Effects of Ti and Mg Codoping on the Electrochemical Performance of Li3V2(PO4)3 Cathode Material for Lithium Ion Batteries

Deng, Chao; Zhang, S.; Yang, Shuo; Gao, Yunfang; Bo, Wu; Ma, Li; Fu, Bo; Wu, Qigang; Liu, F. L.

doi:10.1021/jp201686g

Cited by 113 publications

(72 citation statements)

References 22 publications

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“…A considerable number of articles are devoted to issues of ion transport in Li 3 V 2 (PO 4 ) 3 electrode [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25], which engage for this purpose impedance spectroscopy method. However, the analysis of impedance data in these studies is quite superficial.…”

Section: Introductionmentioning

confidence: 99%

Lithium diffusion in Li3V2(PO4)3-based electrodes: a joint analysis of electrochemical impedance, cyclic voltammetry, pulse chronoamperometry, and chronopotentiometry data

Ivanishchev

Чуриков

Ivanishcheva

et al. 2015

Ionics

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In order to establish the mechanism and to determine the parameters of lithium transport in electrodes based on lithium-vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ), the kinetic model was designed and experimentally tested for joint analysis of electrochemical impedance (EIS), cyclic voltammetry ( C V ) , p u l s e c h r o n o a m p e r o m e t r y ( P I T T ) , a n d chronopotentiometry (GITT) data. It comprises the stages of sequential lithium-ion transfer in the surface layer and the bulk of electrode material's particles, including accumulation of lithium in the bulk. Transfer processes at both sites are of diffusion nature and differ significantly, both by temporal (characteristic time, τ) and kinetic (diffusion coefficient, D) constants. PITT data analysis provided the following D values for the predominantly lithiated and delithiated forms of the intercalation material: 10 −9 and 3 × 10 −10 cm 2 s −1 , respectively, for transfer in the bulk and 10 −12 cm 2 s −1 for transfer in the thin surface layer of material's particles. D values extracted from GITT data are in consistency with those obtained from PITT: 3.5-5.8 × 10 −10 and 0.9-5 × 10 −10 cm 2 s −1 (for the current and currentless mode, respectively). The D values obtained from EIS data were 5.5 × 10 −10 cm 2 s −1 for lithiated (at a potential of 3.5 V) and 2.3 × 10 −9 cm 2 s −1 for delithiated (at a potential 4.1 V) forms. CV evaluation gave close results: 3 × 10 −11 cm 2 s −1 for anodic and 3.4 × 10 −11 cm 2 s −1 for cathodic processes, respectively. The use of complex experimental measurement procedure for combined application of the EIS, PITT, and GITT methods allowed to obtain thermodynamic E,c dependence of Li 3 V 2 (PO 4 ) 3 electrode, which is not affected by polarization and heterogeneity of lithium concentration in the intercalate.

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Section: Introductionmentioning

confidence: 99%

Lithium diffusion in Li3V2(PO4)3-based electrodes: a joint analysis of electrochemical impedance, cyclic voltammetry, pulse chronoamperometry, and chronopotentiometry data

Ivanishchev

Чуриков

Ivanishcheva

et al. 2015

Ionics

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“…However, it is difficult to bring out the proper performance of Li 3 V 2 (PO 4 ) 3 because of its low electronic conductivity with the order of 10 ¹7 S cm ¹1 . 3,4 Our group has so far prepared the Li 3¹2x (V 1¹x Zr x ) 2 -(PO 4 ) 3 materials (0¯x¯0.2) by a solid state reaction and also showed that monoclinic Li 3 V 2 (PO 4 ) 3 is stabilized by substituting Zr for V sites; Li 3 V 2 (PO 4 ) 3 changed from ¡-phase to ¢-phase at about 120°C and from ¢-phase to £-phase at about 180°C. 5 Furthermore, the Li 3¹2x (V 1¹x Zr x ) 2 (PO 4 ) 3 materials have been reported to indicate a high charge/discharge performance.…”

Section: Introductionmentioning

confidence: 99%

Improvement of High Rate Performances for Ti-Doped Li3V2(PO4)3 Cathode Materials

et al. 2015

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Ti-doped lithium vanadium(III) phosphate cathode materials, Li 3−2x (V 1−x Ti x ) 2 (PO 4 ) 3 , were prepared by a solid state reaction. The Ti-doped samples exhibited that the γ-phase is stabilized at room temperature by substituting Ti for V sites at more than x = 0.10. The discharge capacity of the doped samples at a 60 C rate was found to be much higher than that for the non doped sample. This improved performance found for the doped cathodes was attributed to the increase in ionic conductivity given by the transition of α-to γ-phase via Ti substitution.

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“…Despite the fact that several metallic ion-doped Li 3 M x V 2Àx (PO 4 ) 3 /C (M = Cr 3+ , Mn 2+ , Mg 2+ , Al 3+ , Na + , etc.) [8][9][10][11][12] have been studied, the electrochemical performance of the nominal Li 3 M x V 2Àx (PO 4 ) 3 /C has not reached a satisfactory level. In this paper, Nd 3+ is selected to dope into Li 3 V 2 (PO 4 ) 3 , and Li 3 Nd x V 2Àx (PO 4 ) 3 , which has good electrochemical performance in high discharge rate and long cycle, is synthesized.…”

Section: Introductionmentioning

confidence: 99%

Nd3+-doped Li3V2(PO4)3 cathode material with high rate capability for Li-ion batteries

Li¹,

Zhou²,

Chen³

et al. 2015

Chinese Chemical Letters

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Effects of Ti and Mg Codoping on the Electrochemical Performance of Li₃V₂(PO₄)₃ Cathode Material for Lithium Ion Batteries

Cited by 113 publications

References 22 publications

Lithium diffusion in Li3V2(PO4)3-based electrodes: a joint analysis of electrochemical impedance, cyclic voltammetry, pulse chronoamperometry, and chronopotentiometry data

Lithium diffusion in Li3V2(PO4)3-based electrodes: a joint analysis of electrochemical impedance, cyclic voltammetry, pulse chronoamperometry, and chronopotentiometry data

Improvement of High Rate Performances for Ti-Doped Li<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> Cathode Materials

Nd3+-doped Li3V2(PO4)3 cathode material with high rate capability for Li-ion batteries

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