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

• Bimetallic MOFs derivatives were obtained by a simple electrospinning method for anode materials. • The Co@ZnO/CNFs can be directly used as self-supporting anode materials. • Unique morphology and bimetallic synergism exhibit high specific reversible capacity and enhanced cycle stability. 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 Co@ZnO/carbon nanofibers (CNFs) combination of MOFs derivatives and carbon nanofibers, exhibit excellent electrochemical performance for flexible lithium-ion batteries. The sample Co@ZnO/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. [ABSTRACT FROM AUTHOR]