Cation-Deficient Spinel ZnMn₂O₄ Cathode in Zn(CF₃SO₃)₂ Electrolyte for Rechargeable Aqueous Zn-Ion Battery

Abstract

Rechargeable aqueous Zn-ion batteries are attractive cheap, safe and green energy storage technologies but are bottlenecked by limitation in high-capacity cathode and compatible electrolyte to achieve satisfactory cyclability. Here we report the application of nonstoichiometric ZnMnO/carbon composite as a new Zn-insertion cathode material in aqueous Zn(CFSO) electrolyte. In 3 M Zn(CFSO) solution that enables ∼100% Zn plating/stripping efficiency with long-term stability and suppresses Mn dissolution, the spinel/carbon hybrid exhibits a reversible capacity of 150 mAh g and a capacity retention of 94% over 500 cycles at a high rate of 500 mA g. The remarkable electrode performance results from the facile charge transfer and Zn insertion in the structurally robust spinel featuring small particle size and abundant cation vacancies, as evidenced by combined electrochemical measurements, XRD, Raman, synchrotron X-ray absorption spectroscopy, FTIR, and NMR analysis. The results would enlighten and promote the use of cation-defective spinel compounds and trifluoromethanesulfonic electrolyte to develop high-performance rechargeable zinc batteries.

Stabilized Molybdenum Trioxide Nanowires as Novel Ultrahigh‐Capacity Cathode for Rechargeable Zinc Ion Battery

“…Specifically, it is able to keep more than 70.4% of its original capacity after 400 cycles, dramatically higher than the aqueous one (27.1%) and comparable to the recently reported Zn ion batteries. [9,17,33,[45][46][47]49,50] while the corresponding calculated the C Mo values are shown in Figure 4c. In addition, the C Mo of aqueous and quasisolid state electrolytes after different charge/discharge cycles were also monitored when the MoO 3 cathodes were applied to fabricate devices.…”

“…[1][2][3][4][5][6][7][8] As one of the most promising energy storage devices, aqueous zinc-ion batteries (ZIBs) has gained ever-increasing attention on account of its outstanding safety, high theoretical capacity (Zn: ≈820 mAh g −1 ), low cost as well as environmental benignity. [16][17][18] Despite these advanced features, one of the biggest block for ZIBs developed to date is their relatively low capacity in terms of the substantially inferior capacity of cathode materials than Zn anode. [16][17][18] Despite these advanced features, one of the biggest block for ZIBs developed to date is their relatively low capacity in terms of the substantially inferior capacity of cathode materials than Zn anode.…”

“…[16][17][18] Despite these advanced features, one of the biggest block for ZIBs developed to date is their relatively low capacity in terms of the substantially inferior capacity of cathode materials than Zn anode. [21][22][23][24] A great variety of materials including MnO 2 , [25][26][27][28] ZnMn 2 O 4 , [17] Zn x Mo 6 S 6 , [29] ZnHCF, [30] Zn 0.25 V 2 O 5 ·nH 2 O, [31] VS 2 , [20] NiOOH, [32] and Co 3 O 4 [9] have been reported as promising cathodes with good electrochemical performance. [21][22][23][24] A great variety of materials including MnO 2 , [25][26][27][28] ZnMn 2 O 4 , [17] Zn x Mo 6 S 6 , [29] ZnHCF, [30] Zn 0.25 V 2 O 5 ·nH 2 O, [31] VS 2 , [20] NiOOH, [32] and Co 3 O 4 [9] have been reported as promising cathodes with good electrochemical performance.…”

Rechargeable Aluminum/Iodine Battery Redox Chemistry in Ionic Liquid Electrolyte

“…[1][2][3][4][5][6][7][8][9] Rechargeable aluminum ion batteries (RABs) have been considered one of the most promising next-generation rechargeable battery because Al is the most abundant metal element in earth's crust, and it can provide a remarkable volumetric capacity (8.05 Ahcm -3 ), which is four times higher than that of lithium.…”

Highly Reversible and Rechargeable Safe Zn Batteries Based on a Triethyl Phosphate Electrolyte

“…[1] Historically,t he Zn anode has been used with aqueous electrolytes in either alkaline or neutral solution. [3] Thee mergence of neutral aqueous electrolytes is asignificant step forward, but the low CE of Zn redox couples in aqueous systems still remains ac hallenge.R ecently,t hree-dimensional Zn anodes [3] and high-concentration aqueous electrolytes were introduced to increase the stability of Zn anodes [4] and it seems that this approach provides acomprehensive solution to anodic issues in aqueous electrolytes.H owever,a nother possibility for the future of Zn anodes is to look beyond water-based electrolytes. [3] Thee mergence of neutral aqueous electrolytes is asignificant step forward, but the low CE of Zn redox couples in aqueous systems still remains ac hallenge.R ecently,t hree-dimensional Zn anodes [3] and high-concentration aqueous electrolytes were introduced to increase the stability of Zn anodes [4] and it seems that this approach provides acomprehensive solution to anodic issues in aqueous electrolytes.H owever,a nother possibility for the future of Zn anodes is to look beyond water-based electrolytes.…”