Solution‐Processable Design of Fiber‐Shaped Wearable Zn//Ni(OH)₂ Battery

Abstract

The rising of flexible and potable electronics urgently calls for matchable and miniaturized energy storage system as power supply. Herein, we develop a solution‐processable method to fabricate Ni@Ni(OH)2 fiber to design an all‐solid‐state fiber‐shaped Zn//Ni(OH)2 battery. This battery exhibits a high open circuit voltage of 1.75 V which is close to the theoretical value, considerable discharge capacity of 704 μAh cm−3 at current density of 0.5 A g−1, good rate capability with 75 % capacity retention when the discharge current increases from 0.5 A g−1 to 5 A g−1 and good cycling stability (92 % capacity retention after 2000 charge‐discharge cycles). Furthermore, the device performance remains unchanged under bending conditions, showing good flexibility and stability. It is believed that our design provides a promising strategy to fabricate long fiber‐shaped Zn//Ni(OH)2 battery as power supply for wearable electronics in future practical applications.

Engineering Sulfur Vacancies of Ni3S2 Nanosheets as a Binder-Free Cathode for an Aqueous Rechargeable Ni-Zn Battery

“…The detailed reason can be due to the fact that the possible generation of zinc hydroxide oxide on the Zn anode raises the internal resistance of the system. 10 In addition, the obtained C sp of the r-Ni 3 S 2 //Zn battery considerably exceeds, most recently, the reported Ni-Zn batteries at similar situations, for example, Ni 2 P nanosheet arrays//Zn (231 mAh g −1 ), 10 Ni 3 S 2 nanosheets//Zn (148 mAh g −1 ), 14 NiS 2 /reduced graphene oxide//Zn (209.3 mAh g −1 ), 15 NiO//Zn (155 mAh g −1 ), 54 Ni@Ni(OH) 2 //Zn (118 mAh g −1 ), 55 Co-doped Ni(OH) 2 //Zn (248 mAh g −1 ), 56 and NiCo 2 O 4 //Zn (222.75 mAh g −1 ). 57 Figure 7c describes the rate abilities of r-Ni 3 S 2 //Zn batteries, which deliver a stable rate profile with specific capacities ranging from 240.8 mAh g −1 at 1 A g −1 to 167.5 mAh g −1 at 8 A g −1 .…”

A Novel Method to Prepare Flexible 3D NiO Nanosheets Electrodes for Alkaline Rechargeable Ni−Zn Batteries

“…This volumetric capacity surpasses those values reported for other alkaline rechargeable batteries, such as activate Ni foil j j Zn (1.62 mA h cm À 3 at 76.9 mA cm À 3 ), [4a] AÀ Ni/NC j j Zn (0.38 mA h cm À 3 at 6 mA cm À 2 ), [22] NiÀ NiO j j Zn (0.12 mA h cm À 3 at 3.7 A g À 1 ), [10] Co(CO 3 ) 0.5 (OH) x • 0.11H 2 O@CoMoO 4 j j C-ZnO (3.0 mA h cm À 3 at 25 mA cm À 3 ), [23] GE@CNTÀ Fe-Fe 3 C/CF j j GE@Ni-CoO/CF (1.61 mA h cm À 3 at 3.0 mA), [24] Ni@Ni(OH) 2 j j Zn (0.7 mA h cm À 3 at 0.5 A g À 1 ). [25] The corresponding coulombic efficiencies are also recorded in Figure 4c. The coulombic efficiency remains 100 % when current density exceeds 5.0 mA cm À 2 , showing an excellent electrochemically reversible process.…”

“…Next, the capacity recovers to 3.3 mAh cm −3 after abruptly return to 0.7 mA cm −2 at the 56th cycle. This volumetric capacity surpasses those values reported for other alkaline rechargeable batteries, such as activate Ni foil||Zn (1.62 mA h cm −3 at 76.9 mA cm −3 ), [4a] A−Ni/NC||Zn (0.38 mA h cm −3 at 6 mA cm −2 ), [22] Ni−NiO||Zn (0.12 mA h cm −3 at 3.7 A g −1 ), [10] Co(CO 3 ) 0.5 (OH) x ⋅ 0.11H 2 O@CoMoO 4 ||C‐ZnO (3.0 mA h cm −3 at 25 mA cm −3 ), [23] GE@CNT−Fe‐Fe 3 C/CF||GE@NiCoO/CF (1.61 mA h cm −3 at 3.0 mA), [24] Ni@Ni(OH) 2 ||Zn (0.7 mA h cm −3 at 0.5 A g −1 ) [25] . The corresponding coulombic efficiencies are also recorded in Figure 4c.…”

Recent Advances in Design of Flexible Electrodes for Miniaturized Supercapacitors

“…Great efforts have been addressed to develop suitable fibrous electrodes, e.g., carbon fibers (CFs), carbon nanotube (CNT) fibers, graphene fibers (GFs), polymer fibers, and composite fibers . The advances in nanoscience provides highly compatible technologies that can efficiently assemble with newly developed additive nanomaterials into fibers for enhanced functionalities . In this section, the recent strategies in fabricating 1D fibrous electrodes will be introduced based on wet‐spinning, dry‐spinning, electrospinning, and hydrothermal methods.…”