A Non‐Flammable and Flexible Aluminum Derived Lithium‐Ion Storage Device with a Wide Temperature Range of Operation

Abstract With the rapid development and increasing popularity of electric vehicles and wearables, battery safety has become a leading focus in the field of energy storage research. Specifically, aluminum‐ion batteries are gaining increasing attention as low‐cost energy‐storage systems with high safety levels and theoretical energy density. However, the dense alumina passivation layer on the aluminum anode surface and slow kinetic performance of commonly used ionic liquid electrolytes still render poor performance. This report presents a new type of aluminum‐derived lithium‐ion battery (ALIB) that maintains a certain discharge performance under damaging conditions, including continuous bending, high‐ and low‐temperature environments, and shearing. This new ALIB effectively meets the current demand for flexible and wearable batteries. The prepared ALIB achieves a stable cycle of 130 mAh g −1 specific capacity and ≈260 Wh kg −1 theoretical energy density at a wide voltage platform of 2 V and a test temperature of 25 °C without undergoing combustion. Additionally, the study analyzes the reaction mechanism of this ALIB based on density functional theory and conducts ex situ XRD and XPS analyses to elucidate the underlying storage mechanism.