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Thermal synthesis of conversion-type bismuth fluoride cathodes for high-energy-density Li-ion batteries

Chemistry

Thermal synthesis of conversion-type bismuth fluoride cathodes for high-energy-density Li-ion batteries

J. F. Baumgärtner, F. Krumeich, et al.

This study by Julian F. Baumgärtner, Frank Krumeich, Michael Wörle, Kostiantyn V. Kravchyk, and Maksym V. Kovalenko introduces a scalable method to synthesize highly crystalline orthorhombic BiF3. Remarkably, this research demonstrates enhanced cyclic stability of BiF3 in ionic liquid electrolytes, achieving an impressive initial capacity of 208 mA g−1 with significant retention over 80 cycles.

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Abstract
This study presents a facile and scalable synthesis of phase-pure and highly crystalline orthorhombic BiF3 via thermal decomposition of bismuth(III) trifluoroacetate at 300 °C under inert atmosphere. Electrochemical measurements in carbonate and ionic liquid-based electrolytes demonstrated improved cyclic stability with ionic liquids. BiF3 in 4.3 M LiFSI-Pyr1,4TFSI showed a high initial capacity of 208 mA g−1 and retained ~50% capacity over 80 cycles at 30 mA g−1.
Publisher
Communications Chemistry
Published On
Jan 11, 2022
Authors
Julian F. Baumgärtner, Frank Krumeich, Michael Wörle, Kostiantyn V. Kravchyk, Maksym V. Kovalenko
Tags
BiF3
Thermal decomposition
Electrochemical measurements
Cyclic stability
Ionic liquids

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