Rechargeable quasi-solid-state aqueous hybrid Al3+/H+ battery with 10,000 ultralong cycle stability and smart switching capability
Hua Wang, Panpan Wang, Zhenyuan Ji, Zhe Chen, Jiaqi Wang, Wei Ling, Jie Liu, Mengmeng Hu, Chunyi Zhi, Yan Huang
Abstract
Safe and long lifespan batteries facilitate the development of portable electronics and electric vehicles. Owing to the low-cost, naturally abundance, and trivalent charge carrier of aluminum with the highest theoretical volumetric capacity, rechargeable aqueous aluminum-ion-based batteries are considered as promising next-generation secondary batteries. However, traditional electrolytes and frequent collapse of the host structure of electrode materials greatly jeopardize the cycle stability of the batteries. Here, we develop a novel hydrogel-based electrolyte coupled with stable layered intercalation electrodes for the first time to fabricate a highly safe and flexible rechargeable hybrid Al 3+ /H + battery. The as-fabricated hybrid-ion battery (HIB) delivers a high specific capacity of 125 mAh·g −1 at 0.1 A·g −1 and exhibits an unprecedented super long-term cycling stability with no capacity fading over 10,000 cycles at 2 A·g −1 . In addition, the hydrogel-based electrolyte possesses smart function of thermoresponsive switching, which can effectively prevent thermal runaway for the batteries. The unprecedented long cycle stability, highly intrinsic safety as well as low-cost indicate that the flexible aqueous HIBs are promising for applications.