Unlocking the Zn storage performance of ammonium vanadate nanoflowers as high-capacity cathodes for aqueous zinc-ion batteries via potassium ion and ethylene glycol co-intercalation engineering

K + and ethylene glycol are co-inserted into the intermediate layer of NH 4 V 4 O 10 to regulate the interplanar spacing, oxygen deficiency, redox activity and micromorphology, boosting the zinc storage activity of the material.