Sol–gel synthesis of Li2CoPO4F/C nanocomposite as a high power cathode material for lithium ion batteries

Wu, Xiaobiao; Gong, Zhengliang; Shi, Tan; Yang, Yong

doi:10.1016/j.jpowsour.2012.07.099

Cited by 42 publications

(41 citation statements)

References 23 publications

(33 reference statements)

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“…• C are given in literature to obtain Li 2 CoPO 4 F. [5][6][7][8][9] To get a better insight into the conversion temperature of our precursor powder STA measurements have been performed. In Figure 3 the TGA and DTA curves from 25 -700…”

Section: Resultsmentioning

confidence: 99%

A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material

Schoiber

Berger

Yada

et al. 2015

J. Electrochem. Soc.

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Li 2 CoPO 4 F has been synthesized via a novel two-step reaction from a solvothermally prepared precursor mixture of LiCoPO 4 and LiF. Solvent influences were monitored by powder X-ray diffraction and the reaction conditions for the conversion of the precursor mixture to Li 2 CoPO 4 F were optimized. In addition, the obtained materials were characterized before and after carbon-coating by SEM, N 2 sorption, elemental and thermogravimetric analysis. The electrochemical performance of the products as high-voltage cathode materials in a coin-cell was tested, and long term stability over 50 charge/discharge cycles could be demonstrated.

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Section: Resultsmentioning

confidence: 99%

A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material

Schoiber

Berger

Yada

et al. 2015

J. Electrochem. Soc.

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“…In the last years, many attempts have been made to increase further the energy density of LIBs and cathode materials operating above 4.5 V versus Li/Li + have been proposed in the late 90's, such as LiNi0.5Mn1.5O4 [10,11], LiCoPO4 [12,13] or, more recently, LiCoPO4F [14,15]. However, the so-called '5 V'…”

Section: Introductionmentioning

confidence: 99%

Towards practical sulfolane based electrolytes: Choice of Li salt for graphite electrode operation

Zhang

Porcher

Paillard

2018

Journal of Power Sources

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Abstract:Sulfolane (tetramethylene sulfone, SL) is known for leading to Li-ion electrolytes with high anodic stability. However, the operation of graphite electrodes in alternative electrolytes is usually challenging, especially when ethylene carbonate (EC) is not used as co-solvent. Thus, we study here the influence of the lithium salt on the physico-chemical and electrochemical properties of EC-free SL-based electrolytes and on the performance of graphite electrodes based on carboxymethyl cellulose (CMC). SL mixed with dimethyl carbonate (DMC) leads to electrolytes as conductive as state-of-theart alkyl carbonate-based electrolytes with wide electrochemical stability windows. The compatibility with graphite electrodes depends on the Li salt used and, even though cycling is possible with most salts, lithium difluoro-oxalato borate (LiDFOB) is especially interesting for graphite operation.LiDFOB electrolytes are conductive at room temperature (ca. 6 mS cm -1 ) with an anodic stability slightly below 5 V vs. Li/Li + on particulate carbon black electrodes. In addition, it allows cycling graphite electrodes with steady capacity and high coulombic efficiency without any additive. The testing of graphite electrodes in half-cells is, however, problematic with SL:DMC mixtures and, by switching the Li metal counter electrode for LiFePO4, the graphite electrode achieves better practical performance in terms of rate capability.

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“…More recently, Ellis et al [40] and Plashnitsa et al [65] and have utilized LiVPO 4 F as both cathode and anode for fabrication of a symmetric Li-ion LiVPO 4 F//LiVPO 4 F cell with a nonflammable ionic liquid LiBF 4 -EMIBF 4 electrolyte. This symmetrical cell displays a potential window of 2.4 V with a reversible specific capacity of 130 mAh g À1 and has shown to be stable and safe at high temperature up to 80 C. The incorporation of aluminum into the LiV 1Ày Al y PO 4 F framework prepared by the two-step carbothermal reduction method has generated some interesting properties: (1) an almost linear decrease of the discharge capacity on the V 3+/4+ redox couple with Al substitution, (2) a lower polarizability, (3) a gradual upshift in the V 3+/4+ redox peak of 90 mV, and (4) the ratio of the two charge plateaus remains relatively constant for 0 y 0.25 [59]. [68].…”

Section: Livpo 4 Fmentioning

confidence: 99%

Fluoro-polyanionic Compounds

et al. 2016

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During the last decade, numerous studies have been devoted to replace oxides by materials with a polyanion-based framework that are considered as safe alternatives for the traditional oxide electrodes [1] [8,9] have all been considered as thermally stable. All these materials usually exhibit excellent stability on longterm cycling by comparison to lithium metal oxides and essentially no release of oxygen from the lattice or reactivity with the electrolyte. However, the materials were found to be poor electronic conductors [3].The search of new cathode materials aiming to maintain a good mix of properties, with focus on electrochemical and safety parameters, has resulted in the improvement of the electrochemical performance using two strategies: (1) substitution of fluorine for oxygen or (2) fluorine coating of the active particles. As a result, fluorinated compounds display several advantages such as high voltage redox reactions, stabilization of the host lattice, protection the electrode particle surface from HF attack and electrolyte decomposition that impedes a side reaction, and easy transport of mobile Li + ions [10][11][12][13][14][15]. Accordingly, anion substitution is expected as an effective way to enhance the electrochemical performance of spinel and layered compounds, especially for NMC materials [16] due to the strong electronegativity of the F À anion, which will make the structure more stable. Among the metal fluorides as surface fluorination (coating) [20]. While these materials are treated in the first and third chapters, attention hereunder is focussed on technological developments of fluorophosphates and fluorosulfates [21][22][23]. The present chapter gives the state of the art in the understanding of the properties of these F-containing materials. Owing to the progress in

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Sol–gel synthesis of Li2CoPO4F/C nanocomposite as a high power cathode material for lithium ion batteries

Cited by 42 publications

References 23 publications

A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material

A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material

Towards practical sulfolane based electrolytes: Choice of Li salt for graphite electrode operation

Fluoro-polyanionic Compounds

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Sol–gel synthesis of Li2CoPO4F/C nanocomposite as a high power cathode material for lithium ion batteries

Cited by 42 publications

References 23 publications

A Two-Step Synthesis for Li2CoPO4F as High-Voltage Cathode Material

A Two-Step Synthesis for Li2CoPO4F as High-Voltage Cathode Material

Towards practical sulfolane based electrolytes: Choice of Li salt for graphite electrode operation

Fluoro-polyanionic Compounds

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A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material

A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material