Electropolymerization Stabilized Bipolar Metal Coordination Complex for High-Performance Dual-Ion Batteries

Metal coordination complexes with remarkable redox activity and high working voltage are plagued by their limited specific capacity and sever dissolution problem. A bipolar cobalt-based coordination polymer (CoL) bearing both p-type and n-type active centers was synthesized via the in-situ electropolymerization method with collective merits of multiple redox sites, dual-ion storage capability, and excellent chemical stability. As-prepared electrodes delivered remarkable performances including a high discharge specific capacity of 192.13 mAh g-1 (at 0.05 A g-1), stable cycling over 2000 cycles with 89% capacity retention (at 5A g-1), and excellent rate capability. Moreover, the dual-ion storage processes were unveiled by ex situ Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analysis. It provides insight to design and synthesis of electropolymerized bipolar electrode for high performance dual-ion batteries.