Lithium insertion chemistry of some iron vanadates

Abstract

Lithium insertion into various iron vanadates has been investigated. Although the potential profiles change significantly between the first and subsequent discharges, capacity retention is unexpectedly good. Other phases, structurally related to FeVO 4 , containing copper and/or sodium ions were also studied. One of these, β-Cu 3 Fe 4 (VO 4 ) 6 , reversibly consumes almost 10 moles of electrons per formula unit (ca. 240 mAh g -1 ) between 3.6 and 2.0 V vs. Li + /Li, in a non-classical insertion process. It is proposed that both copper and vanadium are electrochemically active, whereas iron(III) reacts to form LiFe III O 2 . The capacity of the Cu 3 Fe 4 (VO 4 ) 6 /Li system is nearly independent of cycling rate, stabilizing after a few cycles at 120-140 mAh g -1 . Iron vanadates exhibit better capacities than their phosphate analogues, whereas the latter display more constant discharge potentials.

Electrostatic spray deposition of porous Fe2V4O13 films as electrodes for Li-ion batteries

“…For the crystalline Fe 2 V 4 O 13 thin film, it can deliver a specific capacity of 409 mAh g −1 in the first discharge step and the initial capacity loss is about 19.7%. Patoux et al believe that iron in Fe 2 V 4 O 13 might be partly electrochemically active [20].Šurca et al conclude based on their ex situ IR spectroscopy on the Fe 2 V 4 O 13 electrode that during the discharge process V 5+ and Fe 3+ ions can be both reduced [19]. Hence both V 5+ and Fe 3+ in our Fe 2 V 4 O 13 samples are also believed to be electrochemically active in the voltage range of 1.0-4.0 V. For the amorphous Fe 2 V 4 O 12.29 film, it delivers a specific capacity of 349.9 mAh g −1 in the first discharge step and 244.9 mAh g −1 in the second discharge step with the initial capacity loss of 30%.…”

“…Recently, Patoux et al introduced carbon black as a conductive additive in the crystalline Fe 2 V 4 O 13 electrode, which showed good cycling performance in the voltage range of 2.0-3.6 V [20]. Enhanced electrical conductivity during the lithiation and delithiation of the Fe 2 V 4 O 13 electrode was believed to be the key factor for the improvement.…”

Thermodynamic, lattice dynamical, and elastic properties of iron‐vanadium oxides from experiments and first principles

“…In recent years, vanadates have attracted lots of attention due to their unusual electrochemical, redox properties, and potential applications as sodium-ion batteries, photoanodes, supercapacitors, gas sensors, and so on. [1][2][3][4][5][6][7] Especially, iron vanadates FeVO 4 , Fe 2 V 4 O 13 , FeV 2 O 4 , and FeV 3 O 8 semiconductors exhibit narrow bandgap, high chemical stability, eco-friendly, and low-cost, which make them become promising photoelectrode materials for solar photoelectrochemical water splitting, [8][9][10][11][12][13] lithium-ion batteries, [14][15][16][17][18] and Fenton-like catalysts for degradation of organic pollutant. 19,20 In order to understand the conditions of chemical reactivity and thermodynamic stability of these iron-vanadium oxides in practical applications, a thorough knowledge of thermodynamic properties is indispensable.…”

Pseudocapacitive Behavioral Testing of Iron Vanadate Nanoparticles Synthesized by Simple Co- Precipitation Method

“…In connection with this, iron vanadate has various merits including its availability in nature, low toxicity, chemical stableness and user friendly in fabrication process. A wide variety of iron vanadate had been synthesized and investigated as they possess various application [7][8][9][10][11][12][13][14][15].…”