Superlattice‐Stabilized WSe2 Cathode for Rechargeable Aluminum Batteries

Abstract Rechargeable aluminum batteries (RABs), with abundant aluminum reserves, low cost, and high safety, give them outstanding advantages in the postlithium batteries era. However, the high charge density (364 C mm −3 ) and large binding energy of three‐electron‐charge aluminum ions (Al 3+ ) de‐intercalation usually lead to irreversible structural deterioration and decayed battery performance. Herein, to mitigate these inherent defects from Al 3+ , an unexplored family of superlattice‐type tungsten selenide‐sodium dodecylbenzene sulfonate (SDBS) (S‐WSe 2 ) cathode in RABs with a stably crystal structure, expanded interlayer, and enhanced Al‐ion diffusion kinetic process is proposed. Benefiting from the unique advantage of superlattice‐type structure, the anionic surfactant SDBS in S‐WSe 2 can effectively tune the interlayer spacing of WSe 2 with released crystal strain from high‐charge‐density Al 3+ and achieve impressively long‐term cycle stability (110 mAh g −1 over 1500 cycles at 2.0 A g −1 ). Meanwhile, the optimized S‐WSe 2 cathode with intrinsic negative attraction of SDBS significantly accelerates the Al 3+ diffusion process with one of the best rate performances (165 mAh g −1 at 2.0 A g −1 ) in RABs. The findings of this study pave a new direction toward durable and high‐performance electrode materials for RABs.