High-Performance Cable-Type Flexible Rechargeable Zn Battery Based on MnO@CNT Fiber Microelectrode.

Nowadays, linear-shaped batteries have received increasing attentions because the unique one-dimensional architecture offers an omni-directional flexibility. We developed a cable-type flexible rechargeable Zn microbattery based on a microscale MnO@carbon nanotube fiberlike composite cathode and Zn wire anode. The Zn-MnO cable microbattery exhibits a large specific capacity, good rate performance, and cyclic stability. The capacity of Zn-MnO cable batteries are 322 and 290 mAh/g based on MnO with aqueous and gel polymer electrolyte, corresponding to the specific energy of 437 and 360 Wh/kg, respectively. Besides, the Zn-MnO cable battery shows excellent flexibility, which can be folded into arbitrary shapes without sacrificing electrochemical performance. Furthermore, we studied electrochemical properties of Zn-MnO cable microbatteries with different Zn salt electrolytes, such as Zn salt with small anions (ZnSO or ZnCl, etc.) and Zn salt with bulky anions (Zn(CFSO), etc.). With the merits of impressive electrochemical performance and flexibility, this first flexible rechargeable Zn-MnO cable-like battery presents a new approach to develop high-performance power sources for portable and wearable electronics.