Journal
CHEMICAL ENGINEERING JOURNAL
Volume 468, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.143600
Keywords
Zn3V3O8 hybrid cathode; Valence engineering; Flexible; Aqueous zinc-ion batteries
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By reasonable structural design, a spherical glucose-derived carbon-regulated defect state Zn3V3O8 bimetallic oxide (CS@ZVO) cathode was synthesized. This design prevents the structural collapse during the cycle process, leading to a significant improvement in the cycle stability of aqueous zinc-ion batteries (AZIBs). The introduction of glucose-derived carbon can shift the valence state of vanadium in the ZVO bimetallic oxide cathode towards reduction, thereby significantly improving its zinc-ion storage capacity. The resulting CS@ZVO cathode exhibits a high discharge capacity of 154 mAh g(-1) at 1 A g(-1) after 100 cycles and a stable lifespan of 2000 cycles at 5 A g(-1).
Bimetallic oxides have received extensive attention as cathode materials in aqueous zinc-ion batteries (AZIBs) due to their effective multi-electron storage mechanism. However, their capacity still falls short of the current demand. In this study, through reasonable structural design, we synthesized spherical glucose-derived carbon-regulated defect state Zn3V3O8 (ZVO) bimetallic oxide (CS@ZVO) cathode. Such a design avoids the layered accumulation of electrode materials, which prevents the structural collapse during the cycle process, leading to a significant improvement in the cycle stability of AZIBs. Additionally, the introduction of glucose-derived carbon can shift the valence state of vanadium in the ZVO bimetallic oxide cathode towards reduction, thereby significantly improving its Zn-ion storage capacity. The resulting CS@ZVO cathode manifests a high discharge capacity of 154 mAh g(-1) at 1 A g(-1) after 100 cycles and a stable lifespan of 2000 cycles at 5 A g(-1). We also constructed a flexible and foldable AZIB using a hydrogel electrolyte, which operates with a specific capacity of up to 230 mAh g(-1) at 0.5 A g(-1) and can be bent and folded arbitrarily when working. This strategy for regulating the valence state of bimetallic oxides offers a promising path for the development of cathode materials in flexible AZIBs.
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