Unlocking the Potential of 2D MoS<sub>2</sub> Cathodes for High‐Performance Aqueous Al‐Ion Batteries: Deciphering the Intercalation Mechanisms
Wending Pan, Yulong Zhang, Kee Wah Leong, Yingguang Zhang, Jianjun Mao, Yifei Wang, Xiaolong Zhao, Shijing Luo, Dennis Y.C. Leung
Abstract
Abstract In recent years, there have been significant advancements in Al‐ion battery development, resulting in high voltage and capacity. Traditionally, only carbon‐based materials with layered structures and strong bonding capabilities can deliver superior performance. However, most other materials exhibited low discharge voltages of 1.4 V, especially in aqueous Al‐ion battery systems lacking anion intercalation. Thus, the development of high‐voltage cathode materials has become crucial. This study introduces 2D MoS 2 as a high‐performance cathode for aqueous Al‐ion batteries. The material's interlayer structure enables the intercalation of AlCl 4 − anions, resulting in high‐voltage intercalation. The resulting battery achieved a high voltage of 1.8 V with a capacity of 750 mAh g −1 , contributing to a high energy density of 890 Wh kg −1 and an impressive retention rate of ≈100% after 200 cycles. This research not only sheds light on the high‐voltage anion‐intercalation mechanism of MoS 2 but also paves the way for the further development of advanced cathode materials in the field of Al‐ion batteries. By demonstrating the potential of using 2D MoS 2 as a cathode material, this finding can lead to the development of more efficient and innovative energy storage technologies, ultimately contributing to a sustainable and green energy future.