Structurally reconstituted calcium manganate nanoparticles as a high-performance cathode for aqueous Zn-ion batteries

Abstract

This work demonstrates a kind of Ca-deficient Ca0.96Mn3.04O4 nanoparticle framework derived from α-MnO2-like CaMn2O4via structural reconstruction strategy as promising cathode materials for aqueous Zn-ion batteries.

Revisiting Charge Storage Mechanism of Reduced Graphene Oxide in Zinc Ion Hybrid Capacitor beyond the Contribution of Oxygen‐Containing Groups

“…[7][8][9] Particularly, aqueousbased hybrid devices composed of two types of electrodes involving the charge storage mechanisms of electrochemical redox reactions and electrostatic adsorption/desorption possess the merits of battery-like energy density and capacitorlike fast charge/discharge capability. [10][11][12][13] Regarding anode material, metallic Zn is deemed as an ideal candidate due to its superior theoretical capacity of 823 mAh g −1 , appropriate redox potential (−0.76 vs. standard hydrogen electrode), [14][15][16] as well as natural abundance. However, the development of proper cathode materials that match with Zn anode well remains challenging.…”

Facile Zn2+ Desolvation Enabled by Local Coordination Engineering for Long‐Cycling Aqueous Zinc‐Ion Batteries

“…The coefficient b = 0.5 indicates a diffusion‐controlled reaction, while a value of 1 represents a surface capacitive behavior. [ 55 ] From the fitted plots shown in Figure S6 (Supporting Information), the b values of four redox peaks for MnOF0.04 corroborate that the charge storage process is governed by both ionic diffusion and capacitive behavior. Notably, the larger b values of MnOF0.04 than that of MnO 2 reveal a larger contribution of a surface‐controlled capacitive process for MnOF0.04.…”

Fabrication of dual-functional electrodes using oxygen vacancy abundant NiCo2O4nanosheets for advanced hybrid supercapacitors and Zn-ion batteries

“…Furthermore, the extremely outstanding energy density (717.4 W h kg −1 ) and power density (1710 W kg −1 ) of the V-NiCo 2 O 4 -4//Zn battery are presented in Fig. 6g, which was greater than most of the other reported Zn-ion batteries, such as V 3 O 7 •H 2 O//Zn, 54 P-NiCo 2 O 4−x //Zn, 55 PbO 2 //Zn, 56 ZnCo 2 O 4−x // Zn, 57 N 3 VPDF@C//CFF-Zn, 58 PANI//Zn, 59 E-MoS 2 //Zn, 60 CP-CMO//Zn, 61 and Sd-NiCo 2 S 4 -x@CC-1.2 g Na 2 S//Zn. 62 Therefore, this work makes the binder-free V-NiCo 2 O 4 -4 electrode a potential candidate for electrochemical energy storage.…”