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Enabling All-Solid-State Lithium-Carbon Dioxide Battery Operation in a Wide Temperature Range.

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Flexible all-solid-state lithium-carbon dioxide batteries (FASSLCBs) show promise for safer energy storage. Novel bicontinuous hierarchical porous structures improve mass transfer and enable room temperature operation, enhancing cycling stability.

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bicontinuous hierarchical porous structuresflexible energy storage technologylithium−carbon dioxide batterysolid polymer electrolytewide temperature range battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Flexible all-solid-state lithium-carbon dioxide batteries (FASSLCBs) offer enhanced safety and eliminate shuttle effects compared to traditional batteries.
  • Current FASSLCBs require high temperatures due to slow mass transfer and an unclear degradation mechanism, limiting their practical application.
  • Sluggish solid-solid-gas multiphase mass transfer and capacity fade are key challenges hindering FASSLCB performance.

Purpose of the Study:

  • To design bicontinuous hierarchical porous structures (BCHPSs) for both the solid polymer electrolyte and cathode in FASSLCBs.
  • To enhance mass transfer in all directions within FASSLCBs.
  • To elucidate the capacity degradation mechanism and improve the cycling stability of FASSLCBs.

Main Methods:

  • Fabrication of bicontinuous hierarchical porous structures (BCHPSs) for solid polymer electrolyte and cathode.
  • Characterization of the porous structures and their effect on lithium salt dissociation and CO2 conversion.
  • Investigation of the battery capacity degradation mechanism, focusing on Li2CO3 formation and decomposition.

Main Results:

  • The BCHPSs facilitate mass transfer in all connected directions and provide a large Lewis acidic surface area.
  • The large Lewis acidic surface promotes lithium salt dissociation and CO2 conversion, crucial for battery operation.
  • Capacity degradation was identified as 'dead Li2CO3' formation, which is mitigated by fast Li2CO3 decomposition enabled by BCHPSs.
  • Assembled FASSLCBs with BCHPSs demonstrated 2.7 times longer cycling stability (133 cycles at 60 °C) compared to those without.
  • The FASSLCBs with BCHPSs can operate repeatedly at room temperature, indicating significant performance improvement.

Conclusions:

  • The developed BCHPS method effectively addresses mass transfer limitations and promotes CO2 conversion in FASSLCBs.
  • Understanding and inhibiting 'dead Li2CO3' formation is key to improving battery longevity.
  • This approach provides a viable strategy for designing high-performance, long-cycling FASSLCBs operable at room temperature.