Beyond Activated Carbon: Graphite-Cathode-Derived Li-Ion Pseudocapacitors with High Energy and High Power Densities

Wang G, Oswald S, Loeffler M, Muellen K, Feng X (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Advanced Materials Wiley

Book Volume: 31

Article Number: 1807712

Journal Issue: 14

DOI: 10.1002/adma.201807712

Abstract

Supercapacitors have aroused considerable attention due to their high power capability, which enables charge storage/output in minutes or even seconds. However, to achieve a high energy density in a supercapacitor has been a long-standing challenge. Here, graphite is reported as a high-energy alternative to the frequently used activated carbon (AC) cathode for supercapacitor application due to its unique Faradaic pseudocapacitive anion intercalation behavior. The graphite cathode manifests both higher gravimetric and volumetric energy density (498 Wh kg −1 and 431.2 Wh l −1 ) than an AC cathode (234 Wh kg −1 and 83.5 Wh l −1 ) with peak power densities of 43.6 kW kg −1 and 37.75 kW l −1 . A new type of Li-ion pseudocapacitor (LIpC) is thus proposed and demonstrated with graphite as cathode and prelithiated graphite or Li 4 Ti 5 O 12 (LTO) as anode. The resultant graphite–graphite LIpCs deliver high energy densities of 167–233 Wh kg −1 at power densities of 0.22–21.0 kW kg −1 (based on active mass in both electrodes), much higher than 20–146 Wh kg −1 of AC-derived Li-ion capacitors and 23–67 Wh kg −1 of state-of-the-art metal oxide pseudocapacitors. Excellent rate capability and cycling stability are further demonstrated for LTO-graphite LIpCs.

Involved external institutions

Technische Universität Dresden DE Germany (DE) Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden DE Germany (DE) Max-Planck-Institut für Polymerforschung (MPI-P) / Max Planck Institute for Polymer Research DE Germany (DE)

How to cite

APA:

Wang, G., Oswald, S., Loeffler, M., Muellen, K., & Feng, X. (2019). Beyond Activated Carbon: Graphite-Cathode-Derived Li-Ion Pseudocapacitors with High Energy and High Power Densities. Advanced Materials, 31(14). https://doi.org/10.1002/adma.201807712

MLA:

Wang, Gang, et al. "Beyond Activated Carbon: Graphite-Cathode-Derived Li-Ion Pseudocapacitors with High Energy and High Power Densities." Advanced Materials 31.14 (2019).

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