A Cyclized Polyacrylonitrile Anode for Alkali Metal Ion Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Organic anodes are gaining traction for advanced alkali metal ion batteries.
• Developing high-performance, sustainable anode materials is crucial for next-generation energy storage.

Purpose of the Study:

• To investigate cyclized polyacrylonitrile (cPNA) as a novel organic anode material.
• To elucidate the lithium-ion storage mechanisms in cPAN.
• To evaluate cPAN performance in lithium-ion, sodium-ion, and potassium-ion batteries.

Main Methods:

• Electrochemical testing (galvanostatic cycling, rate capability).
• First-principles calculations to identify active sites.
• Analysis of solid electrolyte interphase (SEI) formation.

Main Results:

• cPNA achieved a high reversible capacity of 1238 mAh g^-1 at 50 mA g^-1 in lithium-ion batteries.
• Hexagonal carbon rings, piperidine rings, and pyridine nitrogen were identified as key lithium-ion storage sites.
• Unique potential-dependent SEI formation was observed between 0.1 and 0.01 V vs. Li/Li⁺.
• cPNA demonstrated viable performance as an anode in sodium-ion and potassium-ion batteries.

Conclusions:

• Cyclized polyacrylonitrile is a high-performance organic anode for alkali metal ion batteries.
• Understanding the active sites and SEI formation is key to optimizing cPAN performance.
• cPNA presents a promising alternative for sustainable energy storage applications.