Pyrochlore‐Type Iron Hydroxy Fluorides as Low‐Cost Lithium‐Ion Cathode Materials for Stationary Energy Storage

Author:

Baumgärtner Julian Felix12ORCID,Wörle Michael1ORCID,Guntlin Christoph P.1ORCID,Krumeich Frank1ORCID,Siegrist Sebastian1,Vogt Valentina1,Stoian Dragos C.3ORCID,Chernyshov Dmitry3ORCID,van Beek Wouter3ORCID,Kravchyk Kostiantyn V.12ORCID,Kovalenko Maksym V.12ORCID

Affiliation:

1. Laboratory of Inorganic Chemistry Department of Chemistry and Applied Biosciences ETH Zürich Zürich CH‐8093 Switzerland

2. Laboratory for Thin Films and Photovoltaics Empa – Swiss Federal Laboratories for Materials Science & Technology Dübendorf CH‐8600 Switzerland

3. Swiss–Norwegian BeamLines at the European Synchrotron Radiation Facility Grenoble 38000 France

Abstract

AbstractPyrochlore‐type iron (III) hydroxy fluorides (Pyr‐IHF) are appealing low‐cost stationary energy storage materials due to the virtually unlimited supply of their constituent elements, their high energy densities, and fast Li‐ion diffusion. However, the prohibitively high costs of synthesis and cathode architecture currently prevent their commercial use in low‐cost Li‐ion batteries. Herein, a facile and cost‐effective dissolution–precipitation synthesis of Pyr‐IHF from soluble iron (III) fluoride precursors is presented. High capacity retention by synthesized Pyr‐IHF of >80% after 600 cycles at a high current density of 1 A g−1 is obtained, without elaborate electrode engineering. Operando synchrotron X‐ray diffraction guides the selective synthesis of Pyr‐IHF such that different water contents can be tested for their effect on the rate capability. Li‐ion diffusion is found to occur in the 3D hexagonal channels of Pyr‐IHF, formed by corner‐sharing FeF6–x(OH)x octahedra.

Funder

Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

Norges Forskningsråd

Fonds der Chemischen Industrie

Publisher

Wiley

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

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