Construction of mesoporous bimetallic (Ni, Co) organic framework microspheres for lithium-ion capacitors
Jinyang Zhang, Yuyan Wang, Yamin Zhang, Fakhr uz Zaman, Linrui Hou, Changzhou Yuan
Abstract
Rational design of appropriate negative electrode materials with high rates and long cycle life is essential to construct advanced lithium-ion capacitors (LICs). Herein, we solvothermally synthesize the bimetallic (Ni, Co) organic framework (NiCo-MOF) microspheres by using the polyvinylpyrrolidone as a structure-directing agent towards advanced LICs as a battery-type negative electrode. Benefiting from its rigid structure stability, high crystallinity, rich electroactive sites and high-content mesopores, the NiCo-MOF electrode obtains a large reversible capacity of ~557.1 mAh g−1 at 0.1 A g−1. Furthermore, the NiCo-MOF based LICs display a high SC of ~58.2 F g−1 at ~1.0 A g−1, along with an exceptional capacitance retention over 8500 cycles at 1.0 A g−1. More significantly, the contribution here will stimulate extensive development of versatile MOF microspheres for next-generation LICs and beyond.