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

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.