Mesoporous ZnMn₂O₄ Microtubules Derived from a Biomorphic Strategy for High-Performance Lithium/Sodium Ion Batteries

Abstract

ZnMn2O4 microtubules (ZMO-MTs) with a mesoporous structure are fabricated by a novel yet effective biomorphic approach employing cotton fiber as a biotemplate. The fabricated ZMO-MT has approximately an inner diameter of 8.5 μm and wall thickness of 1.5 μm. Further, the sample of ZMO-MT displays a large specific surface area of 48.5 m2 g–1. When evaluated as a negative material for Li-ion batteries, ZMO-MT demonstrates an improved cyclic performance with discharge capacities of 750.4 and 535.2 mA h g–1 after 300 cycles, under current densities of 200 and 500 mA g–1, respectively. Meanwhile, ZMO-MT exhibits superior rate performances with high reversible discharge capacities of 614.7 and 465.2 mA h g–1 under high rates of 1000 and 2000 mA g–1, respectively. In sodium ion batteries applications, ZMO-MT delivers excellent high discharge capacities of 102 and 71.4 mA h g–1 after 300 cycles under 100 and 200 mA g–1, respectively. An excellent rate capability of 58.2 mA h g–1 under the current density of 2000 mA g–1 can also be achieved. The promising cycling performance and rate capability could be benefited from the unique one-dimensional mesoporous microtubular architecture of ZMO-MT, which offers a large electrolyte/electrode accessible contact area and short diffusion distance for both of ions and electrons, buffering the volume variation originated from the repeated ion intercalation/deintercalation processes.

3D Ordered Porous Hybrid of ZnSe/N‐doped Carbon with Anomalously High Na+ Mobility and Ultrathin Solid Electrolyte Interphase for Sodium‐Ion Batteries

“…In Figure 4c, the high resolution Zn 2p XPS spectrum exhibits two characteristic peaks at 1020.9 and 1044.0 eV, corresponding to the spin orbits of Zn 2p 3/2 and Zn 2p 1/2 of ZnSe, respectively. [ 36,37 ] In Figure 4d, two obvious peaks of Se 3d are located at 54.1 and 54.8 eV, correlated with the spin orbits of Se 3d 5/2 and Se 3d 3/2 of ZnSe, respectively. [ 38,39 ] There is a small peak at around 56.1 eV, caused by excessive selenium powder during the selenization process.…”

Mechanism Study of Carbon Coating Effects on Conversion-Type Anode Materials in Lithium-Ion Batteries: Case Study of ZnMn2O4 and ZnO–MnO Composites

“…This can be ascribed to the carbon layer, which covers the active sites of the active materials. 39,40 In subsequent cycles, two anodic peaks at ~1.2 V (Mn 0 to Mn 2+ ) and ~1.5 V (Zn 0 to Zn 2+ ) and one cathodic peak at ~0.5 V (Mn 2+ to Mn 0 and Zn 2+ to Zn 0 ) can be observed, indicating the occurrence of conversion reactions. 19 In Figure 6b&c, the cathodic peak of the ZMO shifts to lower potential and the intensities of redox peaks decrease upon cycling.…”

Zinc Manganate: Synthesis, Characterization, and Electrochemical Application toward Flufenamic Acid Detection

“…Zinc manganate­(ZnMnO)-based electrode materials have been well-recognized for their electrocatalytic redox characteristics and the nanoscale structure, which facilitates a fast electron transfer process that is advantageous for electrochemical applications. − Very recently, Li et al reported ZnMnO/graphene for the electrochemical detection of hydrogen peroxide (H 2 O 2 ) with good catalytic activity . Subsequently, Li et al explored a ZnMnO-based electrocatalyst for the determination of H 2 O 2 .…”