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Construction of solid-liquid fluorine transport channel to enable highly reversible conversion cathodes
Keyi Chen1,2,3, Meng Lei1,3, Zhenguo Yao1,2
1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 585 He Shuo Road, Shanghai 201899, China.
Science Advances
|November 3, 2021
Summary
This study introduces a solid-liquid conversion mechanism for iron oxyfluoride cathodes, enhancing fluorine transport and enabling high energy density batteries. This approach overcomes sluggish solid-state reactions for improved performance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Conversion-type iron fluoride cathodes offer higher energy density than traditional intercalation oxides.
- Sluggish solid-solid conversion hinders the performance of iron fluoride cathodes due to slow metal-fluorine bond dynamics.
Purpose of the Study:
- To develop a novel solid-liquid conversion mechanism to enhance fluorine transport kinetics in iron oxyfluoride cathodes.
- To activate iron oxyfluorides for high-performance energy storage applications.
Main Methods:
- Utilized tris(pentafluorophenyl)borane (TPFPB) as a fluoride anion receptor to promote fluorine transport.
- Investigated the formation of solvated F- intermediates and solid-liquid channels at multiphase interfaces.
- Tested FeO0.3F1.7 and FeO0.7F1.3 cathodes for electrochemical performance.
Main Results:
- TPFPB facilitated the dissociation of lithium fluoride and created efficient fluorine transport pathways.
- Achieved sustained conversion reactions with energy efficiency approaching 80% for FeO0.3F1.7 and FeO0.7F1.3.
- Demonstrated high-rate performance with a reversible capacity of 320 mAh/g at 2 A/g.
- Attained cathode energy densities of 1100 Wh/kg (FeO0.3F1.7) and 700 Wh/kg (FeO0.7F1.3).
Conclusions:
- The proposed solid-liquid conversion mechanism effectively overcomes the limitations of solid-state reactions in iron oxyfluorides.
- This strategy enables high energy density and high-rate capabilities, making iron oxyfluorides promising for advanced batteries.
