Polymerized Ionic Networks with High Charge Density: Quasi-Solid Electrolytes in Lithium-Metal Batteries

Area of Science:

• Materials Science
• Polymer Chemistry
• Electrochemistry

Background:

• Solid-state electrolytes are crucial for next-generation batteries, but achieving high ionic conductivity and stability remains a challenge.
• Polymerized ionic networks (PINs) represent a promising class of materials for solid-state electrolytes.

Purpose of the Study:

• To synthesize novel PINs with a high density of ion pairs.
• To evaluate the ionic conductivity, electrochemical stability, and interfacial properties of these PINs.

Main Methods:

• Synthesis of PINs via nucleophilic-substitution-mediated or radical polymerization.
• Characterization of ionic conductivity using electrochemical impedance spectroscopy.
• Assessment of electrochemical stability window and interfacial compatibility with electrodes.

Main Results:

• PINs with six ion pairs per repeating unit were successfully synthesized.
• Achieved ionic conductivities up to 5.32 × 10⁻³ S cm⁻¹ at 22°C.
• Demonstrated wide electrochemical stability windows (up to 5.6 V) and good electrode interfacial compatibility.

Conclusions:

• The synthesized PINs exhibit excellent properties for solid-state electrolyte applications.
• These materials show potential for enhancing the safety and performance of electrochemical devices.
• Further research into PINs could lead to breakthroughs in battery technology.