Chemical synthesis of battery grade super-iron barium and potassium Fe(VI) ferrate compounds

Licht, Stuart; Naschitz, Vera; Liu, Bing; Ghosh, Susanta; Halperin, Nadezhda; Halperin, Leonid; Rozen, Dmitri

doi:10.1016/s0378-7753(00)00658-3

Cited by 68 publications

(86 citation statements)

References 13 publications

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“…Conventionally, Fe(VI) has always been prepared from alkaline hypochlorite oxidation of Fe(III) salts [10,16,17]. However, at sufficiently anodic potentials, an iron (metal) anode can be directly oxidized to the Fe(VI) species (FeO 4 2-) in alkaline media, in accord with the oxidation reaction [31]:…”

Section: Fundamentals Of Electrochemical Fe(vi) Synthesismentioning

confidence: 99%

“…In conventional chemical syntheses, high purity, stable K 2 FeO 4 is prepared, from alkaline hypochlorite oxidation of Fe(III), and less soluble Fe(VI) salts are prepared by precipitation, upon addition of various salts to solutions containing dissolved FeO 4 2- [16,17]. Electrochemical methodologies for Fe(VI) synthesis have recently been developed [23,28,30,31,34,[51][52][53][54][55].…”

Section: Introductionmentioning

confidence: 99%

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Advances in electrochemical Fe(VI) synthesis and analysis

Licht

2008

J Appl Electrochem

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Hexavalent iron species (Fe(VI)) have been known for over a century, and have long-time been investigated as the oxidant for water purification, as the catalysts in organic synthesis and more recently as cathodic charge storage materials. Conventional Fe(VI) syntheses include solution phase oxidation (by hyphchlorite) of Fe(III), and the synthesis of less soluble super-irons by dissolution of FeO 4 2-, and precipitation with alternate cations. This paper reviews a new electrochemical Fe(VI) synthesis route including both in situ and ex situ syntheses of Fe(VI) salts. The optimized electrolysis conditions for electrochemical Fe(VI) synthesis are summarized. Direct electrochemical synthesis of Fe(VI) compounds has several advantages of shorter synthesis time, simplicity, reduced costs (no chemical oxidant is required) and providing a possible pathway towards more electro-active and thermal stable Fe(VI) compounds. Fe(VI) analytical methodologies summarized in this paper are a range of electrochemical techniques. Fe(VI) compounds have been explored as energy storage cathode materials in both aqueous and non-aqueous phase in ''super-iron'' battery configurations. In this paper, electrochemical synthesis of reversible Fe(VI/III) thin film towards a rechargeable super-iron cathode is also summarized.

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Section: Fundamentals Of Electrochemical Fe(vi) Synthesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advances in electrochemical Fe(VI) synthesis and analysis

Licht

2008

J Appl Electrochem

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“…Development Reference 1999 introduction of super-iron charge storage & super-iron alkaline battery [5] 2000** introduction of super-iron lithium primary (single discharge) battery [7] 2001 demonstration of the solid state stability of the hexavalent iron [8] 1999-5 chemical syntheses of an array of super-iron salts [5,7,[9][10][11][12][13][14][15][16] 2000-4 inexpensive, electrochemical syntheses of super-iron salts [17][18][19][20][21][22][23][24][25][26] 2003-5** electrolyte optimization for super-iron lithium batteries [27,28] 2003 reversibility of alkaline, nanothick (3 nm) Fe(VI) cathodes [29] 2006 rechargeable alkaline super-iron battery [30] 2006** reversibility of non-aqueous, nanothick (3 nm) Fe(VI) cathodes [31] 2007-8 zirconia encapsulation-stabilization of alkali super-irons [32][33][34][35] 2009** rechargeable super-iron lithium battery, 4 V cathode [6] **=lithium super-iron battery development.…”

Section: Yearmentioning

confidence: 99%

“…FTIR provides not only a specific "fingerprint" distinguishing the various Fe(VI) oxides, as shown in Figure 5, but importantly we have also developed it as a quantitative technique to determine the Fe(VI) salt purity through the addition of a standardized BaSO 4 salt [8]. Discharge of cathode replaced, commercial alkaline button cells provides rapid screening of the redox activity of alternative salts [6,10,11,14,15,19,[27][28][29][30][31][32][33][34][35].…”

Section: Characterization Of Super-iron Cathode Filmsmentioning

confidence: 99%

A High Capacity Li-Ion Cathode: The Fe(III/VI) Super-Iron Cathode

Licht

2010

Energies

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A super-iron Li-ion cathode with a 3-fold higher reversible capacity (a storage capacity of 485 mAh/g) is presented. One of the principle constraints to vehicle electrification is that the Li-ion cathode battery chemistry is massive, and expensive. Demonstrated is a 3 electron storage lithium cathodic chemistry, and a reversible Li super-iron battery, which has a significantly higher capacity than contemporary Li-ion batteries. The super-iron Li-ion cathode consists of the hexavalent iron (Fe(VI)) salt, Na 2 FeO 4 , and is formed from inexpensive and clean materials. The charge storage mechanism is fundamentally different from those of traditional lithium ion intercalation cathodes. Instead, charge storage is based on multi-electron faradaic reduction, which considerably enhances the intrinsic charge storage capacity.

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“…The key point of enhancing electrochemical properties of BaFeO 4 batteries lies in how to hold a stable and continuous discharging reaction. In order to solve this problem, namely, to enhance the electrochemical performance of BaFeO 4 batteries, some additives with different mechanisms were added into the ferrate electrode, for example, MnO 2 , KMnO 4 [6][7][8][9][10][11], and nano-SrTiO 3 [12] etc., by the literature reports. In this study, the electrochemical performance of BaFeO 4 was researched, a new additive K 2 S 2 O 8 was added, and the property was compared with other additives.…”

Section: Introductionmentioning

confidence: 99%

Effects of additives and surface treatment on electrochemical performance for bafeo4 electrode

Wang

Zhao

Lai

et al. 2008

Ionics

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BaFeO 4 was prepared by using the raw material K 2 FeO 4 . The structure of the product was characterized by X-ray diffraction and infrared radiation. Particle size and morphology were analyzed by SEM. BaFeO 4 , the mixture of BaFeO 4 , and additives were used as cathode, zinc used as anode, with which discharge performance test was carried out in the KOH electrolyte with a concentration of 14 mol/L. The results show that the discharge performance of BaFeO 4 is obviously enhanced, the discharge platform is increased by 0.3 V, and the capacity reached up to 240 mAh/ g, increased by 40 mAh/g after 5% of K 2 S 2 O 8 was added. In addition, the discharge capacity is increased by 65 mAh/g via treating the electrode surface with TiO 2 sol, reached up to 265 mAh/g, and electrochemical performance is obviously improved. The reason of improving property is discussed in the work too.

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Chemical synthesis of battery grade super-iron barium and potassium Fe(VI) ferrate compounds

Cited by 68 publications

References 13 publications

Advances in electrochemical Fe(VI) synthesis and analysis

Advances in electrochemical Fe(VI) synthesis and analysis

A High Capacity Li-Ion Cathode: The Fe(III/VI) Super-Iron Cathode

Effects of additives and surface treatment on electrochemical performance for bafeo4 electrode

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