Hollow α-LiVOPO4 sphere cathodes for high energy Li-ion battery application

Kuppan, Saravanan; Lee, Hwang Sheng; Kuezma, Mirjana; Vittal, Jagadese J.; Balaya, Palani

doi:10.1039/c0jm04428h

Cited by 55 publications

(43 citation statements)

References 40 publications

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“…However, phosphate group materials have poor intrinsic electronic and ionic conductivity, which impedes the performance of lithium-ion batteries, particularly at high rates. [5][6][7][8][9][10][11][12][13] Cation doping is another effective way of modifying the intrinsic properties of electrode materials for lithium-ion batteries. [5][6][7] Lithium vanadyl phosphate (LiVOPO 4 ) is also considered a high energy density cathode material because of its theoretical capacity of 166 mAh/g and relative higher lithium intercalation potential of 3.9 V. Among the seven different phases of LiVOPO 4 , triclinic α-LiVOPO 4 and orthorhombic β-LiVOPO 4 have been studied widely because they exhibit electrochemical activation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ti Doping on the Structural Stability and Enhanced Electrochemical Performance of α‐LiVOPO₄

Lee

Ryu

2018

Bulletin Korean Chem Soc

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Lithium vanadyl phosphate has seven different crystallographic phases. Among them, α-LiVOPO 4 is chosen because of its relatively high energy density and redox voltage of 3.9 V compared to the other phosphates. In this study, Ti 4+ -doped α-LiV 1−x Ti x OPO 4 (x = 0.00, 0.003, 0.005, 0.007, and 0.01) was prepared using a sol-gel method to increase the structure stability and electrochemical performance. The triclinic structure with the space group P-1 was confirmed by X-ray diffraction, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Inductively coupled plasma-optical emission spectroscopy was conducted to determine the precise state. The shape and size of the particles were observed by field-emission scanning electron microscopy. In situ X-ray absorption spectroscopy was performed to confirm the structural behavior during the electrochemical reaction. Electrochemical measurements such as cyclic voltammetry and galvanostatic charge-discharge were conducted. α-LiV 1−x Ti x OPO 4 (x = 0.003, 0.005, 0.007, and 0.01) showed structural stability during cycling as well as decreased polarization during charge and discharge with the increased diffusion coefficient of lithium ions. α-LiV 0.995 Ti 0.005 OPO 4 showed the best cycling stability and rate capability among all the samples examined because Ti doping retained its site to prevent structural collapse.

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Section: Introductionmentioning

confidence: 99%

Effects of Ti Doping on the Structural Stability and Enhanced Electrochemical Performance of α‐LiVOPO₄

Lee

Ryu

2018

Bulletin Korean Chem Soc

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“…Equally, Li3V2(PO4)3, which has a high theoretical capacity of 197 mA h g -1 , could yield cells whose specific energies exceed 750 Wh kg -1 . Recently, Saravanan et al [490], prepared hollow sphere morphologies of α-LiVOPO4, a phase which is suggested to be more crystallographically favourable to Li + intercalation than its polymorph twin, β-LiVOPO4 [491]. The structure of α-LiVOPO4 may be described as columns of close-packed vanadium oxide octahedra, where the interstitial sites are filled alternatively by P and Li atoms.…”

Section: Other Transition Metal Phosphates (Limpo4)mentioning

confidence: 99%

Evaluating the performance of nanostructured materials as lithium-ion battery electrodes

et al. 2013

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Access to the full text of the published version may require a subscription. Rights © Tsinghua University Press and Springer-Verlag Berlin ABSTRACTThe performance of the lithium-ion cell is heavily dependent on the ability of the host electrodes to accommodate and release Li + ions from the local structure. While the choice of electrode materials may define parameters such as cell potential and capacity, the process of intercalation may be physically limited by the rate of solid-state Li + diffusion. Increased diffusion rates in lithium-ion electrodes may be achieved through a reduction in the diffusion path, accomplished by a scaling of the respective electrode dimensions.In addition, some electrodes may undergo large volume changes associated with charging and discharging, the strain of which, may be better accommodated through nanostructuring. Failure of the host to accommodate such volume changes may lead to pulverisation of the local structure and a rapid loss of capacity. In this review article, we seek to highlight a number of significant gains in the development of nanostructured lithium-ion battery architectures (both anode and cathode), as drivers of potential next-generation electrochemical energy storage devices.

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“…The higher redox potential (4 V) of LiVOPO 4 blended with its good theoretical capacity of 159 mAh/g makes its energy density (more than 620 Wh/kg) higher than that of LiFePO 4 and projects to be a potential high-voltage cathode material for lithium-ion batteries [1][2][3][4][5][6]. LiVOPO 4 has different crystallographic phases such as tetragonal α-LiVOPO 4 [7,8] and orthorhombic β-LiVOPO 4 [6,[9][10][11], and it has been reported that β-LiVOPO 4 exhibits excellent electrochemical performances as lithium-ion batteries [6].…”

Section: Introductionmentioning

confidence: 99%

Enhanced electrochemical performance of manganese-doped β-LiVOPO4 cathode materials for lithium-ion batteries

Xiong

Wang

et al. 2015

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LiV 1-x Mn x OPO 4 (0 ≤ x ≤ 0.2) cathode materials have been first synthesized by substituting V 4+ in β-LiVOPO 4 with Mn 4+ ion using a common solid-state method. Effects of Mn doping on the structures, morphology, and electrochemical properties of β-LiVOPO 4 were investigated by Xray diffraction (XRD), scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS), and various electrochemical methods such as galvanostatic charge-discharge tests, cyclic voltammograms (CV), and electrochemistry impedance spectroscopy (EIS) as well. Of the compositions investigated, the LiV 0.96 Mn 0.04 OPO 4 materials present the best electrochemical characteristics with the first discharge capacity of 150.0 and 148.7 mAh/g kept after 30 cycles at 0.2 C, while the value for β-LiVOPO 4 is only 135.5 and 123.6 mAh/g, respectively. It is clearly demonstrated that the improvement in electrochemical properties of β-LiVOPO 4 may be a result from the reduced charge transfer resistance, the increased lithium-ion diffusion, and phase conversion due to Mn doping.

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Hollow α-LiVOPO4 sphere cathodes for high energy Li-ion battery application

Cited by 55 publications

References 40 publications

Effects of Ti Doping on the Structural Stability and Enhanced Electrochemical Performance of α‐LiVOPO₄

Effects of Ti Doping on the Structural Stability and Enhanced Electrochemical Performance of α‐LiVOPO₄

Evaluating the performance of nanostructured materials as lithium-ion battery electrodes

Enhanced electrochemical performance of manganese-doped β-LiVOPO4 cathode materials for lithium-ion batteries

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Hollow α-LiVOPO4 sphere cathodes for high energy Li-ion battery application

Cited by 55 publications

References 40 publications

Effects of Ti Doping on the Structural Stability and Enhanced Electrochemical Performance of α‐LiVOPO4

Effects of Ti Doping on the Structural Stability and Enhanced Electrochemical Performance of α‐LiVOPO4

Evaluating the performance of nanostructured materials as lithium-ion battery electrodes

Enhanced electrochemical performance of manganese-doped β-LiVOPO4 cathode materials for lithium-ion batteries

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Effects of Ti Doping on the Structural Stability and Enhanced Electrochemical Performance of α‐LiVOPO₄

Effects of Ti Doping on the Structural Stability and Enhanced Electrochemical Performance of α‐LiVOPO₄