An Ultrastable and High‐Performance Flexible Fiber‐Shaped Ni–Zn Battery based on a Ni–NiO Heterostructured Nanosheet Cathode

Abstract

Currently, the main bottleneck for the widespread application of Ni-Zn batteries is their poor cycling stability as a result of the irreversibility of the Ni-based cathode and dendrite formation of the Zn anode during the charging-discharging processes. Herein, a highly rechargeable, flexible, fiber-shaped Ni-Zn battery with impressive electrochemical performance is rationally demonstrated by employing Ni-NiO heterostructured nanosheets as the cathode. Benefiting from the improved conductivity and enhanced electroactivity of the Ni-NiO heterojunction nanosheet cathode, the as-fabricated fiber-shaped Ni-NiO//Zn battery displays high capacity and admirable rate capability. More importantly, this Ni-NiO//Zn battery shows unprecedented cyclic durability both in aqueous (96.6% capacity retention after 10 000 cycles) and polymer (almost no capacity attenuation after 10 000 cycles at 22.2 A g ) electrolytes. Moreover, a peak energy density of 6.6 µWh cm , together with a remarkable power density of 20.2 mW cm , is achieved by the flexible quasi-solid-state fiber-shaped Ni-NiO//Zn battery, outperforming most reported fiber-shaped energy-storage devices. Such a novel concept of a fiber-shaped Ni-Zn battery with impressive stability will greatly enrich the flexible energy-storage technologies for future portable/wearable electronic applications.

Stabilized Molybdenum Trioxide Nanowires as Novel Ultrahigh‐Capacity Cathode for Rechargeable Zinc Ion Battery

“…[9][10][11][12][13][14][15] In addition, the aqueous ambient of the electrodes also accelerates the ion diffusion owing to the high ionic conductivity, which enables them a better rate capability. [19][20][21] To this end, numerous research efforts have been focused on the exploiting of high-capacity cathode materials over the past few decades. [19][20][21] To this end, numerous research efforts have been focused on the exploiting of high-capacity cathode materials over the past few decades.…”

Recent Advances in Flexible Zinc‐Based Rechargeable Batteries

“…Therefore, conventional aqueous electrolyte could not meet the requirements of flexible Znbased batteries as its intrinsic character of good fluidity, which could not maintain a steady form and effectively segregate the electrodes to prevent short circuit. For example, PVA/ZnCl 2 /MnSO 4 , [9,38] PVA/KOH/ZnO [48,49] and PVA/KOH [50,51] gel electrolyte have been utilized as the electrolyte of flexible Zn-MnO 2 , Zn-Ni, and Zn-air batteries, respectively. [47] Generally speaking, the performance of gel electrolyte strongly depends on the choice of gelata and the proportion of each element.…”

Recent Progress in Flexible Fibrous Batteries

“…In order to meet the needs of portable electronic devices and enhance the property of these batteries, zinc, nickel and iron‐based nanostructures were fixed on conductive materials and then the conductivity of the material was increased. The battery was prepared as a flexible fibrous device for subsequent weaving …”

“…In the battery, a Ni‐NiO heterostructure nanosheet was used as a cathode. The battery had excellent cycling performance (attenuation only 3.4 % after 10,000 cycles), and its capacity could reach 237.8 μA h cm −3 at 3.7 A g −1 . In addition, Li et al.…”