CEJ: 3D assembled MXene@ spinel complex for water system zinc ion batteries

Rechargeable water-based zinc ion batteries (ZIBs) have attracted more and more attention due to their cost-effectiveness,non-toxic, naturally abundant zinc metal as a negative electrode andenvironmentally friendly neutral water-based

Figure 1. SEM,XRD, structure diagram of the prepared ZMO and Raman test at the central position of water system ZIBs

Figure 2. Cyclic stability of ZMO positive electrode (a) under 1 AG-1 in waterborne ZIBs, (b) non-in-situ XRD pattern, and (c) HRTEM image after repeated cycling

Figure 3. (a) Schematic diagram of preparation process of Zmo@ti3C2Tx composite material (b) Accordion-like stacked FESEM images of Ti3C2Tx composite material (C and D) FESEM images at different magnification, (e) EDS map image (f) XRD pattern and (g) Raman spectrum.

FIG. 4. Electrochemical performance of zmo@Ti3C2Tx composite as a positive electrode in waterborne ZIBs

Figure 5. Zmo@ Ti3C2Tx composite (a)1A g-1 long cycle performance (b) Capacity retention rate (C, d) Ectopic XRD of FESEM image (E) after 5000 cycles

FIG. 6. Preparation process and properties of Zmo@ti3C2Tx // Zn flexible Water ZIBs

This paper introduces the energy storage and cyclic degradation of ZMO when Zn 2+ is embedded/embedded, which is closely related to the reversible phase transition of spinel ZMO and MnO2 during charging and discharging. And the formation of irreversibly inactive ZnO by-products leads to a decrease in capacity after repeated cycles. Electrochemical mechanism elucidated the storage of ZMO in Aqueous solution of ZIB. On this basis, a new zmo@TI3C2TX composite was designed and prepared, in which the high conductivity Ti3C2Tx framework can effectively inhibit the irreversible structural degradation and side reactions of ZMO. The obtained zmo@ti3c2tx positive electrode in water-based ZIBs can provide 172.6 mAh G-1 invertible specific capacity, with high coulomb efficiency of about 100%, excellent multiplier performance and cycle stability (retention rate is about 92.4% after 5000 cycles). In this paper, a flexible water-based ZIB based on gel electrolyte has been constructed, which shows stable electrochemical performance under different mechanical conditions and can be used as a highly efficient flexible energy storage device in portable and wearable electronic devices. This work provides important insights into the mechanism of Zn 2+ storage and provides scientific evidence for the use of spinel ZMO and its complexes for high performance and durable water-based ZIBs.

Literature link:

https://doi.org/10.1016/j.cej.2020.125627

Source: MXene Frontie

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