期刊
CHEMICAL ENGINEERING JOURNAL
卷 433, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133795
关键词
Hydrated vanadium oxide; Bimetallic ion; Metal-ion intercalated; Aqueous zinc-ion batteries
资金
- Fundamental Research Funds for the Central Univer-sities [DUT21LK34]
- Natural Science Foundation of Liaoning Prov-ince [2020-MS-113]
Researchers successfully synthesized a new bimetallic ion intercalation VOH material KMgVOH, in which the interaction of Mg2+ and K+ greatly improved the electrochemical performance of the battery.
Because of many advantages, aqueous rechargeable zinc-ion batteries (ZIBs) have become the best alternative energy storage device to lithium-ion batteries (LIBs). Current studies have shown that the insertion of metal ions can adjust the layer spacing of hydrated vanadium oxide (V2O5 & BULL;nH(2)O, denoted as VOH) and improve their electrochemical performance. However, the specific role of different metal ions has not been studied. Here, we have synthesized a bimetallic ion intercalation VOH, in which a one-valent metal K+ and a divalent alkaline earth metal Mg2+ are simultaneously inserted into the VOH interlayer by a one-step hydrothermal method, denoted as KMgVOH. In this material, Mg2+ can increase the layer spacing of VOH, expand the ion transport channel and improve the specific capacity of the battery. Meanwhile, K+ can make the connection between V-O layers closer and stabilize the structure of the material. The interaction of the two ions greatly improves the electrochemical performance of VOH. This KMgVOH cathode delivers an unprecedented high specific capacity of 423 mAh.g(-1) at 0.1 A.g(-1), and the capacity can still reach 222 mAh.g(-1) after a long cycle. This improvement for vanadium-based materials provides a new idea for zinc ion storage.
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