Dataset Information

Investigation of the Inorganic Compounds NaMV₂(PO₄)₃ (M = Fe, Co, Ni) as Anode Materials for Sodium-Ion Batteries.

ABSTRACT: The new compounds NaMV₂(PO₄)₃ (M = Fe, Co, Ni) were synthesized via a sol-gel synthesis route, and their crystal structures were refined using the Rietveld method from X-ray powder diffraction data. NaCoV₂(PO₄)₃ was also characterized by TGA, cyclic voltammetry, and galvanostatic cycling. The three phases crystallize with the orthorhombic symmetry and the space group Imma. The structures are isotypic to the stuffed ?-CrPO₄-type structure and contain two vacant sites in which two sodium atoms can be intercalated. When NaCoV₂(PO₄)₃ is cycled at a 1C rate in the voltage ranges of 0.1-3 and 0.7-3 V vs Na⁺/Na, it delivers specific capacities of 190 and 75 mA h/g, respectively, with an average operation potential of ?1.4 V. This attests to the electrochemical activity of this compound and indicates that the ?-CrPO₄-type compounds could be suitable for hosting other guest ions.

SUBMITTER: Alkhateeb A

PROVIDER: S-EPMC7726745 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

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Investigation of the Inorganic Compounds NaMV2(PO4)3 (M = Fe, Co, Ni) as Anode Materials for Sodium-Ion Batteries.

Alkhateeb Alaa A Ben Yahia Hamdi H

ACS omega 20201119 48

The new compounds NaMV2(PO4)3 (M = Fe, Co, Ni) were synthesized via a sol-gel synthesis route, and their crystal structures were refined using the Rietveld method from X-ray powder diffraction data. NaCoV2(PO4)3 was also characterized by TGA, cyclic voltammetry, and galvanostatic cycling. The three phases crystallize with the orthorhombic symmetry and the space group Imma. The structures are isotypic to the stuffed α-CrPO<s ...[more]

PMID: 33324789

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Project description:Conversion reaction materials (transition metal oxides, sulfides, phosphides, etc.) are attractive in the field of lithium-ion batteries because of their high theoretical capacity and low cost. However, the realization of these materials in lithium-ion batteries is impeded by large voltage hysteresis, high polarization, inferior cycle stability, rate capability, irreversible capacity loss in first cycling, and dramatic volume change during redox reactions. One method to overcome these problems is the introduction of amorphous materials. This work introduces a facile method to synthesize amorphous and crystalline dinickel phosphide (Ni2P) nanoparticle clusters with identical morphology and presents a direct comparison of the two materials as anode materials for rechargeable lithium-ion batteries. To assess the effect of crystallinity and hierarchical structure of nanomaterials, it is crucial to conserve other factors including size, morphology, and ligand of nanoparticles. Although it is rarely studied about synthetic methods of well-controlled Ni2P nanomaterials to meet the above criteria, we synthesized amorphous, crystalline Ni2P, and self-assembled Ni2P nanoparticle clusters via thermal decomposition of nickel-surfactant complex. Interestingly, simple modulation of the quantity of nickel acetylacetonate produced amorphous, crystalline, and self-assembled Ni2P nanoparticles. A 0.357 M nickel-trioctylphosphine (TOP) solution leads to a reaction temperature limitation (∼315 °C) by the nickel precursor, and crystalline Ni2P (c-Ni2P) nanoparticles clusters are generated. On the contrary, a lower concentration (0.1 M) does not accompany a temperature limitation and hence high reaction temperature (330 °C) can be exploited for the self-assembly of Ni2P (s-Ni2P) nanoparticle clusters. Amorphous Ni2P (a-Ni2P) nanoparticle clusters are generated with a high concentration (0.714 M) of nickel-TOP solution and a temperature limitation (∼290 °C). The a-Ni2P nanoparticle cluster electrode exhibits higher capacities and Coulombic efficiency than the electrode based on c-Ni2P nanoparticle clusters. In addition, the amorphous structure of Ni2P can reduce irreversible capacity and voltage hysteresis upon cycling. The amorphous morphology of Ni2P also improves the rate capability, resulting in superior performance to those of c-Ni2P nanoparticle clusters in terms of electrode performance.

Dataset Information

Investigation of the Inorganic Compounds NaMV₂(PO₄)₃ (M = Fe, Co, Ni) as Anode Materials for Sodium-Ion Batteries.

Publications

Investigation of the Inorganic Compounds NaMV<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> (M = Fe, Co, Ni) as Anode Materials for Sodium-Ion Batteries.

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