Effects of oxidation on structure and performance of LiVPO4F as cathode material for lithium-ion batteries

Ma, Rui; Shao, Lianyi; Wu, Kaiqiang; Shui, Miao; Wang, Dongjie; Long, Nengbing; Ren, Yuanlong; Shu, Jie

doi:10.1016/j.jpowsour.2013.10.029

Cited by 37 publications

(25 citation statements)

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“…Indeed, the most efficient Tavorite compound, LiVPO 4 F, is characterized by a theoretical energy density of 655Wh/kg (against 586Wh/kg for LiFePO 4 ). LiVPO 4 F was synthetized for the first time ten years ago 22 , and exhibits very good electrochemical performances even at high rates 23,24,25 as well as good chemical stability in air, in moisture and in temperature in the charged state of the battery [26][27][28] . The lithium extraction process from LiV III PO 4 F occurs following two successive biphasic reactions involving the V 4+ /V 3+ redox couple, the first one between LiVPO 4 F and Li 2/3 VPO 4 F at 4.24V vs.…”

Section: Introductionmentioning

confidence: 99%

Structural and electrochemical studies of a new Tavorite composition: LiVPO₄OH

et al. 2016

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Polyanionic materials attract a strong interest in the field of Li-ion battery research thanks to the wide range of compositions, structures and electrochemical properties they offer. Tavorite-type compositions offer a very rich crystal chemistry, among which LiVPO 4 F has the highest theoretical energy density (i.e. 655 Wh/kg). A new Tavorite-type LiVPO 4 OH composition was synthetized by hydrothermal route from three different vanadiumcontaining precursors. The crystal structure of this new phase was fully determined thanks to synchrotron X-ray and neutron diffraction. 1 H, 7 Li, and 31 P magic angle spinning nuclear magnetic resonance spectroscopy as well as diffuse reflectance infra-red spectroscopy were performed in order to support further the nature of the phases formed. Galvanostatic intermittent titration technique experiments in Lithium batteries and ex-situ X-ray diffraction analyses revealed that during oxidation, the concomitant extraction of Li + and H + occurs at the same equilibrium potential (3.95V vs Li + /Li) and leads to the formation of the Tavorite phase VPO 4 O at the end of the charge. LiVPO 4 OH is also electrochemically active in the low voltage region, upon Li + insertion. The reversible insertion/extraction of lithium at 1.35V vs Li + /Li leads to the formation of Li 2 VPO 4 OH at the end of discharge.

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Section: Introductionmentioning

confidence: 99%

Structural and electrochemical studies of a new Tavorite composition: LiVPO₄OH

et al. 2016

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“…The diffraction peak at 27.01 gradually decreases upon initial delithiation but shows a slight increase with about 0.5 Li per formula delithiation. This phenomenon is regarded as the appearance of new intermediate phase, [1,30]. Therefore, the delithiation process of LiVPO 4 F is related to two two-phase transitions in the potential range of 3.0-4.7 V. In contrast, no intermediate phase can be detected during the lithiation process.…”

Section: Resultsmentioning

confidence: 99%

“…Secondly, the resulting VPO 4 was mixed with the lithium fluoride (LiF, 98.5%) by planetary ballmilling and then calcined in Ar-filled tube furnace to form the final LiVPO 4 F sample. Detailed synthetic steps of LiVPO 4 F were also reported in our previous paper [1,21,22,25,26].…”

Section: Methodsmentioning

confidence: 99%

“…Nowadays, the demand of large-scale energy storage batteries has a rapid increment in power electric and hybrid electric vehicles, energy-efficient cargo ships and locomotives with the quick development of society [1]. However, the development of lithium-ion batteries is restricted to the finding of new cathode candidates to replace traditional LiCoO 2 .…”

Section: Introductionmentioning

confidence: 99%

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Carbothermal synthesis of LiVPO4F and its structural change in a broad potential range observed by in-situ X-ray diffraction

Wang

Lin

et al. 2015

Ceramics International

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“…Inorganic carbon, such as acetylene black,,, and high surface area carbon, are not only used as reducing agent but also conductive carbon in CTR method. The coating of multi‐walled carbon nanotube with exceptional conductive and mechanical at low content can form a conductive network .…”

Section: Introductionmentioning

confidence: 99%

Improving the Electrochemical Performances of LiVPO₄F/C Cathode by Doping AlF₃ with Dual Functions for Lithium Ion Batteries

Wen

Fan

et al. 2018

Energy Tech

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The performances of pure phase LiVPO4F/C is poor. AlF3 is selected to dope it, which is synthesized by a novel chemical reduction. Alveolate structure is discovered in undoped sample because of the volatilization of fluoride. The selected area electron diffraction proves that it is composed of Li3V2(PO4)3 and LiVPO4F. However, the alveolate disappears in doped sample with pure parallelogram pattern because AlF3 supplements the loss of fluorine. Doping of Al3+ decreases the lattice parameters and stabilizes the crystallite. Therefore, the performances of LiV1‐xAlxPO4F/C at different temperatures are significantly improved. LiV0.97Al0.03PO4F/C delivers high capacity of 116.6 mAh g−1 and excellent capacity retention of 96.83 % at 5 C after 50 cycles. The 5 C capacities at −10 °C and 55 °C are 90.1 mAh g−1 and 121.4 mAh g−1. Ex‐situ X‐ray diffraction reveals that the lattice of LiV0.97Al0.03PO4F/C can maintain stability after extreme testing conditions. These are ascribed to the improvement in intrinsic conductivity and diffuse coefficient. It implies that AlF3 plays dual functions in the doping process.

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Effects of oxidation on structure and performance of LiVPO4F as cathode material for lithium-ion batteries

Cited by 37 publications

References 44 publications

Structural and electrochemical studies of a new Tavorite composition: LiVPO₄OH

Structural and electrochemical studies of a new Tavorite composition: LiVPO₄OH

Carbothermal synthesis of LiVPO4F and its structural change in a broad potential range observed by in-situ X-ray diffraction

Improving the Electrochemical Performances of LiVPO₄F/C Cathode by Doping AlF₃ with Dual Functions for Lithium Ion Batteries

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Effects of oxidation on structure and performance of LiVPO4F as cathode material for lithium-ion batteries

Cited by 37 publications

References 44 publications

Structural and electrochemical studies of a new Tavorite composition: LiVPO4OH

Structural and electrochemical studies of a new Tavorite composition: LiVPO4OH

Carbothermal synthesis of LiVPO4F and its structural change in a broad potential range observed by in-situ X-ray diffraction

Improving the Electrochemical Performances of LiVPO4F/C Cathode by Doping AlF3 with Dual Functions for Lithium Ion Batteries

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Product

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Structural and electrochemical studies of a new Tavorite composition: LiVPO₄OH

Structural and electrochemical studies of a new Tavorite composition: LiVPO₄OH

Improving the Electrochemical Performances of LiVPO₄F/C Cathode by Doping AlF₃ with Dual Functions for Lithium Ion Batteries