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Nb2CTx MXene Cathode for High-Capacity Rechargeable Aluminum Batteries with Prolonged Cycle Lifetime
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-09-27 , DOI: 10.1021/acsami.2c09765 Jiahui Li 1 , Fanshuai Zeng 2 , Jehad K El-Demellawi 3 , Qicai Lin 2 , Shengkun Xi 1 , Junwei Wu 1 , Jiancheng Tang 2 , Xixiang Zhang 3 , Xingjun Liu 1 , Shaobo Tu 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-09-27 , DOI: 10.1021/acsami.2c09765 Jiahui Li 1 , Fanshuai Zeng 2 , Jehad K El-Demellawi 3 , Qicai Lin 2 , Shengkun Xi 1 , Junwei Wu 1 , Jiancheng Tang 2 , Xixiang Zhang 3 , Xingjun Liu 1 , Shaobo Tu 2
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Aluminum-ion batteries have garnered significant interest as a potentially safer and cheaper replacement for conventional lithium-ion batteries, offering a shorter charging time and denser storage capacity. Nonetheless, the progress in this field is considerably hampered by the limited availability of suitable cathode materials that can sustain the reversible intercalation of Al3+/[AlCl4]− ions, particularly after long cycles. Herein, we demonstrate that rechargeable Al batteries embedded with two-dimensional (2D) Nb2CTx MXene as a cathode material exhibit excellent capacity and exceptional long cyclic performance. We have successfully improved the initial electrochemical performance of Nb2CTx MXene after being properly delaminated to a single-layered microstructure and subjected to a post-synthesis calcining treatment. Compared to pristine Nb2CTx MXene, the Al battery embedded with the calcined Nb2CTx MXene cathode has, respectively, retained high capacities of 108 and 80 mAh g–1 after 500 cycles at current densities of 0.2 and 0.5 A g–1 in a wide voltage window (0.1–2.4 V). Noteworthily, the cyclic lifetime of Nb2CTx MXene was extended from ∼300 to >500 times after calcination. We reveal that attaining Nb2CTx nanosheets with a controllable d-spacing has promoted the migration of the [AlCl4]− and Al3+ ions in the MXene interlayers, leading to enhanced charge storage. Furthermore, we found out that the formation of niobium oxides and amorphous carbon after calcination probably benefits the electrochemical performance of Nb2CTx MXene electrode in Al batteries.
中文翻译：
用于大容量可充电铝电池的 Nb2CTx MXene 阴极，可延长循环寿命
铝离子电池作为传统锂离子电池的潜在更安全和更便宜的替代品，具有更短的充电时间和更密集的存储容量，引起了人们的极大兴趣。尽管如此，该领域的进展受到可维持Al 3+ /[AlCl 4 ] -离子可逆嵌入的合适阴极材料的有限可用性的极大阻碍，特别是在长循环后。在此，我们证明了嵌入二维 (2D) Nb 2 CT x MXene 作为正极材料的可充电铝电池表现出优异的容量和出色的长循环性能。我们成功地提高了 Nb 2的初始电化学性能CT x MXene 在适当分层成单层微结构并进行合成后煅烧处理后。与原始 Nb 2 CT x MXene 相比，嵌入煅烧 Nb 2 CT x MXene 正极的铝电池在 0.2 和 0.5 A g 电流密度下循环 500 次后分别保持了 108 和 80 mAh g –1的高容量– 1在宽电压窗口 (0.1–2.4 V)。值得注意的是，煅烧后 Nb 2 CT x MXene 的循环寿命从 300 倍延长到 500 倍以上。我们揭示了达到 Nb 2 CT x具有可控d间距的纳米片促进了[AlCl 4 ] -和Al 3+离子在MXene中间层中的迁移，从而增强了电荷存储。此外，我们发现煅烧后铌氧化物和无定形碳的形成可能有利于铝电池中 Nb 2 CT x MXene 电极的电化学性能。
更新日期：2022-09-27
中文翻译：
用于大容量可充电铝电池的 Nb2CTx MXene 阴极，可延长循环寿命
铝离子电池作为传统锂离子电池的潜在更安全和更便宜的替代品，具有更短的充电时间和更密集的存储容量，引起了人们的极大兴趣。尽管如此，该领域的进展受到可维持Al 3+ /[AlCl 4 ] -离子可逆嵌入的合适阴极材料的有限可用性的极大阻碍，特别是在长循环后。在此，我们证明了嵌入二维 (2D) Nb 2 CT x MXene 作为正极材料的可充电铝电池表现出优异的容量和出色的长循环性能。我们成功地提高了 Nb 2的初始电化学性能CT x MXene 在适当分层成单层微结构并进行合成后煅烧处理后。与原始 Nb 2 CT x MXene 相比，嵌入煅烧 Nb 2 CT x MXene 正极的铝电池在 0.2 和 0.5 A g 电流密度下循环 500 次后分别保持了 108 和 80 mAh g –1的高容量– 1在宽电压窗口 (0.1–2.4 V)。值得注意的是，煅烧后 Nb 2 CT x MXene 的循环寿命从 300 倍延长到 500 倍以上。我们揭示了达到 Nb 2 CT x具有可控d间距的纳米片促进了[AlCl 4 ] -和Al 3+离子在MXene中间层中的迁移，从而增强了电荷存储。此外，我们发现煅烧后铌氧化物和无定形碳的形成可能有利于铝电池中 Nb 2 CT x MXene 电极的电化学性能。
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