Amorphization Boost Multi‐Ions Storage for High‐Performance Aqueous Batteries

Abstract

Regarding the complex properties of various cations, the design of aqueous batteries that can simultaneously store multi-ions with high capacity and satisfactory rate performance is a great challenge. Here an amorphization strategy to boost cation-ion storage capacities of anode materials is reported. In monovalent (H + , Li + , K + ), divalent (Mg 2+ , Ca 2+ , Zn 2+ ) and even trivalent (Al 3+ ) aqueous electrolytes, the capacity of the resulting amorphous MoO x is more than quadruple than that of crystalline MoO x and exceeds those of other reported multiple-ion storage materials. Both experimental and theoretical calculations reveal the generation of ample active sites and isotropic ions in the amorphous phase, which accelerates cation migration within the electrode bulk. Amorphous MoO x can be coupled with multi-ion storage cathodes to realize electrochemical energy storage devices with different carriers, promising high energy and power densities. The power density exceeded 15000 W kg −1 , demonstrating the great potential of amorphous MoO x in advanced aqueous batteries.

Deprotonated of layered double hydroxides during electrocatalytic water oxidation for multi‐cations intercalation

“…[2][3][4] Abundant and non-toxic multi-ion cations, for example, Na þ , K þ , Ca 2þ , Mg 2þ offer better opportunities for large-scale applications. [5,6] Despite continuous progress, only few materials (e.g., MXene [7] , MoS 2 [8,9] , MoO x [10] , Prussian blue analogue [11] and organic polymers [12,13] ) have been successfully explored for reversible multiple-cation intercalation. Unfortunately, these materials either performed as anode for cation intercalation or exhibits low theorical capacity in positive potential window, which means these materials cannot work as cathodes for various cations storage.…”

Mechanistic Insights of Zn‐Ion Storage in Synergistic Vanadium‐Based Composites

“…Considering the increasing cost of limited lithium resources and the safety issues arising from the inherent chemical activity of DOI: 10.1002/adfm.202312773 lithium metal and its flammable ester electrolyte, aqueous batteries have recently been considered promising alternatives, particularly for large-scale energy storage stations. [1][2][3][4][5][6] Of all the various aqueous batteries, aqueous zinc ion batteries (AZ-IBs) are receiving increasing attention due to the unique advantages of zinc's high theoretical capacity (820 mA h g −1 ), low electrode potential (−0.76 V versus standard hydrogen electrodes), good stability in water, simple manufacturing process and nontoxicity. [7][8][9][10][11][12][13][14][15][16] However, the development of AZIBs is hampered by the slow kinetics of the divalent charge Zn 2+ in the cathode material due to solid electrostatic interactions and suboptimal cycle life.…”

In Situ Induced Interface Engineering in Hierarchical Fe3O4 Enhances Performance for Alkaline Solid-State Energy Storage

“…Compared to external-assisted methods, self-optimized strategies, such as interface engineering, strain engineering, and grain boundaries engineering have been implemented to regulate inherent properties, which not only enable to avoid the concerns caused by external-assisted strategies but also encourage the thermodynamic and kinetic characteristics. − Recently, interface engineering has been deemed as an effective method to boost the intrinsic activity of materials. Besides, construction of amorphous–crystalline heterointerface allows to reduce the ion diffusion distance, accelerate the charge transfer, offer abundant active sites, and further enhance the electrochemical performance. − However, previously reported studies generally build limited interface by simply combining two different bulk phases and further fabricating core (crystalline phase)-shell (amorphous)-like structure with the aid of complicated steps, resulting in restrictive performance improvement. − Comparably, the construction of a three-dimensional (3D) heterointerface network could achieve greatly improved bulk phase interface regulation, which facilitates the maximum of interface effect and further boosts energy storage capability. Furthermore, heterointerface can generate strain force due to lattice mismatch, which favors the adjustment of electronic structure via shifting d-band, decreases the reaction energy barrier, and finally accelerates reaction kinetics. , To be more specific from our view, constructing self-supporting electrodes with combined advantages including abundant heterointerface, grain boundaries, and mesoporous is a promising research direction for optimizing the thermodynamic and kinetic characteristics and further boosting the overall electrochemical performances.…”