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Resilience-Enhancing Additive Design Enabled by Macrocyclic Additive-Mediated Failure Suppression in Lithium-Ion

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A new macrocyclic additive enhances high-voltage lithium-ion battery (LIB) performance by preventing metal ion dissolution and deactivating harmful oxygen radicals. This dual-action approach improves battery stability and longevity.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-voltage operation in mid-nickel NCM lithium-ion batteries (LIBs) boosts energy density but causes degradation.
  • Key degradation pathways include transition-metal dissolution and oxygen-radical formation, leading to performance loss.

Purpose of the Study:

  • To introduce a novel macrocyclic additive, 1,4,7,10,13-pentaazacyclopentadecane, for enhancing LIB resilience.
  • To elucidate the dual-protection mechanism of the additive in high-voltage LIBs.

Main Methods:

  • Incorporation of the macrocyclic additive into LIB electrolytes.
  • Investigation of the additive's interaction with dissolved manganese ions.
  • Assessment of the additive's effect on oxygen radicals and overall cell performance under high-voltage conditions.

Main Results:

  • The additive effectively chelates dissolved Mn ions, preventing negative electrode contamination.
  • The Mn-bound additive neutralizes oxygen radicals, suppressing gas evolution and electrolyte decomposition.
  • Cells with the additive show improved cycling stability, reduced capacity fading, and stabilized interfaces.

Conclusions:

  • The macrocyclic additive provides a dual-protection mechanism against high-voltage degradation in LIBs.
  • This strategy overcomes limitations of traditional film-forming additives, offering enhanced long-term durability.
  • The study presents a promising approach for developing high-energy, long-lasting LIBs.