Ultra-stable and high capacity flexible lithium-ion batteries based on bimetallic MOFs derivatives aiming for wearable electronic devices

The special demand of wearable electronic devices has resulted in a growing interest in developing key electrode materials for high-performance flexible lithium-ion batteries. In this article, a flexible bimetallic zeolite imidazolium salt polyacrylonitrile framework was prepared by a simple electrospinning method, and directly used as self-supported anode material for high-performance lithium-ion batteries after subsequent heat treatment. Benefiting from their unique morphology and bimetallic synergism, as-prepared [email protected]/carbon nanofibers (CNFs) combination of MOFs derivatives and carbon nanofibers, exhibit excellent electrochemical performance for flexible lithium-ion batteries. The sample [email protected]/CNFs-2 delivers a specific capacity of 1104.9 mAh·g−1 after 150 cycles at a current density of 100 mA·g−1, and even 935.6 and 718.1 mAh·g−1 at high current density of 0.5 and 1 A·g−1, respectively. Remarkably, no noticeable capacity fading is observed even after 260 charge/discharge cycles.