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Paving the way toward highly efficient, high-energy potassium-ion batteries with ionic-liquid electrolytes

DOI: 10.1021/acs.chemmater.0c01347 DOI Help

Authors: Michele Fiore (University of Oxford; Università di Milano-Bicocca) , Samuel Wheeler (University of Oxford) , Kevin Hurlbutt (University of Oxford) , Isaac Capone (University of Oxford) , Jack Fawdon (University of Oxford) , Riccardo Ruffo (University of Oxford; Università di Milano-Bicocca) , Mauro Pasta (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemistry Of Materials

State: Published (Approved)
Published: August 2020
Diamond Proposal Number(s): 14809

Abstract: Potassium-ion batteries (KIB) are a promising complementary technology to lithium-ion batteries because of the comparative abundance and affordability of potassium. Currently, the most promising KIB chemistry consists of a potassium manganese hexacyanoferrate (KMF) cathode, a Prussian blue analog, and a graphite anode (723Whl−1 and 359Whkg−1 at 3.6V). No electrolyte has yet been formulated that is concurrently stable at the high operating potential of KMF (4.02V vs K+/K) and compatible with K+ intercalation into graphite, currently the most critical hurdle to adoption. Here we combine a KMF cathode and a graphite anode with a KFSI in Pyr1,3FSI ionic liquid electrolyte for the first time and show unprecedented performance. We use high-throughput techniques to optimize the KMF morphology for operation in this electrolyte system, achieving 119 mA h g−1 at 4 V vs K+/K and a coulombic efficiency >99.3%. In the same ionic liquid electrolyte graphite shows excellent electrochemical performance and we demonstrate reversible cycling by operando XRD. These results are a significant and essential step forward towards viable potassium-ion batteries.

Journal Keywords: Potassium; Anode materials; Carbon; Materials; Electrodes

Diamond Keywords: Batteries; Potassium-ion

Subject Areas: Chemistry, Materials, Energy


Instruments: I11-High Resolution Powder Diffraction

Discipline Tags:

Chemistry Energy Energy Materials Energy Storage Material Sciences Physical Chemistry

Technical Tags:

Diffraction