Quinone‐Amine Polymer Nanoparticles Prepared through Facile Precipitation Polymerization as Ultrafast and Ultralong Cycle Life Cathode Materials for Lithium‐Ion Batteries

Abstract Polymer electrode materials are often poorly soluble in liquid organic electrolytes of lithium‐ion batteries, yet they suffer from issues of severe agglomeration and complicated synthesis processes, which hinder their practical applications. Herein, spherical cross‐linked quinone‐amine polymer nanoparticles (denoted as PQANPs) are synthesized through a facile precipitation polymerization, which can effectively address the agglomeration problems of polymer electrode materials. The cross‐linking degrees of polymers and diameters of PQANPs can be facilely tuned by adjusting the feed ratios of p ‐benzoquinone to 3,3′‐diaminobenzidine. The optimized PQANP demonstrates excellent electrochemical performance with an ultrafast rate capability of 25 A g −1 and an ultralong cycle life of 20 000 cycles, which exceed all benzoquinone‐based polymer electrode materials reported in the literature. The findings offer an efficient and convenient strategy for high‐performance nanostructured polymer electrode materials.