电池的电化学性能随着 G-MWCNT 阴极纵横比的增加（即更长和更薄）而增加。G-MWCNT 的缺陷程度相似（0.15-0.22）；因此，结果证实AlCl ₄ ^-嵌入/脱嵌或吸附/解吸到G-MWCNT中或之上/从G-MWCNT上的主要路径和替代路径分别是基底面和边缘面。基面缺陷的阶梯状结构为AlCl ₄ ^-阴离子提供了主要反应位点。