Metal–Organic Framework (MOF) Derived Electrodes with Robust and Fast Lithium Storage for Li‐Ion Hybrid Capacitors

• Published in: Advanced functional materials Vol. 29; no. 19
• Main Authors: Dubal, Deepak P., Jayaramulu, Kolleboyina, Sunil, Janaky, Kment, Štěpán, Gomez‐Romero, Pedro, Narayana, Chandrabhas, Zbořil, Radek, Fischer, Roland A.
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc 09.05.2019
• Subjects: Anodes; Capacitors; Carbon; Contact resistance; Electrochemical analysis; Electrode materials; Electrodes; energy density; Energy storage; Graphene; Lithium; Li‐ion capacitors; Manganese dioxide; manganese oxide; Materials science; Metal-organic frameworks; MOF‐derived materials; Nanoparticles; nanoporous carbon; Nanostructure; Structural stability
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.201900532

Hybrid metal–organic frameworks (MOFs) demonstrate great promise as ideal electrode materials for energy‐related applications. Herein, a well‐organized interleaved composite of graphene‐like nanosheets embedded with MnO2 nanoparticles (MnO2@C‐NS) using a manganese‐based MOF and employed as a promising anode material for Li‐ion hybrid capacitor (LIHC) is engineered. This unique hybrid architecture shows intriguing electrochemical properties including high reversible specific capacity 1054 mAh g−1 (close to the theoretical capacity of MnO2, 1232 mAh g−1) at 0.1 A g−1 with remarkable rate capability and cyclic stability (90% over 1000 cycles). Such a remarkable performance may be assigned to the hierarchical porous ultrathin carbon nanosheets and tightly attached MnO2 nanoparticles, which provide structural stability and low contact resistance during repetitive lithiation/delithiation processes. Moreover, a novel LIHC is assembled using a MnO2@C‐NS anode and MOF derived ultrathin nanoporous carbon nanosheets (derived from other potassium‐based MOFs) cathode materials. The LIHC full‐cell delivers an ultrahigh specific energy of 166 Wh kg−1 at 550 W kg−1 and maintained to 49.2 Wh kg−1 even at high specific power of 3.5 kW kg−1 as well as long cycling stability (91% over 5000 cycles). This work opens new opportunities for designing advanced MOF derived electrodes for next‐generation energy storage devices. Metal–organic framework derived electrodes for high performance Li‐ion hybrid capacitors: graphene‐like nanosheets wrap a MnO2 anode and nanoporous carbon nanosheet cathode.