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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Organic electrode materials are crucial for post-lithium battery technologies.
  • Phenothiazine is a promising redox-active group due to its high potentials and functionalizability.
  • π-interactions in phenothiazine polymers can affect stability and cycling performance.

Purpose of the Study:

  • To investigate the impact of π-interactions on phenothiazine-based polymer battery performance.
  • To develop design principles for highly functional phenothiazine polymers.
  • To enable the investigation of full cells utilizing these materials.

Main Methods:

  • Synthesized and characterized various phenothiazine-based polymers.
  • Investigated electrode performance in different electrolyte compositions.
  • Employed strategies like electrolyte tuning, carbon encapsulation, and polymer cross-linking (X-PVMPT) to mitigate dissolution and π-interactions.
  • Modified polymer backbone and heteroatom for performance tuning.
  • Designed conjugated phenothiazine polymers for enhanced conductivity and optical properties.

Main Results:

  • Dissolution of poly-(3-vinyl-N-methylphenothiazine) (PVMPT) in electrolytes reduced its specific capacity.
  • Strategies to inhibit π-interactions successfully accessed the full theoretical capacity.
  • Phenothiazine polymers demonstrated applicability in various full-cell configurations, including dual-ion, anion-rocking-chair, and aluminum batteries.
  • Conjugated phenothiazine polymers showed improved conductivity and potential for photobattery applications.

Conclusions:

  • Phenothiazine polymers are versatile and high-performing electrode materials for next-generation batteries.
  • Controlling π-interactions and polymer structure is key to optimizing battery performance.
  • These materials show significant promise for diverse battery chemistries beyond lithium-ion.