A Monocrystalline Coordination Polymer with Multiple Redox Centers as a High‐Performance Cathode for Lithium‐Ion Batteries

Abstract

Coordination polymers can take advantage of both transition metal redox and organic ligand redox, thus serving as promising cathodes with multiple redox centers toward higher-performance lithium-ion batteries (LIBs). Here, we selected the high-capacity carbonyl compound of chloranilic acid (CA) as organic ligand to coordinate with the high-voltage Cu 2 + as transition metal node and successfully synthesized copper(II) chloranilate (CuCA) with π-d conjugation, layered structure and monocrystalline nature. The resulting CuCA presents inorganic and organic redox centers, high electronic conductivity and fast Li + diffusion kinetics, leading to high discharge capacity (297.0 mAh g À 1 at 50 mA g À 1 ), excellent rate capability (160.6 mAh g À 1 at 1000 mA g À 1 ) and good cycling stability (165.5 mAh g À 1 at 500 mA g À 1 after 50 cycles) with quasi-solid-state electrolyte. This work will provide insightful understanding of the materials design strategies to develop more efficient coordination polymer cathodes for LIBs.