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Nowadays, wearable energy storage devices have been growing rapidly, but flexible systems with both excellent cycling stability and decent flexibility are still challenging. In this work, a flexible all-solid-state NH 4 NiPO 4 ·H 2 O//graphene supercapacitor with remarkable performance was successfully assembled. When cycled at a current density of 5 mA cm −2 , the device delivered 121 mF cm −2 , and showed good cycling stability after 3,000 cycles. Moreover, the all-solid-state NH 4 NiPO 4 ·H 2 O//graphene supercapacitor also exhibit high mechanical flexibility with well-maintained specific capacitance, even under bending to arbitrary angles (up to 180°) and different weights (up to 50 g).

Mesoporous NH4NiPO4·H2O for High-Performance Flexible All-Solid-State Asymmetric Supercapacitors