Crystal structure and cation transport properties of the ortho - diphosphates Na7(MP2O7)4PO4 (M = Al, Cr, Fe)

Rochère, M. de la; Kahn, A.; d'Yvoire, F.; Bretey, E.

doi:10.1016/0025-5408(85)90023-6

Cited by 48 publications

(26 citation statements)

References 10 publications

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“…In all the samples pyrophosphate NaAl 1 − x Fe x P 2 O 7 with a composition from NaAlP 2 O 7 in the Fe free sample (x = 0) to NaFeP 2 O 7 in the Al free sample (x = 20) was found to be major phase. Additional sodium aluminum ortho-pyrophosphate Na 7 Al 4 (P 2 O 7 ) 4 PO 4 [42] or Na 6 Al 2 (P 2 O 7 ) 3 (Na 2 Al 0.67 P 2 O 7 ) [43] and sodium iron pyrophosphate Na 7 Fe 3 (P 2 O 7 ) 4 [44] were present in the samples at x = 0 and x = 20, respectively (Fig. 1c).…”

Section: Xrdmentioning

confidence: 77%

The effect of Fe 2 O 3 substitution for Al 2 O 3 on the phase composition and structure of sodium–aluminum–iron phosphate glasses

Stefanovsky

Кадыко

et al. 2015

Journal of Non-Crystalline Solids

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Section: Xrdmentioning

confidence: 77%

The effect of Fe 2 O 3 substitution for Al 2 O 3 on the phase composition and structure of sodium–aluminum–iron phosphate glasses

Stefanovsky

Кадыко

et al. 2015

Journal of Non-Crystalline Solids

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“…S1). Although the isostructures, Na 7 M 4 (P 2 O 7 ) 4 PO 4 (M = Al, Cr, and Fe), have been investigated (28), the vanadium version of this framework has been neither reported as a battery electrode material nor even documented in the materials database.…”

Section: Significancementioning

confidence: 99%

Role of intermediate phase for stable cycling of Na ₇ V ₄ (P ₂ O ₇ ) ₄ PO ₄ in sodium ion battery

Lim

Kim

Chung

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

139

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Sodium ion batteries offer promising opportunities in emerging utility grid applications because of the low cost of raw materials, yet low energy density and limited cycle life remain critical drawbacks in their electrochemical operations. Herein, we report a vanadium-based ortho-diphosphate, Na 7 V 4 (P 2 O 7 ) 4 PO 4 , or VODP, that significantly reduces all these drawbacks. Indeed, VODP exhibits single-valued voltage plateaus at 3.88 V vs. Na/Na + while retaining substantial capacity (>78%) over 1,000 cycles. Electronic structure calculations reveal that the remarkable single plateau and cycle life originate from an intermediate phase (a very shallow voltage step) that is similar both in the energy level and lattice parameters to those of fully intercalated and deintercalated states. We propose a theoretical scheme in which the reaction barrier that arises from lattice mismatches can be evaluated by using a simple energetic consideration, suggesting that the presence of intermediate phases is beneficial for cell kinetics by buffering the differences in lattice parameters between initial and final phases. We expect these insights into the role of intermediate phases found for VODP hold in general and thus provide a helpful guideline in the further understanding and design of battery materials.cathode | single voltage | atomic reorganization | ab initio calculation S odium ion batteries (SIBs) provide advantages of unlimited resource, low material cost, and easy worldwide accessibility that could make them the material of choice for grid-scale energy storage systems (1, 2). Unfortunately, the electrochemical performance of current SIBs remains inferior to that of lithium ion batteries (LIBs). In particular, we require SIB cathode materials that give a long cycle life with large capacities and high voltages under fast operating conditions, comparable to the Li counterparts.Numerous layered Na x MO 2 [M = Co, Mn, Fe, Ni, Cr, and multicomponent transition metals (TMs)] have been intensively studied as candidate SIB cathodes because such layer-structured materials typically exhibit higher capacities than other classes of materials (3-10). However, they suffer from a substantial capacity decay with cycling, owing to crystal structure collapse and/or unstable electrode-electrolyte interfaces (10). For more stable host frameworks, various polyanion structures have also been studied as SIB cathodes as a natural extension of the success shown in the LIB materials of the same classes, including TM fluorophosphates (11-15), pyrophosphates (16-18) and phosphates (19)(20)(21)(22). However, most of these materials still exhibited insufficient cycle lifetimes and large voltage steps that limit their practical capacity. The Prussian blue family has also been extensively investigated for both organic (23, 24) and aqueous electrolytes (25) owing to its unique advantages related to low material cost, low temperature synthesis, and decent electrochemical performance from well-developed ionic channel structures. However, the as-syn...

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“…During the past two decades, a number of phosphates belonging to the systems A O-M O -P O (A"Li, Na and M"Al, Ga, Cr, Fe) were shown to exhibit fast A> ion transport properties: among them are the Nasicon-type monophosphates A Cr (PO ) and A Fe (PO ) (1)(2)(3)(4), the monoclinic -Fe (SO ) -type modification of Li Cr (PO ) and Li Fe (PO ) (2,(5)(6)(7), the monodiphosphates Na (MP O ) PO (8), and the diphosphates Na M (P O ) (9,10). All these compounds have a 3D framework made up of corner-sharing MO octahedra and PO tetrahedra, with the A> ions located in the interstitial space.…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure and Cation Transport Properties of the Layered Monodiphosphates: Li9M3(P2O7)3(PO4)2(M=Al, Ga, Cr, Fe)

Poisson¹,

d'Yvoire²,

Nguyen-Huy-Dung³

et al. 1998

Journal of Solid State Chemistry

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Crystal structure and cation transport properties of the ortho - diphosphates Na7(MP2O7)4PO4 (M = Al, Cr, Fe)

Cited by 48 publications

References 10 publications

The effect of Fe 2 O 3 substitution for Al 2 O 3 on the phase composition and structure of sodium–aluminum–iron phosphate glasses

The effect of Fe 2 O 3 substitution for Al 2 O 3 on the phase composition and structure of sodium–aluminum–iron phosphate glasses

Role of intermediate phase for stable cycling of Na ₇ V ₄ (P ₂ O ₇ ) ₄ PO ₄ in sodium ion battery

Crystal Structure and Cation Transport Properties of the Layered Monodiphosphates: Li9M3(P2O7)3(PO4)2(M=Al, Ga, Cr, Fe)

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Crystal structure and cation transport properties of the ortho - diphosphates Na7(MP2O7)4PO4 (M = Al, Cr, Fe)

Cited by 48 publications

References 10 publications

The effect of Fe 2 O 3 substitution for Al 2 O 3 on the phase composition and structure of sodium–aluminum–iron phosphate glasses

The effect of Fe 2 O 3 substitution for Al 2 O 3 on the phase composition and structure of sodium–aluminum–iron phosphate glasses

Role of intermediate phase for stable cycling of Na 7 V 4 (P 2 O 7 ) 4 PO 4 in sodium ion battery

Crystal Structure and Cation Transport Properties of the Layered Monodiphosphates: Li9M3(P2O7)3(PO4)2(M=Al, Ga, Cr, Fe)

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Role of intermediate phase for stable cycling of Na ₇ V ₄ (P ₂ O ₇ ) ₄ PO ₄ in sodium ion battery