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Highly Reversible Conversion-Type CoSn2 Cathode for Fluoride-Ion Batteries.

Shun Sasano1, Ryo Ishikawa1, Kazuaki Kawahara1

  • 1Institute of Engineering Innovation, The University of Tokyo, Bunkyo, Tokyo, 113-8656, Japan.

Small (Weinheim an Der Bergstrasse, Germany)
|October 22, 2024
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Summary
This summary is machine-generated.

A new cobalt-tin alloy (CoSn2) cathode enables all-solid-state fluoride-ion batteries (FIBs) to operate efficiently at lower temperatures. This advanced cathode material demonstrates excellent capacity retention and stability, addressing key challenges in next-generation battery technology.

Keywords:
Sn‐based intermetallic alloyconversion‐type cathodecycle stabilityfluoride‐ion batteryoperating temperature

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All-solid-state fluoride-ion batteries (FIBs) offer high energy density and safety.
  • Current challenges for FIBs include low fluoride ion conductivity and poor cycle stability in pure metal cathodes, hindering low-temperature operation.

Purpose of the Study:

  • To develop a novel conversion-type cathode material for all-solid-state FIBs.
  • To overcome the limitations of pure metal cathodes for improved low-temperature performance and cycle stability.

Main Methods:

  • Synthesis and characterization of a cobalt-tin intermetallic alloy (CoSn2) as a conversion-type cathode.
  • Electrochemical testing of the CoSn2 cathode in all-solid-state FIBs at various temperatures.
  • Analysis of the charge-discharge mechanisms and structural evolution of the cathode material.

Main Results:

  • The CoSn2 cathode achieved a discharge capacity of 229 mAh g-1 after 250 cycles at 60°C.
  • During charging, CoSn2 decomposes into CoF2 and SnF2 nanocrystals, forming a nanoscale SnF2 network that enhances fluoride ion conduction.
  • The cathode exhibits a highly reversible redox reaction, merging back into the CoSn2 phase during discharge, ensuring high cycle stability.

Conclusions:

  • The CoSn2 intermetallic alloy is a promising cathode material for all-solid-state FIBs, enabling efficient operation at lower temperatures.
  • The nanoscale structure and reversible conversion mechanism of CoSn2 significantly improve ionic conductivity and cycle life.
  • This research paves the way for enhanced performance of all-solid-state FIBs in demanding temperature conditions.