Electrochromic energy-storage devices have garnered significant attention owing to their ability to visualize the state of charge in real time through color changes. However, conventional electrochromic materials generally suffer from limitations such as slow response speed, low coloration efficiency, and insufficient stability. One-dimensional (1D) coordination polymers have emerged as highly promising candidates in the fields of electrochromic energy storage owing to their designable structures, abundant redox-active sites and good solution processability. However, most reported 1D systems adopt symmetric planar configurations (e.g., M–N₄ or M–O₄), whose uniform electron distribution restricts charge-transfer dynamics and optical modulation efficiency. To this end, herein propose an asymmetric coordination strategy in which 4,6-diaminoresorcinol dihydrochloride (DAR) serves as a mixed N,O-donor ligand and Ni serves as the metal source, enabling the in situ growth of one-dimensional (1D) asymmetric coordination polymer (Ni-DAR) films on ITO glass via a chemical bath method. This asymmetric structure creates a permanent dipole moment along the polymer chain, promoting charge separation and polaron delocalization. The distorted geometry induced by mixed N,O coordination lowers the kinetic barriers during redox processes. In addition, the twisted chain morphology increases the interchain free volume and enhances ion diffusion. Owing to the above advantages, the Ni-DAR film exhibits excellent electrochromic performance, including coloration/ bleaching times of 1.5s/0.7 s, respectively, a coloration efficiency exceeding 300 cm² C^-1, and favorable energy-storage capability in acidic electrolytes. This work reveals the critical role of coordination asymmetry in regulating charge-transfer kinetics and optical modulation efficiency, providing a new strategy for the design of high-performance electrochromic energy-storage materials.