Polyanionic Compounds as Cathode Materials

Julien, C.; Mauger, A.; Vijh, Ashok K.; Zaghib, Karim

doi:10.1007/978-3-319-19108-9_7

Cited by 3 publications

(2 citation statements)

References 247 publications

(368 reference statements)

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“…Additionally, as observed after the discharging to 1.0 V vs. Li + /Li, the asymmetry in the Cu current collector reflections was also observed in the diffraction profiles for the electrodes at the selected states of charge (Figure S11). Since the poorly crystalline Li 3 PO 4 phase is known to be electrochemically inactive (reaction 5) [69], it is assumed that only the metallic species (Ni and/or Mg alloys) are electrochemically active in the charge reaction. The electrochemical cycling of the MNP active material was assessed in a Li-half cell configuration to support this assumption (Figure S12).…”

Section: The Electrochemical Activity Of Mnp With LI + Ionsmentioning

confidence: 99%

A Comparative Mechanistic Study on the Intercalation Reactions of Mg2+ and Li+ Ions into (Mg0.5Ni0.5)3(PO4)2

et al. 2023

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Magnesium-ion batteries represent promising environmentally sustainable energy-storage systems with higher energy densities than their lithium counterparts. In this work, the charge storage mechanisms of the olivine-related compound (Mg0.5Ni0.5)3(PO4)2 using Mg2+ and Li+ ions were investigated and compared for the first time when copper was chosen as the current collector. A comprehensive physicochemical and electrochemical characterization was performed on the pristine powder and electrodes at different states of charge. Although (Mg0.5Ni0.5)3(PO4)2 is electrochemically active, it undergoes irreversible conversion reactions in both Mg and Li chemistries. The conversion reactions proceed with an ionic exchange between structural Ni2+ and Mg2+ or Li+ cations, which results in the formation of sarcopside-Mg3(PO4)2, a Cu–Ni alloy and poorly crystalline Li3PO4, respectively. A capacity of 600 mA h g−1 was achieved with a Li metal counter electrode in the Li cell since the conversion reaction could go to completion. A capacity of 92 mA h g−1 was delivered in the Mg cell using an activated carbon counter electrode. These findings shed light on the fundamental mechanism of activity in olivine-related compounds, underlining the importance of performing systematic studies to unveil the complex interactions between both single-valent and multivalent ions with novel structures.

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Section: The Electrochemical Activity Of Mnp With LI + Ionsmentioning

confidence: 99%

A Comparative Mechanistic Study on the Intercalation Reactions of Mg2+ and Li+ Ions into (Mg0.5Ni0.5)3(PO4)2

et al. 2023

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“…Another representative of this class, Tavorite compounds (LiMXO 4 Y), allows for adjustment of the working potential via using different transition metals as well as tuning the inductive effect of the polyanion and the bridging anion (ligand), i.e., O, F, and OH. Thus, the potential of the redox couple is highly influenced by the local environment of the transition metal. − Among the Tavorite compounds, vanadium-based phosphates LiVPO 4 O and LiVPO 4 F are the most appealing ones because of their attractive electrochemical properties. Indeed, the redox couple in LiVPO 4 O (V +4 /V +5 ) operates at 3.95 V, whereas in LiVPO 4 F the redox couple (V +3 /V +4 ) operates at 4.26 V vs Li. − Fluorinated compounds have been shown to possess better electrochemical performance as well as safety parameters.…”

Section: Introductionmentioning

confidence: 99%

Effects of a Mixed O/F Ligand in the Tavorite-Type LiVPO₄O Structure

et al. 2019

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We report the synthesis and detailed structural and chemical characterization including electrochemical properties of a lithium vanadium oxy/fluoro-phosphate material. To the best of our knowledge, we have for the first time synthesized a LiVPO 4 O-type phase with a mixed O/F ligand. In the synthesis procedure, the LiVPO 4 O precursor compound was fluorinated via LiF incorporation, with preservation of the LiVPO 4 O framework structure. The operating potential of the synthesized material is increased compared to that of the LiVPO 4 O precursor (4.12 V vs 3.95 V versus metallic lithium, respectively). The related increase in operating potential was assigned to the effect of the intermixing O/F ligand, which is attained via the successful fluorine incorporation into the LiVPO 4 O structure. A characterization of the investigated materials was performed using microscale-covering XRD, XANES, and NMR techniques as well as nanoscale spatially resolved imaging and analytical STEM techniques. The obtained oxy/fluoro-phosphate phase is isostructural to LiVPO 4 O; however, the presence of the mixed O/F ligand promoted a higher symmetry of vanadium octahedra. These variations of the vanadium local environment along with the observed inhomogeneous distribution of the incorporated fluorine gave rise to the minor local deviations in vanadium valence. Our results clearly emphasize the connection among the fluorine ligand incorporation, its local distribution, and the electrochemical properties of the material.

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Through the Maze of Multivalent‐Ion Batteries: A Critical Review on the Status of the Research on Cathode Materials for Mg²⁺ and Ca²⁺ Ions Insertion

Maroni

Dongmo

Gauckler

et al. 2021

Batteries & Supercaps

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This review aims to address the status of transition metal‐based cathode materials for Mg2+ and Ca2+‐based multivalent‐ion batteries on a critical standpoint, providing a comprehensive overview. Multivalent‐based ions battery (MIB) technologies are among the most promising post‐lithium electrochemical energy storage devices currently studied, but they still fall short in several aspects due to their early stage of research. In addition, difficult experimental conditions related to the electrolyte systems and the cathode materials require an additional quote of care when performing experiments. In this review, a global approach is undertaken, from an introduction to electrolytes to the studied insertion parameters that allow a fast (de)insertion of multivalent ions. Then, the currently studied structural classes of cathode materials and a critical comment on data reporting, which are among the focal points of the actual state‐of‐the‐art research, are thoroughly discussed.

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Polyanionic Compounds as Cathode Materials

Cited by 3 publications

References 247 publications

A Comparative Mechanistic Study on the Intercalation Reactions of Mg2+ and Li+ Ions into (Mg0.5Ni0.5)3(PO4)2

A Comparative Mechanistic Study on the Intercalation Reactions of Mg2+ and Li+ Ions into (Mg0.5Ni0.5)3(PO4)2

Effects of a Mixed O/F Ligand in the Tavorite-Type LiVPO₄O Structure

Through the Maze of Multivalent‐Ion Batteries: A Critical Review on the Status of the Research on Cathode Materials for Mg²⁺ and Ca²⁺ Ions Insertion

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Polyanionic Compounds as Cathode Materials

Cited by 3 publications

References 247 publications

A Comparative Mechanistic Study on the Intercalation Reactions of Mg2+ and Li+ Ions into (Mg0.5Ni0.5)3(PO4)2

A Comparative Mechanistic Study on the Intercalation Reactions of Mg2+ and Li+ Ions into (Mg0.5Ni0.5)3(PO4)2

Effects of a Mixed O/F Ligand in the Tavorite-Type LiVPO4O Structure

Through the Maze of Multivalent‐Ion Batteries: A Critical Review on the Status of the Research on Cathode Materials for Mg2+ and Ca2+ Ions Insertion

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Effects of a Mixed O/F Ligand in the Tavorite-Type LiVPO₄O Structure

Through the Maze of Multivalent‐Ion Batteries: A Critical Review on the Status of the Research on Cathode Materials for Mg²⁺ and Ca²⁺ Ions Insertion