Temperature-dependent properties of FePO4 cathode materials

Song, Yanning; Yang, Shoufeng; Zavalij, Peter Y.; Whittingham, M. Stanley

doi:10.1016/s0025-5408(02)00771-7

Cited by 125 publications

(99 citation statements)

References 18 publications

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“…As mentioned above, it is obvious that such a performance is closely linked to the electrode surface area [23,24]. A similar behavior of good performance was observed by other authors [6][7][8], who explained it by the increase of the amorphous phase content as T c decreased. In spite of the higher surface value of the sample calcinated at 350°C, this latter shows an opposite trend, very likely because its structure being not well defined (cf.…”

Section: Tg Analysissupporting

confidence: 81%

“…It should be mentioned that the synthesis conditions used here give rise to a crystalline phase at temperatures well below those reported in the literature [6][7][8].…”

Section: Tg Analysismentioning

confidence: 68%

“…Prosini et al [6,7] and Song et al [8] characterized its electrochemical behavior as Li + -intercalation host and stated that the performances of this material are primarily related with its amorphous character. In the present study, we exploited the advantages of a sol-gel synthesis to yield a material with high specific surface area (low grain size), and we report on the behavior of this compound, prepared in the crystalline state, and look into the origin of its electrochemical activity.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical performances of FePO4-positive active mass prepared through a new sol–gel method

Kahoul

Hammouche

2009

Ionics

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This investigation is a contribution to the research on alternative cathode materials with much more promising performances for lithium batteries. It deals with the electrochemical properties of iron phosphate compound FePO 4 , chemically prepared through the so-called sol-gel Pechini process, terminated by a calcination of the product precursor at temperatures (T c ) ranging between 350°C and 650°C. A crystalline phase was obtained for temperatures ≥400°C. The particle size decreased with the decrease in T c , giving rise to a Brunauer-Emmett-Teller (BET)-specific surface area, S BET , as high as 28 m 2 g −1 for the sample annealed at 400°C. The electrochemical properties of FePO 4 -based composite cathodes were characterized on three-electrode laboratory cells. Charge-discharge cycling determined a maximum reversible capacity of 132 mAh g −1 , which fell with the increase in T c . A direct correlation was established between the activity of the material and its active surface area.

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Section: Tg Analysissupporting

confidence: 81%

“…It should be mentioned that the synthesis conditions used here give rise to a crystalline phase at temperatures well below those reported in the literature [6][7][8].…”

Section: Tg Analysismentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

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Electrochemical performances of FePO4-positive active mass prepared through a new sol–gel method

Kahoul

Hammouche

2009

Ionics

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“…The Fe 3+ / 2+ redox couple in the amorphous iron phosphate is reported [17] to be fully reversible than the crystalline counterpart. The crystalline FePO 4 phase is known to be electrochemically inactive [18]. Hence, in this work, synthesis temperature is chosen to be 200 °C.…”

Section: Synthesismentioning

confidence: 99%

Lithium intercalation into amorphous FePO4 cathode in aqueous solutions

Minakshi

2010

Electrochimica Acta

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Minakshi, M. (2010) Lithium intercalation into amorphousThis is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…Numerous studies [95][96][97][98] described the use of acidic solutions containing Fe 3+ and PO 4 3− ions, but the phases obtained were hydrated phases of phosphosiderite, with a strengite-type FePO 4 ·nH 2 O composition and giniite, Fe 3 (PO 4 ) 2 (OH) 2 ·nH 2 O. After heating these phases at 873 K, they transform to the α-quartz phase of FePO 4 [97][98][99]. FePO 4 with the α-quartz structure was studied by Raman scattering [100].…”

Section: α-Quartz Fepomentioning

confidence: 99%

Hydrothermal Crystal Growth of Piezoelectric α-Quartz Phase of AO2 (A = Ge, Si) and MXO4 (M = Al, Ga, Fe and X = P, As): A Historical Overview

Cambon

Haines

2017

Crystals

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Abstract:Quartz is the most frequently used piezoelectric material. Single crystals are industrially grown by the hydrothermal route under super-critical conditions (150 MPa-623 K). This paper is an overview of the hydrothermal crystal growth of the AO 2 and MXO 4 α-quartz isotypes. All of the studies on the crystal growth of this family of materials enable some general and schematic conclusions to be made concerning the influence of different parameters for growing these α-quartz-type materials with different chemical compositions. The solubility of the material is the main parameter, which governs both thermodynamic parameters, P and T, of the crystal growth. Then, depending on the chemistry of the α-quartz-type phase, different parameters have to be considered with the aim of obtaining the basic building units (BBU) of the crystals in solution responsible for the growth of the α-quartz-type phase. A schematic method is proposed, based on the main parameter governing the crystal growth of the α-quartz phase. All of the crystal growth processes have been classified according to four routes: classical, solute-induced, seed-induced and solvent-induced crystal growth.

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Temperature-dependent properties of FePO4 cathode materials

Cited by 125 publications

References 18 publications

Electrochemical performances of FePO4-positive active mass prepared through a new sol–gel method

Electrochemical performances of FePO4-positive active mass prepared through a new sol–gel method

Lithium intercalation into amorphous FePO4 cathode in aqueous solutions

Hydrothermal Crystal Growth of Piezoelectric α-Quartz Phase of AO2 (A = Ge, Si) and MXO4 (M = Al, Ga, Fe and X = P, As): A Historical Overview

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