A room temperature rechargeable Li–LiNO3 battery with high capacity

Lithium-ion batteries (LIBs) have become advanced energy storage technologies; however, specific capacity remains limited by the active materials in cathodes. Here, we report Li–LiNO3 batteries (LNBs) where LiNO3 in electrolyte serves as both active materials and ion conductor at room temperature. LNBs operate on a highly reversible redox between NO3− and NO2−, which results in an impressive areal capacity of 19 mAh cm−2 at a plateau voltage of 1.75 V. Furthermore, the pouch cell exhibits stable cycling at a capacity of 100 mAh. This research underscores the potential of LNBs for high-capacity energy storage.