Enabling Conversion-Type Iron Fluoride Cathode by Halide-Based Solid Electrolyte

doi:10.1002/adfm.202206845

Enabling Conversion-Type Iron Fluoride Cathode by Halide-Based Solid Electrolyte

2022-09-30

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DOI：10.1002/adfm.202206845

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The practical application of low-cost and energy-dense iron fluoride cathodes is hindered by the first cycle electrochemical irreversibility, cycling instability, and large voltage hysteresis. Here, it is reported that these challenges may be overcome by the utilization of halide-based solid electrolytes (SEs). The excellent electrochemical stability of halide-based SEs enables a complete conversion and deconversion of FeF2 that cannot be achieved with sulfide-based SEs. Due to restricted and reversible decomposition of SE, prevention of Fe dissolution, mechanical confinement of active material, as well as improved electrode kinetics, solid-state FeF2 cathode with halide-based SE demonstrates superior electrochemical performance compared with FeF2 electrodes in liquid electrolytes, with a high 1st cycle coulombic efficiency (approximate to 100%), high specific capacity (approximate to 600 mAh g(-1)), long cycle life (>100 cycles), and high-rate performance (up to 2 C). The results suggest solidifying the batteries is a viable approach to addressing the long-standing key challenges of iron fluoride cathodes.

Keywords:

all-solid-state batteries

conversion-type iron fluoride cathodes

halide solid electrolytes

lithium-ion batteries

Enabling Conversion-Type Iron Fluoride Cathode by Halide-Based Solid Electrolyte

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