Simultaneous Incorporation of V and Mn Element into Polyanionic NASICON for High Energy‐Density and Long‐Lifespan Zn‐Ion Storage (Adv. Energy Mater. 23/2022)

Abstract

Aqueous Zinc‐ion Batteries In article number 2200654, Linfeng Hu and co‐workers develop NASICON‐typed V‐Mn transition metal phosphate, Na4VMn(PO4)3, as a cathode material for robust aqueous Zn‐ion storage. Taking advantage of its high‐voltage properties that originate from the inductive effect and two‐step electron transfer mechanism between V4+/V3+ and Mn3+/Mn2+ redox couple, the Na4VMn(PO4)3 cathode exhibits excellent overall battery performance with an energy density of 309.7 Wh kg−1, and good rate capacity and cycling stability (89.1% capacity retention after 3000 cycles).

In Situ Induced Coordination between a “Desiccant” Interphase and Oxygen‐Deficient Navajoite towards Highly Efficient Zinc Ion Storage

“…Compared to the overwhelming H 2 O and OH − signals assigned to ZVO at fully discharged HVO d electrode (Figure 6e), GP‐HVO d shows less variation of H 2 O peak during cycling, further verifying the significance of GP to retain the interfacial stability. The V 2p spectra from GP‐HVO d (Figure S22a, Supporting Information) show that V 5+ cations are partially reduced to V 4+ and V 3+ in discharge, which is highly reversible when charged back to 1.6 V. [ 34 ] Correspondingly, the intensity variation of Zn 2p characteristic peaks at 1045.4 and 1022.2 eV proves the high reversibility of Zn 2+ intercalation/deintercalation (Figure S22b, Supporting Information). [ 35 ] The uniform distribution of V, O, and Zn elements over the HVO d bulk phase in discharged GP‐HVO d electrode also verifies the successful Zn 2+ intercalation (Figure 6f).…”

Formation of CuMn Prussian Blue Analog Double‐Shelled Nanoboxes Toward Long‐Life Zn‐ion Batteries

“…The capacity contributions from the capacitive and diffusion behaviors can be determined by the formula: i = a v b , where the values of a and b are adjustable constants [43, 44] . By fitting the plots of log( i ) versus log( v ), the calculated b values of the peaks 1–4 are 0.86, 0.71, 0.65, and 0.86, respectively, demonstrating that the reactions at these peaks are synergistically controlled by capacitive and ionic diffusion behaviors (Figure S17b, Supporting Information) [45] . Furthermore, the capacitive contribution at a certain scan rate is evaluated.…”

Progress of Phosphate‐based Polyanion Cathodes for Aqueous Rechargeable Zinc Batteries

“…incorporate V and Mn elements simultaneously into NASICON structural compound hosts to utilize the electrochemical redox in both V and Mn elements for the achievement of high specific capacity in ARZBs. [ 93 ] Under the current density of 0.1 A g −1 , a specific capacity of 230.7 mAh g −1 with two distinct discharge plateaus at 1.55 V (V 4+ /V 3+ ) and 1.1 V (Mn 3+ /Mn 2+ ) was observed in Na 4 VMn(PO 4 ) 3 electrode, as shown in Figure a. Obviously, the Na 4 VMn(PO 4 ) 3 cathode could reach a higher specific capacity and average operating voltage as compared to Na 3 V 2 (PO 4 ) 3 .…”