CaV6O16·2.8H2O with Ca2+ Pillar and Water Lubrication as a High‐Rate and Long‐Life Cathode Material for Ca‐Ion Batteries

Wang, Junjun; Wang, Jianxiang; Jiang, Yalong; Xiong, Fangyu; Shi, Tan; Fan, Qiao; Chen, Jinghui; An, Qinyou; Mai, Liqiang

doi:10.1002/adfm.202113030

Cited by 41 publications

(39 citation statements)

References 43 publications

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“…Compared with the original sample, the cycled VOPO 4 ·2H 2 O displays a discernible (001) peak right shift, which is due to the escape of the water or the irreversible insertion of Al 3+ . [ 20 ] Therefore, the TGA was conducted to figure out the water contents before and after cycling. As displayed in Figure 2e, it can be clearly observed for the decreased water content in the cycled VOPO 4 ·2H 2 O, corroborating the water escape during cycling.…”

Section: Resultsmentioning

confidence: 99%

Water‐Stabilized Vanadyl Phosphate Monohydrate Ultrathin Nanosheets toward High Voltage Al‐Ion Batteries

Zheng

Xia

et al. 2023

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storage system, which would propel the substantial development of the energy storage technology. [4] In order to design high energy density storage devices, the identifying of host materials with high performance, especially elevated work potential, is essential. Due to the high electronegativity of oxygen, the metal oxides own strong ionic chemical bonds, which consequently result in increased plateau voltages. [5] Examples of such oxides owning potential high discharge voltages are amorphous V 2 O 5 (≈0.9 V), [6] MoO 2 (1.9 V), [7] TiO 2 (≈1.0 V) [8] and so on. Despite their advantage in working potential, they usually suffer from low capacity, discontented cycling life, and inferior rate capability, which originate from the slow reaction kinetics caused by the strong Coulombic interaction between the trivalent Al 3+ and oxide host lattice. [9] Previous researches have demonstrated that water molecules can be applied as "lubricant" to facilitate ions diffusion. [10] Typically, vanadyl phosphate dihydrate (VOPO 4 •2H 2 O) with a long intercalation chemistry history, has been recently developed as a potential cathode material for various alkali metalion batteries, meriting from its high redox reaction potential due to the strong inductive effect of [PO 4 ] tetrahedrons and the large interlayer space stemming from the interlayer water molecules. [11] Moreover, the easier multivalent ions (Mg 2+ and Zn 2+ ) intercalation into VOPO 4 •2H 2 O can take place with the aid of the water molecules. [11e,12] The study of vanadyl phosphate hydrate as AIBs cathode was first reported in 2020 by Wang and co-workers via fabricating a VOPO 4 -graphene heterostructure. [11f ] Although an improved cycling performance originating from its zero-strain property is achieved, the potential high discharge plateau voltage and capacity of vanadyl phosphate hydrate are underutilized. In addition, the effect and mechanism of the bonded water molecule content and its stability on the aluminum storage behavior have not been systematically studied.In this work, we select VOPO 4 •2H 2 O as a model cathode to reveal its Al 3+ storage behaviors. As expected, the VOPO 4 •2H 2 O presents high discharge plateau and holds high potential Al 3+ storage capacity. We further investigate the relationship between water content and electrochemical performance. Interestingly, our density functional theory (DFT) calculations results reveal that, compared with VOPO 4 •2H 2 O and VOPO 4 , the VOPO 4 •H 2 O possesses the lowest Al 3+ diffusion barrier and Al ion batteries (AIBs) are attracting considerable attention owing to high volumetric capacity, low cost, and high safety. However, the strong electrostatic interaction between Al 3+ and host lattice leads to discontented cycling life and inferior rate capability. Herein, a new strategy of employing water molecules contained VOPO 4 •H 2 O to boost Al 3+ migration via the charge shielding effect of water is reported. It is revealed that VOPO 4 •H 2 O with water lubrication effect and smaller steric hindrance ...

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Section: Resultsmentioning

confidence: 99%

Water‐Stabilized Vanadyl Phosphate Monohydrate Ultrathin Nanosheets toward High Voltage Al‐Ion Batteries

Zheng

Xia

et al. 2023

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“…[26] Confining a certain amount of Al 3 + and H 2 O between the layers can expand the interlayer spacing of vanadium oxide and stabilize the layered structure. [27] For comparison, we synthesized and obtained the TEM and HRTEM images of pure V 6 O 13 , as shown in Figures S21 a and b (Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Co‐Intercalation of Dual Charge Carriers in Metal‐Ion‐Confining Layered Vanadium Oxide Nanobelts for Aqueous Zinc‐Ion Batteries

Zhu

Dong

et al. 2022

Angewandte Chemie

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Vanadium-based oxides with high theoretical specific capacities and open crystal structures are promising cathodes for aqueous zinc-ion batteries (AZIBs). In this work, the confined synthesis can insert metal ions into the interlayer spacing of layered vanadium oxide nanobelts without changing the original morphology. Furthermore, we obtain a series of nanomaterials based on metal-confined nanobelts, and describe the effect of interlayer spacing on the electrochemical performance. The electrochemical properties of the obtained Al 2.65 V 6 O 13 • 2.07H 2 O as cathodes for AZIBs are remarkably improved with a high initial capacity of 571.7 mAh • g À 1 at 1.0 A g À 1 . Even at a high current density of 5.0 A g À 1 , the initial capacity can still reach 205.7 mAh g À 1 , with a high capacity retention of 89.2 % after 2000 cycles. This study demonstrates that nanobelts confined with metal ions can significantly improve energy storage applications, revealing new avenues for enhancing the electrochemical performance of AZIBs.

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“…Our group reported that Mg 0.25 V 2 O 5 ÁH 2 O with the pre-intercalation of Mg 2+ and H 2 O molecules 24 and CaV 6 O 16 Á3H 2 O with the pre-intercalation of Ca 2+ and H 2 O molecules. 25 The pre-intercalation of H 2 O molecules between the layers of V 2 O 5 can partially shield the electrostatically attractive forces between Ca 2+ and oxygen anions, leading to mild interaction and cycling stability. 24 However, Mg 0.25 26,27 Except for the pillar effect of H 2 O molecules, CVO possesses double electrochemical active sites enabled by M and V bimetallic redox, which is demonstrated in other electrochemical systems.…”

Section: Introductionmentioning

confidence: 99%

Cu₃(OH)₂V₂O₇·2H₂O@rGO with bimetallic redox activity as a novel cathode material for calcium–ion batteries

et al. 2023

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CaV₆O₁₆·2.8H₂O with Ca²⁺ Pillar and Water Lubrication as a High‐Rate and Long‐Life Cathode Material for Ca‐Ion Batteries

Cited by 41 publications

References 43 publications

Water‐Stabilized Vanadyl Phosphate Monohydrate Ultrathin Nanosheets toward High Voltage Al‐Ion Batteries

Water‐Stabilized Vanadyl Phosphate Monohydrate Ultrathin Nanosheets toward High Voltage Al‐Ion Batteries

Co‐Intercalation of Dual Charge Carriers in Metal‐Ion‐Confining Layered Vanadium Oxide Nanobelts for Aqueous Zinc‐Ion Batteries

Cu₃(OH)₂V₂O₇·2H₂O@rGO with bimetallic redox activity as a novel cathode material for calcium–ion batteries

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CaV6O16·2.8H2O with Ca2+ Pillar and Water Lubrication as a High‐Rate and Long‐Life Cathode Material for Ca‐Ion Batteries

Cited by 41 publications

References 43 publications

Water‐Stabilized Vanadyl Phosphate Monohydrate Ultrathin Nanosheets toward High Voltage Al‐Ion Batteries

Water‐Stabilized Vanadyl Phosphate Monohydrate Ultrathin Nanosheets toward High Voltage Al‐Ion Batteries

Co‐Intercalation of Dual Charge Carriers in Metal‐Ion‐Confining Layered Vanadium Oxide Nanobelts for Aqueous Zinc‐Ion Batteries

Cu3(OH)2V2O7·2H2O@rGO with bimetallic redox activity as a novel cathode material for calcium–ion batteries

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CaV₆O₁₆·2.8H₂O with Ca²⁺ Pillar and Water Lubrication as a High‐Rate and Long‐Life Cathode Material for Ca‐Ion Batteries

Cu₃(OH)₂V₂O₇·2H₂O@rGO with bimetallic redox activity as a novel cathode material for calcium–ion batteries