High Fracture Toughness of 1D Copper‐Based MOP Electrode Enables Fast‐Charging Lithium‐Ion Batteries

ABSTRACT Fast charging technology in lithium‐ion batteries (LIBs) is critically dependent on the mechanical robustness of electrode materials, which must withstand significant stress and strains during rapid cycling. However, a comprehensive study of the relationship between mechanical property and battery performance remains rare, particularly under fast‐charging conditions. In this work, we bridge this knowledge gap by developing a one‐dimensional conductive metal–organic polymer (MOP, i.e., Cu‐DDA) that exhibits high fracture toughness for fast charging. Moreover, the robust π‐d conjugation structure of Cu‐DDA minimizes lattice deformation and volume expansion, thereby preserving structural stability under high current densities. As a result, the Cu‐DDA cathode achieves an attractive reversible capacity of 190 mAh g −1 at a high current density of 15 A g −1 and remarkable capacity retention of 78% after 400 cycles at 5 A g −1 . This study demonstrates the significant impact of inherent mechanical properties, providing important design insights for next‐generation fast‐charging electrode materials.