Superior cycling stability of H0.642V2O5·0.143H2O in rechargeable aqueous zinc batteries

Abstract

To increase the service life of rechargeable batteries, transition metal oxide hosts with high structural stability for the intercalation of carrier ions are important. Herein, we reconstruct the crystal structure of a commercial V 2 O 5 by pre-intercalating H + and H 2 O pillars using a facile hydrothermal reaction and obtain a bi-layer structured H 0.642 V 2 O 5 •0.143H 2 O (HVO) as an excellent host for aqueous Zn-ion batteries. Benefiting from the structural reconstruction, the irreversible "layer-to-amorphous" phase evolution during cycling is considerably less, resulting in ultra-high cycling stability of HVO with nearly no capacity fading even after 500 cycles at a current density of 0.5 A g −1 . Moreover, a synthetic proton and Zn 2+ intercalation mechanism in the HVO host is demonstrated. This work provides both a facile synthesis method for the preparation of V-based compounds and a new viewpoint for achieving high-performance host materials.

Dual intercalation of inorganics–organics for synergistically tuning the layer spacing of V2O5·nH2O to boost Zn2+ storage for aqueous zinc-ion batteries

“…With the development of globalization, energy consumption and environmental pollution have become increasingly serious issues, and the need to promote the utilization of solar energy and other new energy sources has become extremely urgent. [1][2][3][4] Currently, mature lithium-ion batteries (LIBs) are extensively used in the market because of their superior high energy density. However, their future growth has been limited by a number of key issues, such as resource issues and security.…”

Modulating the Proton‐Conducting Lanes in Spinel ZnMn2O4through Off‐Stoichiometry

“…We note that proton storage in the cathode of AZIBs will inevitably give rise to an increase in pH of the electrolyte, and the accumulation of OH − therein will eventually lead to the formation of Zn 4 SO 4 (OH) 6 ·5H 2 O on the cathode surface. [ 43,59,60 ] Therefore, the above results imply a predominance of reversible proton intercalation in Zn 0.5 Mn 2 O 4 and ZnMn 2 O 4 . This can be further verified by the XPS O 1s spectra, which reveal a remarkable increase in the Mn‐O‐H peak intensity upon discharge and its subsequent decrease upon charge (Figure 3d and Figure S22, Supporting Information).…”

In Situ Electrochemically Transforming VN/V2O3 Heterostructure to Highly Reversible V2NO for Excellent Zinc Ion Storage

“…[2] As a result, vanadium-based compounds are favorable for engineering advanced cathodes. In the past few years, an assortment of related materials, such as V 2 O 3 , [25][26][27] VO 2 , [28][29][30] VN, [31,32] Zn 0.3 V 2 O 5 •1.5H 2 O, [24] NaV 3 O 8 •1.5H 2 O, [14] Zn 3 (OH) 2 V 2 O 7 •2H 2 O, [33] Zn 2 (OH)VO 4 , [34] K 2 V 8 O 21 , [35] Ba 1.2 V 6 O 16 •3H 2 O, [36] CaV 6 O 16 •3H 2 O, [13] V 2 CT x MXene, [37] VN x O y , [38,39] Na 3 V 2 (PO 4 ) 2 F 3, [40] and H 0.642 V 2 O 5 • 0.143H 2 O, [41] has been designed for zinc ion storage to improve the cycling stability and capacity. The V 2 O 3 phase has a high specific capacity (715 mAh g À1 ).…”