Aluminium vanadate with unsaturated coordinated V centers and oxygen vacancies: surface migration and partial phase transformation mechanism in high performance zinc-ion batteries

Abstract

Aluminium vanadate with unsaturated coordinated V centers and oxygen vacancies shows excellent Zn2+ storage due to the low Zn2+ migration barrier along the (001) surface, the co-(de)intercalation mechanism of H+/Zn2+ and the partial transformation.

Potassium Ammonium Vanadate with Rich Oxygen Vacancies for Fast and Highly Stable Zn-Ion Storage

“…This is because the oxygen vacancies could be filled by the O 2− from water with the intercalation of Zn 2+ and water during the discharge process. 60 The lower EPR intensity of the fully discharged electrode further confirms the lower oxygen vacancy concentration (Figure S17). The intensity of O 3 (water molecule) becomes stronger at the fully discharged state due to the insertion of [Zn(H 2 O) 6 ] 2+ .…”

“…The intensity of O2 peak shows a decrease when discharging to 0.2 V, indicating the decrease of the content of oxygen vacancies. This is because the oxygen vacancies could be filled by the O 2– from water with the intercalation of Zn 2+ and water during the discharge process . The lower EPR intensity of the fully discharged electrode further confirms the lower oxygen vacancy concentration (Figure S17).…”

A cerium vanadate/S heterostructure for a long-life zinc-ion battery: efficient electron transfer by the anchored sulfur

“…4–6 Since Nazar's group first reported a Zn 2+ -intercalated hydrated V 2 O 5 cathode in a ZIB, 7 a series of metal-pre-intercalated vanadates (denoted as M x V 2 O 5 , M = metal) such as Co 0.247 V 2 O 5 ·0.944H 2 O nanobelts, 8 Ca 0.24 V 2 O 5 ·0.83H 2 O nanobelts 9 and honeycomb-like Mg 0.23 V 2 O 5 ·1.0H 2 O 10 have been used as ZIB cathodes. In our previous works, Al 3+ , 11 Mn 2+ , 12 Cr 3+ , 13 and Ni 2+ (ref. 14) were pre-intercalated into V 2 O 5 .…”

“…These compounds showed high capacities and enhanced cycling performances due to the expanded interlayer spacings/channels for the insertion/extraction of Zn 2+ . [8][9][10][11][12][13][14] Rare-earth metals possess special outer electron configurations; however, among the pre-intercalated metal ions, rare-earth metals such as Ce (4f 1 5d 1 6s2) have rarely been reported. On the other hand, the cycle lives of M x V 2 O 5 -type materials can be further improved.…”

Anthraquinone-intercalated V2O5 with Al3+ for superior zinc-ion batteries: reversible transformation between disorder and order

“…In our previous work, it was found that Al 0.17 V 2 O 5 (H 2 O) 2 ·H 2 O (AlVO) exhibited a satisfactory cycling performance although some of the pre-intercalated Al 3+ ions entered the electrolyte during the charge process. 12 Thus it is expected that if the electrolyte contains Al 3+ ions, partial Al 3+ ions can reversely intercalate into the organic species-doped V 2 O 5 during the discharge process to obtain a layered cathode with a dual-pillar of organic species and Al 3+ for long-life ZIBs.…”